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Cao K, Yu B, Huang F, Pan Q, Wang J, Ning J, Zheng K, Pullerits T, Tian J. Constructing ZnTe Spherical Quantum Well for Efficient Light Emission. Nano Lett 2024; 24:5238-5245. [PMID: 38629707 DOI: 10.1021/acs.nanolett.4c00734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
ZnTe colloidal semiconductor nanocrystals (NCs) have shown promise for light-emitting diodes (LEDs) and displays, because they are free from toxic heavy metals (Cd). However, so far, their low photoluminescence (PL) efficiency (∼30%) has hindered their applications. Herein, we devised a novel structure of ZnTe NCs with the configuration of ZnSe (core)/ZnTe (spherical quantum well, SQW)/ZnSe (shell). The inner layer ZnTe was grown at the surface of ZnSe core with avoiding using highly active and high-risk Zn sources. Due to the formation of coherently strained heterostructure which reduced the lattice mismatch, and the thermodynamic growth of ZnTe, the surface or interface defects were suppressed. A high PL efficiency of >60% was obtained for the green light-emitting ZnSe/ZnTe/ZnSe SQWs after ZnS outer layer passivation, which is the highest value for colloidal ZnTe-based NCs. This work paves the way for the development of novel semiconductor NCs for luminescent and display applications.
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Affiliation(s)
- Kequan Cao
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Binbin Yu
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Fei Huang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Qinying Pan
- Chemical Physics and NanoLund, Lund University, 22100 Lund, Sweden
| | - Junfeng Wang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Jiajia Ning
- College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Kaibo Zheng
- Chemical Physics and NanoLund, Lund University, 22100 Lund, Sweden
| | - Tõnu Pullerits
- Chemical Physics and NanoLund, Lund University, 22100 Lund, Sweden
| | - Jianjun Tian
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
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2
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Hedse A, Kalaee AAS, Wacker A, Pullerits T. Pulse overlap artifacts and double quantum coherence spectroscopy. J Chem Phys 2023; 158:141104. [PMID: 37061484 DOI: 10.1063/5.0146148] [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: 04/17/2023] Open
Abstract
The double quantum coherence (DQC) signal in nonlinear spectroscopy gives information about the many-body correlation effