1
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Khanam SJ, Konda SR, Ketavath R, Fu W, Li W, Murali B. Enhanced Higher Harmonic Generation in Modified MAPbBr 3-xCl x Single Crystal by Additive Engineering. J Phys Chem Lett 2023; 14:9222-9229. [PMID: 37812013 DOI: 10.1021/acs.jpclett.3c02454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Mixed-halide perovskite materials (MHSCs) hold significant interest in photonics applications owing to their inherent advantages, including tunable bandgap properties, remarkable defect tolerance characteristics, and facile processability. These attributes position MHSCs as up-and-coming materials for various applications. However, the commercialization of these materials is severely affected by external factors, such as humidity and oxygen. The current work studies change in higher harmonics generation (HHG) in MAPbBr3-xClx single crystals (MHSC) with changing nitrogen-based additives. These additives act as a passivating layer and improve the nanolevel crystallinity. The additive engineering strategy impacts morphological and optical properties, depending on the additive's interaction.
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Affiliation(s)
- Sarvani Jowhar Khanam
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500046, Telangana, India
| | - Srinivasa Rao Konda
- The GPL Photonics Laboratory State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
| | - Ravi Ketavath
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500046, Telangana, India
| | - Wufeng Fu
- The GPL Photonics Laboratory State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
| | - Wei Li
- The GPL Photonics Laboratory State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
| | - Banavoth Murali
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500046, Telangana, India
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2
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Khanam SJ, Konda SR, Li W, Murali B. Aromatic Additives Boost the Terahertz Properties of Mixed Halide Perovskite Single Crystals. J Phys Chem Lett 2023:5624-5632. [PMID: 37310362 DOI: 10.1021/acs.jpclett.3c00649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Mixed halide perovskite (MHP) materials are promising candidates for photonic applications, owing to their tunable bandgap and pronounced optoelectronic properties. However, phase segregation in these materials severely impacts their scalability. The additive engineering (AE) strategy in the growth of most perovskite crystals (PSCs) has proven more effective. Current work focused toward enhancing the stability of 6.67% Cl-doped methylammonium lead(II) bromide single crystals (MHSCs) using aromatic nitrogen-based additives. Modified MHSCs showed enhanced terahertz (THz) radiation transmission and reflection. Moreover, the evidence from powder X-ray diffraction (p-XRD), X-ray photoelectron spectroscopy (XPS), and THz transmission in modified MHSCs revealed the mitigated phase segregation in modified MHSCs.
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Affiliation(s)
- Sarvani Jowhar Khanam
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India
| | - Srinivasa Rao Konda
- The GPL Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, People's Republic of China
| | - Wei Li
- The GPL Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, People's Republic of China
| | - Banavoth Murali
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India
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3
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Sumukam RR, Kumar GS, Savu RN, Murali B. Strategic Compositional Engineering in Quasi-2D Ruddlesden-Popper Perovskites to Decipher Deep Blue Emission. J Phys Chem Lett 2023; 14:395-402. [PMID: 36622306 DOI: 10.1021/acs.jpclett.2c03359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Perovskites have achieved immense progression in optoelectronic device applications owing to their fascinating intrinsic properties. However, the integration of perovskites in lighting applications has been retarded due to the challenges involved in achieving their deep blue light-emitting diodes (LEDs). Unlike other color counterparts, obtaining a stable, defect-tolerant, and high-band gap perovskite material for deep blue emission is an arduous task. Moreover, the ambient stability and efficient charge injection in the device are bottlenecks for the established perovskite emissive materials. Among all the dimensional perovskite counterparts, quasi-two-dimensional perovskites (Q2DPes) with hydrophobic ligands can exhibit better stability, and also, facile tunability of the properties can overcome the associated challenges. In this paper, for the first time, we demonstrate Ruddlesden-Popper-based Q2DPes that are pure deep blue emissive in the 450 nm region, stable, and can facilitate decent charge injection in LEDs. We have also demonstrated systematic modulations in the properties of the material, concerning the organic cation concentration.
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Affiliation(s)
- Ranadeep Raj Sumukam
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Prof. C R Rao Road, Hyderabad500046, Telangana State, India
| | - Gundam Sandeep Kumar
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Prof. C R Rao Road, Hyderabad500046, Telangana State, India
| | - Ramu Naidu Savu
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Prof. C R Rao Road, Hyderabad500046, Telangana State, India
| | - Banavoth Murali
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Prof. C R Rao Road, Hyderabad500046, Telangana State, India
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4
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Gennari A, Jackisch C, McCutcheon S, Flood E, Murali B, Guillaume X, Will O, Shimizu C, Mokiou S. 70P Factors influencing patient treatment decisions in early breast cancer (eBC): Discrete choice experiment (DCE) findings. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.03.086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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5
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Amgoth C, Santhosh R, Malavath T, Singh A, Murali B, Tang G. Solvent‐Assisted [(Glycine)‐(MP‐SiO
2
NPs)] Aggregate for Drug Loading and Cancer Therapy. ChemistrySelect 2020. [DOI: 10.1002/slct.202001905] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chander Amgoth
- Department of Chemistry Zhejiang University Hangzhou 310028 China
| | | | - Tirupathi Malavath
- Department of Biochemistry and Molecular Biology Tel Aviv University Israel
| | - Avinash Singh
- Department of Humanities and Sciences MLR Institute of Technology Hyderabad 500043 India
| | - Banavoth Murali
- School of Chemistry University of Hyderabad Hyderabad 500046 India
| | - Guping Tang
- Department of Chemistry Zhejiang University Hangzhou 310028 China
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6
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Ketavath R, Katturi NK, Ghugal SG, Kolli HK, Swetha T, Soma VR, Murali B. Deciphering the Ultrafast Nonlinear Optical Properties and Dynamics of Pristine and Ni-Doped CsPbBr 3 Colloidal Two-Dimensional Nanocrystals. J Phys Chem Lett 2019; 10:5577-5584. [PMID: 31468971 DOI: 10.1021/acs.jpclett.9b02244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
While the unabated race persists in achieving record efficiencies in solar cells and other photonic/optoelectronic devices using lead halide perovskite absorbers, a comprehensive picture of the correlated third-order nonlinear optical (NLO) properties is yet to be established. The present study is aimed at deciphering the role of dopants in multiphoton absorption properties of intentionally engineered CsPbBr3 colloidal nanocrystals (NCs). The charge separation of the plasmon-semiconductor conduction band owing to the hot electron transfer at the interface was demystified using the dynamics of the bleached spectral data from femtosecond (fs) transient absorption spectroscopy with broadband capabilities. The NLO properties studied through the fs Z-scan technique revealed that Ni-doped CsPbBr3 NCs exhibited strong third-order NLO susceptibility of ∼10-10 esu. The exotic photophysical phenomena in these pristine and Ni-doped CsPbBr3 colloidal two-dimensional (2D) NCs reported herein are believed to provide the avenues to address the critical variables involved in the structural differences and their correlated optoelectronic properties.
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Affiliation(s)
- Ravi Ketavath
- Solar Cells and Photonics Research Laboratory, School of Chemistry , University of Hyderabad , Hyderabad , Telangana 500046 , India
| | - Naga Krishnakanth Katturi
- Advanced Center of Research in High Energy Materials (ACRHEM) , University of Hyderabad , Prof. C. R. Rao Road , Hyderabad 500046 , Telangana , India
| | - Sachin G Ghugal
- Solar Cells and Photonics Research Laboratory, School of Chemistry , University of Hyderabad , Hyderabad , Telangana 500046 , India
| | - Hema Kumari Kolli
- Solar Cells and Photonics Research Laboratory, School of Chemistry , University of Hyderabad , Hyderabad , Telangana 500046 , India
| | - T Swetha
- Solar Cells and Photonics Research Laboratory, School of Chemistry , University of Hyderabad , Hyderabad , Telangana 500046 , India
| | - Venugopal Rao Soma
- Advanced Center of Research in High Energy Materials (ACRHEM) , University of Hyderabad , Prof. C. R. Rao Road , Hyderabad 500046 , Telangana , India
| | - Banavoth Murali
- Solar Cells and Photonics Research Laboratory, School of Chemistry , University of Hyderabad , Hyderabad , Telangana 500046 , India
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7
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Aruna-Devi R, Latha M, Velumani S, Santos-Cruz J, Murali B, Chávez-Carvayar JÁ, Pulgarín-Agudelo FA, Vigil-Galán O. Cu 2ZnSn(S,Se) 4 thin-films prepared from selenized nanocrystals ink. RSC Adv 2019; 9:18420-18428. [PMID: 35515224 PMCID: PMC9064833 DOI: 10.1039/c9ra02669j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 06/03/2019] [Indexed: 01/15/2023] Open
Abstract
For the first time, CZTS ink was formulated using low-temperature heating up synthesis of NCs. Besides, the influence of powder concentration on the properties of the films was examined. Subsequently, the CZTS films were annealed under a selenium (Se)/argon (Ar) atmosphere at different temperatures to enhance their properties. The influence of selenization temperature on the properties of CZTS films was examined in detail. Structural analysis showed a peak shift towards lower 2θ values for CZTSSe films because of Se incorporation, resulting in larger lattice parameters for CZTSSe than CZTS. As the selenization temperature increases, an increment in the grain size was observed and the band gap was decreased from 1.52 to 1.05 eV. Hall Effect studies revealed a significant improvement in the mobility and carrier concentration with respect to selenization temperatures. Moreover, film selenized at 550 °C exhibited higher photoconductivity as compared to other films, indicating their potential application in the field of low-cost thin-film solar cells. For the first time, CZTS ink was formulated using low-temperature heating up synthesis of NCs.![]()
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Affiliation(s)
- R Aruna-Devi
- Facultad de Química, Materiales-Energía, Universidad Autónoma de Querétaro 76010 Santiago de Querétaro Qro Mexico
| | - M Latha
- Facultad de Química, Materiales-Energía, Universidad Autónoma de Querétaro 76010 Santiago de Querétaro Qro Mexico
| | - S Velumani
- Departamento de Ingeniería Eléctrica (SEES), CINVESTAV-IPN Av. IPN 2508 07360 San Pedro Zacatenco Mexico
| | - J Santos-Cruz
- Facultad de Química, Materiales-Energía, Universidad Autónoma de Querétaro 76010 Santiago de Querétaro Qro Mexico
| | - Banavoth Murali
- Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad Prof. C. R. Rao Road Telangana India 500046
| | | | | | - O Vigil-Galán
- Escuela Superior de Física y Matemáticas - Instituto Politécnico Nacional (ESFM - IPN) 07738 Mexico
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8
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Latha M, Aruna-Devi R, Velumani S, Murali B, Santoyo-Salazar J, de Moure-Flores F. Solution based synthesis of Cu(In,Ga)Se2 microcrystals and thin films. RSC Adv 2019; 9:35197-35208. [PMID: 35530668 PMCID: PMC9074129 DOI: 10.1039/c9ra07750b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 10/21/2019] [Indexed: 01/09/2023] Open
Abstract
Herein, for the first time, we report the synthesis of quaternary Cu(In,Ga)Se2 microcrystals (CIGSe MCs) using a facile and economical one-pot heating-up method. The most important parameters such as reaction temperature and time were varied to study their influences on the structural, morphological, compositional and optical properties of the MCs. Based on the results, the formation of CIGSe was initiated from binary β-CuSe and then converted into pure phase CIGSe by gradual incorporation of In3+ and Ga3+ ions into the β-CuSe crystal lattice. As the reaction time increases, the band gap energy was increased from 1.10 to 1.28 eV, whereas the size of the crystals increased from 0.9 to 3.1 μm. Besides, large-scale synthesis of CIGSe MCs exhibited a high reaction yield of 90%. Furthermore, the CIGSe MCs dispersed in the ethanol was coated as thin films by a drop casting method, which showed the optimum carrier concentration, high mobility and low resistivity. Moreover, the photoconductivity of the CIGSe MC thin film was enhanced by three order magnitude in comparison with CIGSe NC thin films. The solar cells fabricated with CIGSe MCs showed the PCE of 0.59% which is 14.75 times higher than CIGSe NCs. These preliminary results confirmed the potential of CIGSe MCs as an active absorber layer in low-cost thin film solar cells. Herein, for the first time, we report the synthesis of quaternary Cu(In,Ga)Se2 microcrystals (CIGSe MCs) using a facile and economical one-pot heating-up method.![]()
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Affiliation(s)
- M. Latha
- Facultad de Química
- Materiales-Energía
- Universidad Autónomade Querétaro (UAQ)
- Santiago de Querétaro
- Mexico
| | - R. Aruna-Devi
- Facultad de Química
- Materiales-Energía
- Universidad Autónomade Querétaro (UAQ)
- Santiago de Querétaro
- Mexico
| | - S. Velumani
- Departamento de Ingeniería Eléctrica
- C.P. 07360 Ciudad de México
- Mexico
| | - B. Murali
- Solar Cells and Photonics Research Laboratory
- School of Chemistry
- University of Hyderabad
- India
| | | | - F. de Moure-Flores
- Facultad de Química
- Materiales-Energía
- Universidad Autónomade Querétaro (UAQ)
- Santiago de Querétaro
- Mexico
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9
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Peng W, Yin J, Ho KT, Ouellette O, De Bastiani M, Murali B, El Tall O, Shen C, Miao X, Pan J, Alarousu E, He JH, Ooi BS, Mohammed OF, Sargent E, Bakr OM. Ultralow Self-Doping in Two-dimensional Hybrid Perovskite Single Crystals. Nano Lett 2017; 17:4759-4767. [PMID: 28657752 DOI: 10.1021/acs.nanolett.7b01475] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Unintentional self-doping in semiconductors through shallow defects is detrimental to optoelectronic device performance. It adversely affects junction properties and it introduces electronic noise. This is especially acute for solution-processed semiconductors, including hybrid perovskites, which are usually high in defects due to rapid crystallization. Here, we uncover extremely low self-doping concentrations in single crystals of the two-dimensional perovskites (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n-1 (n = 1, 2, and 3), over three orders of magnitude lower than those of typical three-dimensional hybrid perovskites, by analyzing their conductivity behavior. We propose that crystallization of hybrid perovskites containing large organic cations suppresses defect formation and thus favors a low self-doping level. To exemplify the benefits of this effect, we demonstrate extraordinarily high light-detectivity (1013 Jones) in (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n-1 photoconductors due to the reduced electronic noise, which makes them particularly attractive for the detection of weak light signals. Furthermore, the low self-doping concentration reduces the equilibrium charge carrier concentration in (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n-1, advantageous in the design of p-i-n heterojunction solar cells by optimizing band alignment and promoting carrier depletion in the intrinsic perovskite layer, thereby enhancing charge extraction.
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Affiliation(s)
- Wei Peng
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
- KAUST Solar Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
- KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Jun Yin
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Kang-Ting Ho
- Division of Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Olivier Ouellette
- Department of Electrical and Computer Engineering, University of Toronto , 10 King's College Road, Toronto, Ontario M5S 3G4, Canada
| | - Michele De Bastiani
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Banavoth Murali
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Omar El Tall
- Analytical Core Lab, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Chao Shen
- Division of Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Xiaohe Miao
- Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Jun Pan
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Erkki Alarousu
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Jr-Hau He
- Division of Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Boon S Ooi
- Division of Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Omar F Mohammed
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Edward Sargent
- Department of Electrical and Computer Engineering, University of Toronto , 10 King's College Road, Toronto, Ontario M5S 3G4, Canada
| | - Osman M Bakr
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
- KAUST Solar Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
- KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
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10
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Kim T, Palmiano E, Liang RZ, Hu H, Murali B, Kirmani AR, Firdaus Y, Gao Y, Sheikh A, Yuan M, Mohammed OF, Hoogland S, Beaujuge PM, Sargent EH, Amassian A. Hybrid tandem quantum dot/organic photovoltaic cells with complementary near infrared absorption. Appl Phys Lett 2017; 110:223903. [PMID: 28652643 PMCID: PMC5453788 DOI: 10.1063/1.4984023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 05/10/2017] [Indexed: 05/13/2023]
Abstract
Monolithically integrated hybrid tandem solar cells that effectively combine solution-processed colloidal quantum dot (CQD) and organic bulk heterojunction subcells to achieve tandem performance that surpasses the individual subcell efficiencies have not been demonstrated to date. In this work, we demonstrate hybrid tandem cells with a low bandgap PbS CQD subcell harvesting the visible and near-infrared photons and a polymer:fullerene-poly (diketopyrrolopyrrole-terthiophene) (PDPP3T):[6,6]-phenyl-C60-butyric acid methyl ester (PC61BM)-top cell absorbing effectively the red and near-infrared photons of the solar spectrum in a complementary fashion. The two subcells are connected in series via an interconnecting layer (ICL) composed of a metal oxide layer, a conjugated polyelectrolyte, and an ultrathin layer of Au. The ultrathin layer of Au forms nano-islands in the ICL, reducing the series resistance, increasing the shunt resistance, and enhancing the device fill-factor. The hybrid tandems reach a power conversion efficiency (PCE) of 7.9%, significantly higher than the PCE of the corresponding individual single cells, representing one of the highest efficiencies reported to date for hybrid tandem solar cells based on CQD and polymer subcells.
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Affiliation(s)
- Taesoo Kim
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Elenita Palmiano
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
| | - Ru-Ze Liang
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Hanlin Hu
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Banavoth Murali
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Ahmad R Kirmani
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Yuliar Firdaus
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Yangqin Gao
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Arif Sheikh
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Mingjian Yuan
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
| | - Omar F Mohammed
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Sjoerd Hoogland
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
| | - Pierre M Beaujuge
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
| | - Aram Amassian
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), and Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
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11
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Barbé J, Tietze ML, Neophytou M, Murali B, Alarousu E, Labban AE, Abulikemu M, Yue W, Mohammed OF, McCulloch I, Amassian A, Del Gobbo S. Amorphous Tin Oxide as a Low-Temperature-Processed Electron-Transport Layer for Organic and Hybrid Perovskite Solar Cells. ACS Appl Mater Interfaces 2017; 9:11828-11836. [PMID: 28177212 DOI: 10.1021/acsami.6b13675] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Chemical bath deposition (CBD) of tin oxide (SnO2) thin films as an electron-transport layer (ETL) in a planar-heterojunction n-i-p organohalide lead perovskite and organic bulk-heterojunction (BHJ) solar cells is reported. The amorphous SnO2 (a-SnO2) films are grown from a nontoxic aqueous bath of tin chloride at a very low temperature (55 °C) and do not require postannealing treatment to work very effectively as an ETL in a planar-heterojunction n-i-p organohalide lead perovskite or organic BHJ solar cells, in lieu of the commonly used ETL materials titanium oxide (TiO2) and zinc oxide (ZnO), respectively. Ultraviolet photoelectron spectroscopy measurements on the glass/indium-tin oxide (ITO)/SnO2/methylammonium lead iodide (MAPbI3)/2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene device stack indicate that extraction of photogenerated electrons is facilitated by a perfect alignment of the conduction bands at the SnO2/MAPbI3 interface, while the deep valence band of SnO2 ensures strong hole-blocking properties. Despite exhibiting very low electron mobility, the excellent interfacial energetics combined with high transparency (Egap,optical > 4 eV) and uniform substrate coverage make the a-SnO2 ETL prepared by CBD an excellent candidate for the potentially low-cost and large-scale fabrication of organohalide lead perovskite and organic photovoltaics.
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Affiliation(s)
- Jérémy Barbé
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Max L Tietze
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Marios Neophytou
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Banavoth Murali
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Erkki Alarousu
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Abdulrahman El Labban
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Mutalifu Abulikemu
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Wan Yue
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Omar F Mohammed
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Iain McCulloch
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Aram Amassian
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
| | - Silvano Del Gobbo
- KAUST Solar Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
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12
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Sarmah SP, Burlakov VM, Yengel E, Murali B, Alarousu E, El-Zohry AM, Yang C, Alias MS, Zhumekenov AA, Saidaminov MI, Cho N, Wehbe N, Mitra S, Ajia I, Dey S, Mansour AE, Abdelsamie M, Amassian A, Roqan IS, Ooi BS, Goriely A, Bakr OM, Mohammed OF. Double Charged Surface Layers in Lead Halide Perovskite Crystals. Nano Lett 2017; 17:2021-2027. [PMID: 28145714 DOI: 10.1021/acs.nanolett.7b00031] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Understanding defect chemistry, particularly ion migration, and its significant effect on the surface's optical and electronic properties is one of the major challenges impeding the development of hybrid perovskite-based devices. Here, using both experimental and theoretical approaches, we demonstrated that the surface layers of the perovskite crystals may acquire a high concentration of positively charged vacancies with the complementary negatively charged halide ions pushed to the surface. This charge separation near the surface generates an electric field that can induce an increase of optical band gap in the surface layers relative to the bulk. We found that the charge separation, electric field, and the amplitude of shift in the bandgap strongly depend on the halides and organic moieties of perovskite crystals. Our findings reveal the peculiarity of surface effects that are currently limiting the applications of perovskite crystals and more importantly explain their origins, thus enabling viable surface passivation strategies to remediate them.
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Affiliation(s)
| | - Victor M Burlakov
- Mathematical Institute, University of Oxford , Woodstock Road, Oxford OX2 6GG, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Alain Goriely
- Mathematical Institute, University of Oxford , Woodstock Road, Oxford OX2 6GG, United Kingdom
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13
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Zhang Y, Saidaminov MI, Dursun I, Yang H, Murali B, Alarousu E, Yengel E, Alshankiti BA, Bakr OM, Mohammed OF. Zero-Dimensional Cs 4PbBr 6 Perovskite Nanocrystals. J Phys Chem Lett 2017; 8:961-965. [PMID: 28181438 DOI: 10.1021/acs.jpclett.7b00105] [Citation(s) in RCA: 127] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Perovskite nanocrystals (NCs) have become leading candidates for solution-processed optoelectronics applications. While substantial work has been published on 3-D perovskite phases, the NC form of the zero-dimensional (0-D) phase of this promising class of materials remains elusive. Here we report the synthesis of a new class of colloidal semiconductor NCs based on Cs4PbBr6, the 0-D perovskite, enabled through the design of a novel low-temperature reverse microemulsion method with 85% reaction yield. These 0-D perovskite NCs exhibit high photoluminescence quantum yield (PLQY) in the colloidal form (PLQY: 65%), and, more importantly, in the form of thin film (PLQY: 54%). Notably, the latter is among the highest values reported so far for perovskite NCs in the solid form. Our work brings the 0-D phase of perovskite into the realm of colloidal NCs with appealingly high PLQY in the film form, which paves the way for their practical application in real devices.
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Affiliation(s)
- Yuhai Zhang
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Makhsud I Saidaminov
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ibrahim Dursun
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Haoze Yang
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Erkki Alarousu
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Emre Yengel
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Buthainah A Alshankiti
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
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14
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Murali B, Yengel E, Peng W, Chen Z, Alias MS, Alarousu E, Ooi BS, Burlakov V, Goriely A, Eddaoudi M, Bakr OM, Mohammed OF. Temperature-Induced Lattice Relaxation of Perovskite Crystal Enhances Optoelectronic Properties and Solar Cell Performance. J Phys Chem Lett 2017; 8:137-143. [PMID: 27966364 DOI: 10.1021/acs.jpclett.6b02684] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Hybrid organic-inorganic perovskite crystals have recently become one of the most important classes of photoactive materials in the solar cell and optoelectronic communities. Albeit improvements have focused on state-of-the-art technology including various fabrication methods, device architectures, and surface passivation, progress is yet to be made in understanding the actual operational temperature on the electronic properties and the device performances. Therefore, the substantial effect of temperature on the optoelectronic properties, charge separation, charge recombination dynamics, and photoconversion efficiency are explored. The results clearly demonstrated a significant enhancement in the carrier mobility, photocurrent, charge carrier lifetime, and solar cell performance in the 60 ± 5 °C temperature range. In this temperature range, perovskite crystal exhibits a highly symmetrical relaxed cubic structure with well-aligned domains that are perpendicular to a principal axis, thereby remarkably improving the device operation. This finding provides a new key variable component and paves the way toward using perovskite crystals in highly efficient photovoltaic cells.
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Affiliation(s)
- Banavoth Murali
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Emre Yengel
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Wei Peng
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Zhijie Chen
- King Abdullah University of Science and Technology , Functional Materials Design, Discovery and Development Research Group, Advanced Membranes and Porous Materials Center, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mohd S Alias
- King Abdullah University of Science and Technology , Photonics Laboratory, Computer, Electrical and Mathematical Sciences and Engineering Division, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Erkki Alarousu
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Boon S Ooi
- King Abdullah University of Science and Technology , Photonics Laboratory, Computer, Electrical and Mathematical Sciences and Engineering Division, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Victor Burlakov
- Mathematical Institute, University of Oxford , Woodstock Road, Oxford OX2 6GG, United Kingdom
| | - Alain Goriely
- Mathematical Institute, University of Oxford , Woodstock Road, Oxford OX2 6GG, United Kingdom
| | - Mohamed Eddaoudi
- King Abdullah University of Science and Technology , Functional Materials Design, Discovery and Development Research Group, Advanced Membranes and Porous Materials Center, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
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15
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Begum R, Parida MR, Abdelhady AL, Murali B, Alyami NM, Ahmed GH, Hedhili MN, Bakr OM, Mohammed OF. Engineering Interfacial Charge Transfer in CsPbBr 3 Perovskite Nanocrystals by Heterovalent Doping. J Am Chem Soc 2016; 139:731-737. [PMID: 27977176 DOI: 10.1021/jacs.6b09575] [Citation(s) in RCA: 171] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Since compelling device efficiencies of perovskite solar cells have been achieved, investigative efforts have turned to understand other key challenges in these systems, such as engineering interfacial energy-level alignment and charge transfer (CT). However, these types of studies on perovskite thin-film devices are impeded by the morphological and compositional heterogeneity of the films and their ill-defined surfaces. Here, we use well-defined ligand-protected perovskite nanocrystals (NCs) as model systems to elucidate the role of heterovalent doping on charge-carrier dynamics and energy level alignment at the interface of perovskite NCs with molecular acceptors. More specifically, we develop an in situ doping approach for colloidal CsPbBr3 perovskite NCs with heterovalent Bi3+ ions by hot injection to precisely tune their band structure and excited-state dynamics. This synthetic method allowed us to map the impact of doping on CT from the NCs to different molecular acceptors. Using time-resolved spectroscopy with broadband capability, we clearly demonstrate that CT at the interface of NCs can be tuned and promoted by metal ion doping. We found that doping increases the energy difference between states of the molecular acceptor and the donor moieties, subsequently facilitating the interfacial CT process. This work highlights the key variable components not only for promoting interfacial CT in perovskites, but also for establishing a higher degree of precision and control over the surface and the interface of perovskite molecular acceptors.
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Affiliation(s)
- Raihana Begum
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Manas R Parida
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ahmed L Abdelhady
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Noktan M Alyami
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ghada H Ahmed
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mohamed Nejib Hedhili
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- KAUST Solar Center, Division of Physical Sciences and Engineering and ‡Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
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16
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Cho N, Li F, Turedi B, Sinatra L, Sarmah SP, Parida MR, Saidaminov MI, Murali B, Burlakov VM, Goriely A, Mohammed OF, Wu T, Bakr OM. Pure crystal orientation and anisotropic charge transport in large-area hybrid perovskite films. Nat Commun 2016; 7:13407. [PMID: 27830694 PMCID: PMC5109592 DOI: 10.1038/ncomms13407] [Citation(s) in RCA: 145] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 09/29/2016] [Indexed: 01/09/2023] Open
Abstract
Controlling crystal orientations and macroscopic morphology is vital to develop the electronic properties of hybrid perovskites. Here we show that a large-area, orientationally pure crystalline (OPC) methylammonium lead iodide (MAPbI3) hybrid perovskite film can be fabricated using a thermal-gradient-assisted directional crystallization method that relies on the sharp liquid-to-solid transition of MAPbI3 from ionic liquid solution. We find that the OPC films spontaneously form periodic microarrays that are distinguishable from general polycrystalline perovskite materials in terms of their crystal orientation, film morphology and electronic properties. X-ray diffraction patterns reveal that the film is strongly oriented in the (112) and (200) planes parallel to the substrate. This film is structurally confined by directional crystal growth, inducing intense anisotropy in charge transport. In addition, the low trap-state density (7.9 × 1013 cm-3) leads to strong amplified stimulated emission. This ability to control crystal orientation and morphology could be widely adopted in optoelectronic devices.
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Affiliation(s)
- Namchul Cho
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Feng Li
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Bekir Turedi
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Lutfan Sinatra
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Smritakshi P. Sarmah
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Manas R. Parida
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Makhsud I. Saidaminov
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Banavoth Murali
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Victor M. Burlakov
- Mathematical Institute, University of Oxford, Woodstock Road, Oxford OX2 6GG, UK
| | - Alain Goriely
- Mathematical Institute, University of Oxford, Woodstock Road, Oxford OX2 6GG, UK
| | - Omar F. Mohammed
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Tom Wu
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Osman M. Bakr
- Division of Physical Sciences and Engineering (PSE), KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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17
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Ahmed GH, Liu J, Parida MR, Murali B, Bose R, AlYami NM, Hedhili MN, Peng W, Pan J, Besong TMD, Bakr OM, Mohammed OF. Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors. J Phys Chem Lett 2016; 7:3913-3919. [PMID: 27640429 DOI: 10.1021/acs.jpclett.6b01910] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Hybrid organic/inorganic perovskites have recently emerged as an important class of materials and have exhibited remarkable performance in photovoltaics. To further improve their device efficiency, an insightful understanding of the interfacial charge transfer (CT) process is required. Here, we report the first direct experimental observation of the tremendous effect that the shape of perovskite nanocrystals (NCs) has on interfacial CT in the presence of a molecular acceptor. A dramatic change in CT dynamics at the interfaces of three different NC shapes, spheres, platelets, and cubes, is recorded. Our results clearly demonstrate that the mechanism of CT is significantly affected by the NC shape. More importantly, the results demonstrate that complexation on the NC surface acts as an additional driving force not only to tune the CT dynamics but also to control the reaction mechanism at the interface. This observation opens a new venue for further developing perovskite NCs-based applications.
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Affiliation(s)
- Ghada H Ahmed
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Jiakai Liu
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Manas R Parida
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Riya Bose
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Noktan M AlYami
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mohamed N Hedhili
- Imaging and Characterization Laboratory, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Wei Peng
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Jun Pan
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Tabot M D Besong
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia
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18
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Pan J, Quan LN, Zhao Y, Peng W, Murali B, Sarmah SP, Yuan M, Sinatra L, Alyami NM, Liu J, Yassitepe E, Yang Z, Voznyy O, Comin R, Hedhili MN, Mohammed OF, Lu ZH, Kim DH, Sargent EH, Bakr OM. Highly Efficient Perovskite-Quantum-Dot Light-Emitting Diodes by Surface Engineering. Adv Mater 2016; 28:8718-8725. [PMID: 27529532 DOI: 10.1002/adma.201600784] [Citation(s) in RCA: 396] [Impact Index Per Article: 49.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 07/10/2016] [Indexed: 05/20/2023]
Abstract
A two-step ligand-exchange strategy is developed, in which the long-carbon- chain ligands on all-inorganic perovskite (CsPbX3 , X = Br, Cl) quantum dots (QDs) are replaced with halide-ion-pair ligands. Green and blue light-emitting diodes made from the halide-ion-pair-capped quantum dots exhibit high external quantum efficiencies compared with the untreated QDs.
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Affiliation(s)
- Jun Pan
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Li Na Quan
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
- Department of Chemistry and Nano Science, Ewha Woman's University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea
| | - Yongbiao Zhao
- Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, M5S 3E4, Canada
| | - Wei Peng
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Smritakshi P Sarmah
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Mingjian Yuan
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Lutfan Sinatra
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Noktan M Alyami
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Jiakai Liu
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Emre Yassitepe
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Zhenyu Yang
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Oleksandr Voznyy
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Riccardo Comin
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Mohamed N Hedhili
- Imaging and Characterization Laboratory, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Zheng Hong Lu
- Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, M5S 3E4, Canada
| | - Dong Ha Kim
- Department of Chemistry and Nano Science, Ewha Woman's University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.
| | - Osman M Bakr
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia.
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19
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Haikal RR, Wang X, Hassan YS, Parida MR, Murali B, Mohammed OF, Pellechia PJ, Fontecave M, Alkordi MH. Porous-Hybrid Polymers as Platforms for Heterogeneous Photochemical Catalysis. ACS Appl Mater Interfaces 2016; 8:19994-20002. [PMID: 27428561 DOI: 10.1021/acsami.6b05031] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A number of permanently porous polymers containing Ru(bpy)n photosensitizer or a cobaloxime complex, as a proton-reduction catalyst, were constructed via one-pot Sonogashira-Hagihara (SH) cross-coupling reactions. This process required minimal workup to access porous platforms with control over the apparent surface area, pore volume, and chemical functionality from suitable molecular building blocks (MBBs) containing the Ru or Co complexes, as rigid and multitopic nodes. The cobaloxime molecular building block, generated through in situ metalation, afforded a microporous solid that demonstrated noticeable catalytic activity toward hydrogen-evolution reaction (HER) with remarkable recyclability. We further demonstrated, in two cases, the ability to affect the excited-state lifetime of the covalently immobilized Ru(bpy)3 complex attained through deliberate utilization of the organic linkers of variable dimensions. Overall, this approach facilitates construction of tunable porous solids, with hybrid composition and pronounced chemical and physical stability, based on the well-known Ru(bpy)nor the cobaloxime complexes.
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Affiliation(s)
- Rana R Haikal
- Center for Materials Science, Zewail City of Science and Technology , Sheikh Zayed District, 12588 Giza, Egypt
| | - Xia Wang
- Laboratoire de Chimie des Processus Biologiques, PSL Research University, Collège de France, CNRS UMR8229, Université Pierre et Marie Curie , 11 Place Marcelin Berthelot, 75231 Cedex 05 Paris, France
| | - Youssef S Hassan
- Center for Materials Science, Zewail City of Science and Technology , Sheikh Zayed District, 12588 Giza, Egypt
| | - Manas R Parida
- Division of Physical Science and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- Division of Physical Science and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- Division of Physical Science and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Perry J Pellechia
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Marc Fontecave
- Laboratoire de Chimie des Processus Biologiques, PSL Research University, Collège de France, CNRS UMR8229, Université Pierre et Marie Curie , 11 Place Marcelin Berthelot, 75231 Cedex 05 Paris, France
| | - Mohamed H Alkordi
- Center for Materials Science, Zewail City of Science and Technology , Sheikh Zayed District, 12588 Giza, Egypt
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20
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Peng W, Miao X, Adinolfi V, Alarousu E, El Tall O, Emwas AH, Zhao C, Walters G, Liu J, Ouellette O, Pan J, Murali B, Sargent EH, Mohammed OF, Bakr OM. Engineering of CH3
NH3
PbI3
Perovskite Crystals by Alloying Large Organic Cations for Enhanced Thermal Stability and Transport Properties. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201604880] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wei Peng
- Division of Physical Sciences and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Xiaohe Miao
- Imaging and Characterization Core Lab; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Valerio Adinolfi
- Department of Electrical and Computer Engineering; University of Toronto; Toronto Ontario M5S 3G4 Canada
| | - Erkki Alarousu
- Division of Physical Sciences and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Omar El Tall
- Analytical Core Lab; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Abdul-Hamid Emwas
- Imaging and Characterization Core Lab; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Chao Zhao
- Imaging and Characterization Core Lab; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Grant Walters
- Department of Electrical and Computer Engineering; University of Toronto; Toronto Ontario M5S 3G4 Canada
| | - Jiakai Liu
- Division of Physical Sciences and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Olivier Ouellette
- Department of Electrical and Computer Engineering; University of Toronto; Toronto Ontario M5S 3G4 Canada
| | - Jun Pan
- Division of Physical Sciences and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Banavoth Murali
- Division of Physical Sciences and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Edward H. Sargent
- Department of Electrical and Computer Engineering; University of Toronto; Toronto Ontario M5S 3G4 Canada
| | - Omar F. Mohammed
- Division of Physical Sciences and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Osman M. Bakr
- Division of Physical Sciences and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
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21
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Peng W, Miao X, Adinolfi V, Alarousu E, El Tall O, Emwas AH, Zhao C, Walters G, Liu J, Ouellette O, Pan J, Murali B, Sargent EH, Mohammed OF, Bakr OM. Engineering of CH3 NH3 PbI3 Perovskite Crystals by Alloying Large Organic Cations for Enhanced Thermal Stability and Transport Properties. Angew Chem Int Ed Engl 2016; 55:10686-90. [PMID: 27468159 DOI: 10.1002/anie.201604880] [Citation(s) in RCA: 128] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 11/08/2022]
Abstract
The number of studies on organic-inorganic hybrid perovskites has soared in recent years. However, the majority of hybrid perovskites under investigation are based on a limited number of organic cations of suitable sizes, such as methylammonium and formamidinium. These small cations easily fit into the perovskite's three-dimensional (3D) lead halide framework to produce semiconductors with excellent charge transport properties. Until now, larger cations, such as ethylammonium, have been found to form 2D crystals with lead halide. Here we show for the first time that ethylammonium can in fact be incorporated coordinately with methylammonium in the lattice of a 3D perovskite thanks to a balance of opposite lattice distortion strains. This inclusion results in higher crystal symmetry, improved material stability, and markedly enhanced charge carrier lifetime. This crystal engineering strategy of balancing opposite lattice distortion effects vastly increases the number of potential choices of organic cations for 3D perovskites, opening up new degrees of freedom to tailor their optoelectronic and environmental properties.
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Affiliation(s)
- Wei Peng
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Xiaohe Miao
- Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Valerio Adinolfi
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Erkki Alarousu
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Omar El Tall
- Analytical Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Abdul-Hamid Emwas
- Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Chao Zhao
- Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Grant Walters
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Jiakai Liu
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Olivier Ouellette
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Jun Pan
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Banavoth Murali
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Omar F Mohammed
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Osman M Bakr
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
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22
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Peng W, Wang L, Murali B, Ho KT, Bera A, Cho N, Kang CF, Burlakov VM, Pan J, Sinatra L, Ma C, Xu W, Shi D, Alarousu E, Goriely A, He JH, Mohammed OF, Wu T, Bakr OM. Solution-Grown Monocrystalline Hybrid Perovskite Films for Hole-Transporter-Free Solar Cells. Adv Mater 2016; 28:3383-3390. [PMID: 26931100 DOI: 10.1002/adma.201506292] [Citation(s) in RCA: 110] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 01/18/2016] [Indexed: 06/05/2023]
Abstract
High-quality perovskite monocrystalline films are successfully grown through cavitation-triggered asymmetric crystallization. These films enable a simple cell structure, ITO/CH3 NH3 PbBr3 /Au, with near 100% internal quantum efficiency, promising power conversion efficiencies (PCEs) >5%, and superior stability for prototype cells. Furthermore, the monocrystalline devices using a hole-transporter-free structure yield PCEs ≈6.5%, the highest among other similar-structured CH3 NH3 PbBr3 solar cells to date.
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Affiliation(s)
- Wei Peng
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Lingfei Wang
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Kang-Ting Ho
- Division of Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Ashok Bera
- Materials Science and Engineering, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Namchul Cho
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Chen-Fang Kang
- Division of Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Victor M Burlakov
- Mathematical Institute, University of Oxford, Woodstock Road, Oxford, OX2 6GG, UK
| | - Jun Pan
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Lutfan Sinatra
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Chun Ma
- Materials Science and Engineering, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Wei Xu
- Imaging and Characterization Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Dong Shi
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Erkki Alarousu
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Alain Goriely
- Mathematical Institute, University of Oxford, Woodstock Road, Oxford, OX2 6GG, UK
| | - Jr-Hau He
- Division of Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Tom Wu
- Materials Science and Engineering, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center (SPERC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
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23
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Abdelhady AL, Saidaminov MI, Murali B, Adinolfi V, Voznyy O, Katsiev K, Alarousu E, Comin R, Dursun I, Sinatra L, Sargent EH, Mohammed OF, Bakr OM. Heterovalent Dopant Incorporation for Bandgap and Type Engineering of Perovskite Crystals. J Phys Chem Lett 2016; 7:295-301. [PMID: 26727130 DOI: 10.1021/acs.jpclett.5b02681] [Citation(s) in RCA: 122] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Controllable doping of semiconductors is a fundamental technological requirement for electronic and optoelectronic devices. As intrinsic semiconductors, hybrid perovskites have so far been a phenomenal success in photovoltaics. The inability to dope these materials heterovalently (or aliovalently) has greatly limited their wider utilizations in electronics. Here we show an efficient in situ chemical route that achieves the controlled incorporation of trivalent cations (Bi(3+), Au(3+), or In(3+)) by exploiting the retrograde solubility behavior of perovskites. We term the new method dopant incorporation in the retrograde regime. We achieve Bi(3+) incorporation that leads to bandgap tuning (∼300 meV), 10(4) fold enhancement in electrical conductivity, and a change in the sign of majority charge carriers from positive to negative. This work demonstrates the successful incorporation of dopants into perovskite crystals while preserving the host lattice structure, opening new avenues to tailor the electronic and optoelectronic properties of this rapidly emerging class of solution-processed semiconductors.
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Affiliation(s)
- Ahmed L Abdelhady
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
- Department of Chemistry, Faculty of Science, Mansoura University , Mansoura, 35516, Egypt
| | - Makhsud I Saidaminov
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Valerio Adinolfi
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Oleksandr Voznyy
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Khabiboulakh Katsiev
- SABIC Corporate Research and Innovation Center, King Abdullah University of Science and Technology (KAUST) , Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Erkki Alarousu
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Riccardo Comin
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Ibrahim Dursun
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Lutfan Sinatra
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Omar F Mohammed
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
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24
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Pan J, Sarmah SP, Murali B, Dursun I, Peng W, Parida MR, Liu J, Sinatra L, Alyami N, Zhao C, Alarousu E, Ng TK, Ooi BS, Bakr OM, Mohammed OF. Air-Stable Surface-Passivated Perovskite Quantum Dots for Ultra-Robust, Single- and Two-Photon-Induced Amplified Spontaneous Emission. J Phys Chem Lett 2015; 6:5027-33. [PMID: 26624490 DOI: 10.1021/acs.jpclett.5b02460] [Citation(s) in RCA: 206] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We demonstrate ultra-air- and photostable CsPbBr3 quantum dots (QDs) by using an inorganic-organic hybrid ion pair as the capping ligand. This passivation approach to perovskite QDs yields high photoluminescence quantum yield with unprecedented operational stability in ambient conditions (60 ± 5% lab humidity) and high pump fluences, thus overcoming one of the greatest challenges impeding the development of perovskite-based applications. Due to the robustness of passivated perovskite QDs, we were able to induce ultrastable amplified spontaneous emission (ASE) in solution processed QD films not only through one photon but also through two-photon absorption processes. The latter has not been observed before in the family of perovskite materials. More importantly, passivated perovskite QD films showed remarkable photostability under continuous pulsed laser excitation in ambient conditions for at least 34 h (corresponds to 1.2 × 10(8) laser shots), substantially exceeding the stability of other colloidal QD systems in which ASE has been observed.
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Affiliation(s)
- Jun Pan
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Smritakshi P Sarmah
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ibrahim Dursun
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Wei Peng
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Manas R Parida
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Jiakai Liu
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Lutfan Sinatra
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Noktan Alyami
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Chao Zhao
- Advanced Nanofabrication, Imaging and Characterization Core Laboratories
| | - Erkki Alarousu
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Tien Khee Ng
- Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Boon S Ooi
- Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
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25
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Murali B, Labban AE, Eid J, Alarousu E, Shi D, Zhang Q, Zhang X, Bakr OM, Mohammed OF. The Impact of Grain Alignment of the Electron Transporting Layer on the Performance of Inverted Bulk Heterojunction Solar Cells. Small 2015; 11:5272-5279. [PMID: 26270242 DOI: 10.1002/smll.201500924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Revised: 07/07/2015] [Indexed: 06/04/2023]
Abstract
This report presents a new strategy for improving solar cell power conversion efficiencies (PCEs) through grain alignment and morphology control of the ZnO electron transport layer (ETL) prepared by radio frequency (RF) magnetron sputtering. The systematic control over the ETL's grain alignment and thickness is shown, by varying the deposition pressure and operating substrate temperature during the deposition. Notably, a high PCE of 6.9%, short circuit current density (J(sc)) of 12.8 mA cm(-2), open circuit voltage (V(oc)) of 910 mV, and fill factor of 59% are demonstrated using the poly(benzo[1,2-b:4,5-b']dithiophene-thieno[3,4-c]pyrrole-4,6-dione):[6,6]-phenyl-C(71) -butyric acid methyl ester polymer blend with ETLs prepared at room temperature exhibiting oriented and aligned rod-like ZnO grains. Increasing the deposition temperature during the ZnO sputtering induces morphological cleavage of the rod-like ZnO grains and therefore reduced conductivity from 7.2 × 10(-13) to ≈1.7 × 10(-14) S m(-1) and PCE from 6.9% to 4.28%. An investigation of the charge carrier dynamics by femtosecond (fs) transient absorption spectroscopy with broadband capability reveals clear evidence of faster carrier recombination for a ZnO layer deposited at higher temperature, which is consistent with the conductivity and device performance.
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Affiliation(s)
- Banavoth Murali
- Solar and Photovoltaics Engineering Research Center (SPERC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Abdulrahman El Labban
- Solar and Photovoltaics Engineering Research Center (SPERC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Jessica Eid
- Solar and Photovoltaics Engineering Research Center (SPERC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Erkki Alarousu
- Solar and Photovoltaics Engineering Research Center (SPERC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Dong Shi
- Solar and Photovoltaics Engineering Research Center (SPERC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Qiang Zhang
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Xixiang Zhang
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Osman M Bakr
- Solar and Photovoltaics Engineering Research Center (SPERC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Omar F Mohammed
- Solar and Photovoltaics Engineering Research Center (SPERC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
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26
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Maculan G, Sheikh AD, Abdelhady AL, Saidaminov MI, Haque MA, Murali B, Alarousu E, Mohammed OF, Wu T, Bakr OM. CH3NH3PbCl3 Single Crystals: Inverse Temperature Crystallization and Visible-Blind UV-Photodetector. J Phys Chem Lett 2015; 6:3781-6. [PMID: 26722870 DOI: 10.1021/acs.jpclett.5b01666] [Citation(s) in RCA: 269] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Single crystals of hybrid perovskites have shown remarkably improved physical properties compared to their polycrystalline film counterparts, underscoring their importance in the further development of advanced semiconductor devices. Here we present a new method of growing sizable CH3NH3PbCl3 single crystals based on the retrograde solubility behavior of hybrid perovskites. We show, for the first time, the energy band structure, charge recombination, and transport properties of CH3NH3PbCl3 single crystals. These crystals exhibit trap-state density, charge carrier concentration, mobility, and diffusion length comparable with the best quality crystals of methylammonium lead iodide or bromide perovskites reported so far. The high quality of the crystal along with its suitable optical band gap enabled us to build an efficient visible-blind UV-photodetector, demonstrating its potential in optoelectronic applications.
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Affiliation(s)
- Giacomo Maculan
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Arif D Sheikh
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ahmed L Abdelhady
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
- Department of Chemistry, Faculty of Science, Mansoura University , Mansoura, 35516, Egypt
| | - Makhsud I Saidaminov
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Md Azimul Haque
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Banavoth Murali
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Erkki Alarousu
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Tom Wu
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia
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27
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Saidaminov MI, Abdelhady AL, Murali B, Alarousu E, Burlakov VM, Peng W, Dursun I, Wang L, He Y, Maculan G, Goriely A, Wu T, Mohammed OF, Bakr OM. High-quality bulk hybrid perovskite single crystals within minutes by inverse temperature crystallization. Nat Commun 2015; 6:7586. [PMID: 26145157 PMCID: PMC4544059 DOI: 10.1038/ncomms8586] [Citation(s) in RCA: 578] [Impact Index Per Article: 64.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 05/21/2015] [Indexed: 01/20/2023] Open
Abstract
Single crystals of methylammonium lead trihalide perovskites (MAPbX3; MA=CH3NH3+, X=Br− or I−) have shown remarkably low trap density and charge transport properties; however, growth of such high-quality semiconductors is a time-consuming process. Here we present a rapid crystal growth process to obtain MAPbX3 single crystals, an order of magnitude faster than previous reports. The process is based on our observation of the substantial decrease of MAPbX3 solubility, in certain solvents, at elevated temperatures. The crystals can be both size- and shape-controlled by manipulating the different crystallization parameters. Despite the rapidity of the method, the grown crystals exhibit transport properties and trap densities comparable to the highest quality MAPbX3 reported to date. The phenomenon of inverse or retrograde solubility and its correlated inverse temperature crystallization strategy present a major step forward for advancing the field on perovskite crystallization. Hybrid perovskites are a promising class of materials for photovoltaic applications. Here, addressing the need for high-quality hybrid perovskite materials, the authors achieve the rapid growth of hybrid perovskite single crystals of high quality by inverse temperature crystallization.
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Affiliation(s)
- Makhsud I Saidaminov
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ahmed L Abdelhady
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia.,Department of Chemistry, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
| | - Banavoth Murali
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Erkki Alarousu
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Victor M Burlakov
- Mathematical Institute, University of Oxford, Woodstock Road, Oxford OX2 6GG, UK
| | - Wei Peng
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ibrahim Dursun
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Lingfei Wang
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Yao He
- Imaging and Characterization Lab, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Giacomo Maculan
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Alain Goriely
- Mathematical Institute, University of Oxford, Woodstock Road, Oxford OX2 6GG, UK
| | - Tom Wu
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
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Murali B, Krupanidhi SB. Nanocomposite Based Organic-Inorganic Cu3BiS3 High Sensitive Hybrid Photonic Devices. J Nanosci Nanotechnol 2015; 15:2742-2752. [PMID: 26353488 DOI: 10.1166/jnn.2015.8725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the synthesis and application Cu3BiS3 nanorods in infrared photodectection. Cu3BiS3 nano rods were characterized structurally, optically and electrically. The detailed IR photodectection properties in terms of photo response were demonstrated with IR lamp and 1064 nm laser illuminations. The rapid photocurrent time constants followed by the slower components, resulting due to the defect states. The photo detecting properties for different concentrations of nanorods blended with the conjugate polymer devices were demonstrated. Further the photocurrent was enhanced to threefold increase from 3.47 x 10(-7) A to 2.37 x 10(-3) A at 1 V for 10 mg nanorods embedded in the polymer device. Responsivity of hybrid device was enhanced from 0.0158 A/W to 102 A/W. The detailed trap assisted space charge transport properties were studied considering the different regimes. Hence Cu3BiS3 can be a promising candidate in the nano switchable near IR photodetectors.
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Abstract
CuIn(1-x)Al(x)Se2 (CIASe) thin films were grown by a simple sol-gel route followed by annealing under vacuum. Parameters related to the spin-orbit (ΔSO) and crystal field (ΔCF) were determined using a quasi-cubic model. Highly oriented (002) aluminum doped (2%) ZnO, 100 nm thin films, were co-sputtered for CuIn(1-x)Al(x)Se2/AZnO based solar cells. Barrier height and ideality factor varied from 0.63 eV to 0.51 eV and 1.3186 to 2.095 in the dark and under 1.38 A.M 1.5 solar illumination respectively. Current-voltage characteristics carried out at 300 K were confined to a triangle, exhibiting three limiting conduction mechanisms: Ohms law, trap-filled limit curve and SCLC, with 0.2 V being the cross-over voltage, for a quadratic transition from Ohm's to Child's law. Visible photodetection was demonstrated with a CIASe/AZO photodiode configuration. Photocurrent was enhanced by one order from 3 × 10(-3) A in the dark at 1 V to 3 × 10(-2) A upon 1.38 sun illumination. The optimized photodiode exhibits an external quantum efficiency of over 32% to 10% from 350 to 1100 nm at high intensity 17.99 mW cm(-2) solar illumination. High responsivity Rλ ~ 920 A W(-1), sensitivity S ~ 9.0, specific detectivity D* ~ 3 × 10(14) Jones, make CIASe a potential absorber for enhancing the forthcoming technological applications of photodetection.
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Affiliation(s)
- Banavoth Murali
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, India.
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Chandrasekaran CV, Murali B, Deepak M, Agarwal A. In vitro comparative evaluation of non-leaves and leaves extracts of Andrographis paniculata on modulation of inflammatory mediators. Antiinflamm Antiallergy Agents Med Chem 2013; 11:191-7. [PMID: 22882083 DOI: 10.2174/187152312803305731] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Revised: 07/02/2012] [Accepted: 07/09/2012] [Indexed: 11/22/2022]
Abstract
This study was designed to evaluate and compare the inhibitory property of extracts of Andrographis paniculata leaves [methanolic (AP1), hydroalcoholic (AP2), successive water (AP3)] and non-leaves [methanolic (AP4), hydroalcoholic (AP5), successive water (AP6)] towards inflammatory mediators (NO, IL-1 beta, IL-6, TNF alpha, PGE2, TXB2 and LTB4). Stimulant induced J774A.1 murine macrophages and HL-60 promyelocytic leukemic cells were used to study the inhibitory potential of extracts of A. paniculata on inflammatory mediators. Results revealed that AP1 and AP4 exhibited inhibitory effect on all the inflammatory mediators excluding PGE2 and TNF-alpha. AP2 and AP5 exhibited inhibitory effect towards IL-1 beta, TXB2 and did not show inhibitory effect towards other mediators. However, AP3 and AP6 failed to show inhibitory activity against any of the inflammatory mediators at the tested concentrations. Further, we observed that the magnitude of inhibitory effect displayed by A. paniculata extracts depends on the andrographolide content, although, it does not appear to influence the inhibitory effect towards LTB4 production.
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Murali B, Krupanidhi SB. Tailoring the band gap and transport properties of Cu3BiS3 nanopowders for photodetector applications. J Nanosci Nanotechnol 2013; 13:3901-3909. [PMID: 23862425 DOI: 10.1166/jnn.2013.7133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report a facile route to synthesize high quality earth abundant absorber Cu3BiS3, tailoring the band gap with the morphology manipulation and thereby analyzed the secondary phases and their role in the transport property. The sample at 48 hours reaction profile showed good semiconducting behavior, whereas other samples showed mostly a metallic behavior. Band gap was varied from 1.86 eV to 1.42 eV upon controling the reaction profile from 8 hours to 48 hours. The activation energy was calculated to be 0.102 eV. The temperature coefficient of resistance (TCR) was found to be 0.03432 K(-1) at 185 K. The IR photodectection properties in terms of photoresponse have been demonstrated. The high internal gain (G = 3.7 x 10(4)), responsivity (R = 3.2 x 10(4) A W(-1)) for 50 mW cm(-2) at 5 V make Cu3BiS3, an alternative potential absorber in meliorating the technological applications as near IR photodetectors.
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Affiliation(s)
- Banavoth Murali
- Materials Research Center, Indian Institute of Science, Bangalore 560012, India
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Murali B, Parui J, Chandan KG, Mayoori A, Krupanidhi SB. Synthesis of CuS Nanoplates and Self-Assembled Hierarchical Architectures by Solvothermal Method. ACTA ACUST UNITED AC 2013. [DOI: 10.1166/asem.2013.1231] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Praveen K, Streiner N, Ruiz-Lorroya T, Garg M, Murali B, Hoffmaster S, Vo M, Broudy T, Mirsaidi C. 190 Patient-derived Tumor Xenografts in Combination with High Content Imaging Platform as Models for Oncology Drug Development. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)71988-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Mahender C, Murali B, Venkateshwararao M, priya ES, Ramakrishna S, Himabindu V, Anjaneyulu Y. Synthesis of titanium nanorods with LPG as fuel and oxygen as oxidant in diffusion flame reactor. J IND ENG CHEM 2012. [DOI: 10.1016/j.jiec.2012.06.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Murali B, Venugopal R, Chandan KG, Krupanidhi SB. Solvothermal Synthesis, Structural and Optical Properties of Phase-Pure Cu 3BiS 3 Nano-Powders Exhibiting Near-IR Photodetection. ACTA ACUST UNITED AC 2012. [DOI: 10.1166/asem.2012.1142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chandrasekaran C, Thiyagarajan P, Sundarajan K, Goudar KS, Deepak M, Murali B, Joshua Allan J, Agarwal A. Evaluation of the genotoxic potential and acute oral toxicity of standardized extract of Andrographis paniculata (KalmCold™). Food Chem Toxicol 2009; 47:1892-902. [DOI: 10.1016/j.fct.2009.05.006] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2009] [Revised: 04/07/2009] [Accepted: 05/06/2009] [Indexed: 11/29/2022]
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Allan JJ, Pore MP, Deepak M, Murali B, Mayachari AS, Agarwal A. Reproductive and Fertility Effects of an Extract of Andrographis paniculata in Male Wistar Rats. Int J Toxicol 2009; 28:308-17. [DOI: 10.1177/1091581809339631] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The possible effect of extract of Andrographis paniculata Nees ( A paniculata) standardized to ≥10% andrographolide, the main bioactive component, on male fertility in albino Wistar rats was evaluated, by orally administering 0, 20, 200, and 1000 mg/kg of body weight per day, for 65 days prior to mating and 21 days during mating. The treated groups showed no signs of dose-dependent toxicity. The body weight gain and feed consumption were not affected at any of the dose levels. The testosterone levels and fertility indices in treatment groups were found to be comparable with that of the control indicating no effect on fertility. Total sperm count and sperm motility were not affected. The testes and epididymides did not show any gross and histopathological changes. Based on these findings, it can be concluded that the no-observed adverse effect level of extract of A paniculata (≥10% andrographolide) was found to be more than 1000 mg/kg per day.
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Affiliation(s)
- J. Joshua Allan
- From the Natural Remedies Pvt Ltd, Bangalore, India (JJA, MD, BM, ASM, AA); and Intox Pvt Ltd, Pune, India (MP)
| | - Mukul P. Pore
- From the Natural Remedies Pvt Ltd, Bangalore, India (JJA, MD, BM, ASM, AA); and Intox Pvt Ltd, Pune, India (MP)
| | - M. Deepak
- From the Natural Remedies Pvt Ltd, Bangalore, India (JJA, MD, BM, ASM, AA); and Intox Pvt Ltd, Pune, India (MP)
| | - B. Murali
- From the Natural Remedies Pvt Ltd, Bangalore, India (JJA, MD, BM, ASM, AA); and Intox Pvt Ltd, Pune, India (MP)
| | - Anand S. Mayachari
- From the Natural Remedies Pvt Ltd, Bangalore, India (JJA, MD, BM, ASM, AA); and Intox Pvt Ltd, Pune, India (MP)
| | - Amit Agarwal
- From the Natural Remedies Pvt Ltd, Bangalore, India (JJA, MD, BM, ASM, AA); and Intox Pvt Ltd, Pune, India (MP)
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Sivasubramaniam S, Murali B, Smallpiece CJ, Smith B, Kalkat M. Intraoperative coronary vein graft thrombosis: should we blame the use of aprotinin? Ann Card Anaesth 2009; 12:84-6. [PMID: 19136764 DOI: 10.4103/0971-9784.45022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Deb DD, Kapoor P, Dighe RP, Padmaja R, Anand MS, D'Souza P, Deepak M, Murali B, Agarwal A. In vitro safety evaluation and anticlastogenic effect of BacoMind on human lymphocytes. Biomed Environ Sci 2008; 21:7-23. [PMID: 18478974 DOI: 10.1016/s0895-3988(08)60002-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
OBJECTIVE BacoMind (BM) is a standardized extract of Bacopa monnieri, which belongs to the family Scrophulariaceae and is a creeping annual plant found throughout the Indian subcontinent. It has been used by Ayurvedic medicinal practitioners in India for almost 3000 years and is classified as a medharasayana, a substance which improves memory and intellect. With the widespread traditional use as well as scientific validation of Bacopa monnieri for nootropic activity, a bioactive-rich unique phytochemical composition-BacoMind was developed from B. monnieri for use as a cognition and memory enhancing agent. The present study aimed to investigate the in vitro toxicity of this formulation of BacoMind on human lymphocytes and to rule out its possible contribution to mutagenicity. METHODS In the present investigation the active ingredients present in BM were identified and quantified by high performance liquid chromatography (HPLC) and high performance thin-layer chromatography (HPTLC). Antioxidant and anticlastogenic properties of BM were studied in vitro with and without metabolic activation. Doses of BM were chosen on the basis of mitotic index (MI) and cytokinesis-block proliferation index (CBPI). Clastogenicity assays were performed at 31.2 microg/mL, 62.5 microg/mL, and 125 microg/mL, while the Salmonella reverse mutation assay (Ames test) was performed at doses of 61.72, 185.18, 555.55, 1666.67, and 5000.00 microg/plate. RESULTS HPLC and HPTLC analysis of BM revealed the presence of bacoside A3, bacopaside I, bacopaside II, jujubogenin isomer of bacopasaponin C, bacosine, luteolin, apigenin, bacosine, and beta-sitosterol D glucoside. BM demonstrated significant antioxidant activity. The number of chromosomal aberrations and the frequency of micronuclei induced by BM were not statistically significant up to a dose of 62.5 microg/mL. A subsequent dose of 125 microg/mL prior to metabolic activation induced mild clastogenicity, but it was found to be biologically insignificant as this effect was not seen post metabolic activation. BM also demonstrated a dose-dependent protection against the clastogens used in this study using the above tests for clastogenicity. Maximum protection was observed in presence of metabolic activation. Moreover, BM demonstrated no mutagenic effect on the tested strains, as observed in the Ames test. CONCLUSION BM protected human lymphocytes against various clastogens. BM also exhibited high antioxidant activity which might be responsible for the observed protective effects against the clastogens since the used clastogens are known to induce their clastogenic effects via production of oxidative radicals.
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Affiliation(s)
- Dlpanwita Dutta Deb
- Natural Remedies Pvt. Ltd, 19 K. M. Stone, Hosur Road, Plot No. 5B Veerasandra Indl. Area Bangalore 560100, India.
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Revadigar V, Shashidhara S, Pradeep N, Murali B, Rajasekharan P, Prakashkumar R. VARIABILITY IN THE CHEMICAL CONSTITUENTS IN THE ROOTS OF COLEUS FORSKOHLII FROM DIFFERENT GEOGRAPHICAL REGIONS OF INDIA. ACTA ACUST UNITED AC 2008. [DOI: 10.17660/actahortic.2008.765.30] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Murali B, Korrapati MC, Warbritton A, Latendresse JR, Mehendale HM. Tolerance of aged Fischer 344 rats against chlordecone-amplified carbon tetrachloride toxicity. Mech Ageing Dev 2004; 125:421-35. [PMID: 15178132 DOI: 10.1016/j.mad.2004.03.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2003] [Revised: 02/27/2004] [Accepted: 03/01/2004] [Indexed: 01/11/2023]
Abstract
We have investigated the effects of chlordecone 1(CD)+CCl4 combination in adult (3 months), middle aged (14 months), and old aged (24 months) male Fischer 344 (F344) rats. After a non-toxic dietary regimen of CD (10 ppm) or normal powdered diet for 15 days, rats received a single non-toxic dose of CCl4 (100 microl/kg, i.p., 1:4 in corn oil) or corn oil (500 microl/kg, i.p.) alone on day 16. Liver injury was assessed by plasma ALT, AST, and histopathology during a time course of 0-96 h. Liver tissue repair was measured by [3H-CH3]-thymidine (3H-T) incorporation into hepatic nuclear DNA and proliferating cell nuclear antigen (PCNA) immunohistochemistry. Hepatomicrosomal CYP2E1 protein, enzyme activity, and covalent binding of 14CCl4-derived radiolabel were measured in normal and CD fed rats. Exposure to CCl4 alone caused modest liver injury only in 14- and 24-month-old rats but neither progression of injury nor mortality. The CD+CCl4 combination led to 100% mortality in 3-month-old rats by 72 h, whereas none of the 14- and 24-month-old rats died. Both 3- and 14-month-old rats exposed to CD+Cl4 had identical liver injury up to 36 h indicating that bioactivation-mediated CCl4 injury was the same in the two age groups. Thereafter, liver injury escalated only in 3-month-old while it declined in 14-month-old rats. In 24-month-old rats initial liver injury at 6 h was similar to the 3- and 14-month-old rats and thereafter did not develop to the level of the other two age groups, recovering from injury by 96 h as in the 14-month-old rats. Neither hepatomicrosomal CYP2E1 protein nor the associated p-nitrophenol hydroxylase activity or covalent binding of 14CCl4-derived radiolabel to liver tissue differed between the age groups or diet regimens 2 h after the administration of 14CCl4. Compensatory liver tissue repair (3H-T, PCNA) was prompt and robust soon after CCl4 liver injury in the 14- and 24-month-old rats. In stark contrast, in the 3-month-old rats it failed allowing unabated progression of liver injury. These findings suggest that stimulation of early onset and robust liver tissue repair rescue the 14- and 24-month-old F344 rats from the lethal effect of the CD+CCl4 combination.
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Affiliation(s)
- B Murali
- Department of Toxicology, Sugar Hall #306, School of Pharmacy, College of Health Sciences, The University of Louisiana at Monroe, 700 University Avenue, Monroe, LA 71209, USA
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Abstract
We present a case of pulmonary thromboendarterectomy performed successfully in a patient with stomatocytosis. Stomatocytosis is a rare condition of abnormal erythrocyte morphology in which haemolysis and hyperkalaemia occur at cooler temperatures. A 35-yr-old male with stomatocytosis was referred for pulmonary thromboendarterectomy in the context of chronic thromboembolic pulmonary hypertension. He had undergone splenectomy as a child, which rendered him hypercoagulable as the spleen normally removes the haemolysed red cell fragments from blood. By constantly monitoring urine for macroscopic haematuria, arterial and mixed venous blood gas analysis perioperatively and by limiting the period of deep hypothermic circulatory arrest that is normally required for this operation, we were able to perform the operation successfully.
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Affiliation(s)
- B Murali
- Department of Cardiothoracic Anaesthesia, Papworth Hospital, Cambridge CB3 8RE, UK
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Murali B, Umrani DN, Goyal RK. Effect of chronic treatment with losartan on streptozotocin-induced renal dysfunction. Mol Cell Biochem 2003; 249:85-90. [PMID: 12956402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
The present investigation was undertaken to study the effect of chronic treatment with angiotensin (AT1) receptor antagonist losartan (2 mg/kg, p.o., 6 weeks) on streptozotocin (STZ) induced (45 mg/kg, i.v., single dose) renal dysfunctions in diabetic rats. Injection of streptozotocin produced not only the cardinal symptoms of diabetes mellitus like loss of body weight, hyperglycemia, and hypoinsulinemia but also the renal dysfunctions. Losartan treatment significantly prevented all these changes except STZ-induced hypoinsulinemia. There was a significant elevation of blood pressure in diabetic rats and treatment with losartan significantly brought it back to normal. Renal dysfunction in diabetic rats was characterized by a significant decrease in creatinine clearance, elevated levels of electrolytes and renal hypertrophy. Treatment with losartan prevented these changes. A good correlation was found between biochemical parameters and histopathological abnormalities. Our data suggests that, losartan may be considered as the drug of choice when there is a co-existence of diabetes mellitus and hypertension with compromised kidney function.
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Affiliation(s)
- B Murali
- Department of Pharmacology, L.M. College of Pharmacy, Ahmedabad, India
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Murali B, Vuylsteke A, Latimer RD. Anaesthetic management of the multi-organ donor. Ann Card Anaesth 2003; 6:31-4. [PMID: 17827589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023] Open
Affiliation(s)
- B Murali
- Department of Anaesthetics, Papworth Hospital, Cambridge, UK
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Murali B, Upadhyaya UM, Goyal RK. Effect of chronic treatment with Enicostemma littorale in non-insulin-dependent diabetic (NIDDM) rats. J Ethnopharmacol 2002; 81:199-204. [PMID: 12065151 DOI: 10.1016/s0378-8741(02)00077-6] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We have studied the effect of aqueous extract of Enicostemma. littorale (2 g/kg p.o.) daily for 6 weeks in neonatal non-insulin-dependent diabetes mellitus (NIDDM) rats. To induce NIDDM a single dose injection of STZ (70 mg/kg; i.p.) was given to the 5-day-old pups. After 3 months of STZ injection when animals were confirmed as diabetic, E. littorale was administered for 6 weeks. Fasting and fed glucose and insulin levels in NIDDM were significantly (P<0.05) higher than control rats and they were significantly decreased by the treatment with E. littorale. Results of the oral glucose tolerance test (OGTT) showed a significant (P<0.05) decrease in both AUC(glucose) and AUC(insulin) values in NIDDM treated group. Insulin sensitivity (K(ITT)) index of NIDDM control was significantly lower as compared with Wistar control and this was significantly (P<0.05) increased after treatment with E. littorale. Treatment with E. littorale also decreased the elevated cholesterol, triglyceride and creatinine levels observed in NIDDM rats. Our data suggest that aqueous extract of E. littorale is a potent herbal antidiabetic. It produces an increase in insulin sensitivity, normalizes dyslipidaemia and provides nephroprotection in diabetic rats.
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Affiliation(s)
- B Murali
- Department of Pharmacology, L. M. College of Pharmacy, Ahmedabad 380 009, India
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Murali B, Prabhu M, Kitcat J, Charman S, Vuylsteke A, Latimer R. Crit Care 2002; 6:5. [DOI: 10.1186/cc1809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Murali B, Goyal RK. Effect of chronic treatment with losartan on streptozotocin induced diabetic rats. Indian J Exp Biol 2002; 40:31-4. [PMID: 12561964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
Treatment of rats with streptozotocin (STZ, 45mg/kg, i.v.,single dose) produced cardinal symptoms of diabetes mellitus including hyperglycemia, hypoinsulinemia and increase in blood pressure. Treatment with losartan--an angiotensin (AT1) receptor antagonist, 2 mg/kg, po for 6 weeks decreased the blood glucose levels by 16.5%. There was 190% increase in AUCglucose and 59.4% decrease in AUCinsulin in STZ-diabetic rats as compared to control rats. Treatment with losartan caused slight decrease in AUCglucose and slight increase in AUCinsulin. There was no significant difference in insulin sensitivity (K(ITT)) index of STZ-diabetic group as compared to control. Losartan treatment failed to alter these levels significantly. Serum cholesterol and creatinine levels were found to be increased significantly in STZ-diabetic rats. Treatment with losartan significantly prevented the rise in cholesterol and creatinine levels by 20.1 and 81% respectively. The results suggest that losartan produces some beneficial effects in STZ-diabetic rats.
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Affiliation(s)
- B Murali
- Department of Pharmacology, L. M. College of Pharmacy, Ahmedabad, 380 009, India
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Abstract
The present investigation was undertaken to study the effects of chronic treatment with losartan (2 mg kg(-1)/ day P.O) in neonatal non-insulin-dependent diabetes mellitus (NIDDM) rats. To induce NIDDM single-dose injection of STZ (70 mg kg(-1); i.p.) was given to 5 day old pups. The animals were weaned at 30 days and after a period of 3 months, they were checked for fasting and fed glucose levels to confirm the status of NIDDM. Losartan (2 mg kg(-1); p.o.) was administered for 6 weeks into the confirmed diabetic rats. A group of control animals were also maintained and this group received saline 5 days after birth. Fasting and fed glucose levels in NIDDM rats were significantly higher than control rats. Treatment with losartan in the NIDDM rats caused a significant decrease in insulin levels and reduction in elevated fasting and fed glucose levels. Results of the oral glucose tolerance test (OGTT) showed a significant increase in AUC(glucose)and AUC(insulin)values in NIDDM control rats. Losartan treatment significantly decreased both AUC(glucose)and AUC(insulin)values. Insulin sensitivity (K(ITT)) index of NIDDM control was significantly low as compared to Wistar control animals followed by significant increase in T(1/2)glucose value. Losartan treatment significantly reversed both K(ITT)and T(1/2)glucose value. Our data indicates that losartan increases insulin sensitivity in NIDDM rats.
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Affiliation(s)
- B Murali
- Department of Pharmacology, L. M. College of Pharmacy, Ahmedabad 380 009, India
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Abstract
Angiotensin converting enzyme (ACE) inhibitors produce a number of beneficial effects in a condition where diabetes - mellitus and hypertension co-exist. The present investigation was undertaken to study the effect of chronic treatment with losartan (2mg/kg, p.o.) on streptozotocin (STZ)-induced (45mg/kg, single dose, tail vein) diabetic nephropathy in rats. Treatment of rats with STZ produced a significant loss of body weight, polyuria. polydipsia, hypoinsulinemia, hyperglycemia and increase in blood pressure. There was a significant increase in blood glucose levels in STZ-diabetic rats. Serum cholesterol, creatinine, urea and blood urea nitrogen (BUN) levels were found to be increased significantly in the STZ group diabetic rats. Treatment with losartan significantly prevented the raise in cholesterol, creatinine, urea and blood urea nitrogen levels. Creatinine clearance was significantly less in STZ-diabetic rats as compared to control animals and treatment with losartan significantly increased creatinine clearence. Our data suggest a beneficial effect of losartan in STZ-induced nephropathy in rats.
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Affiliation(s)
- B Murali
- Department of Pharmacology, L. M. College of Pharmacy, Ahmedabad, India
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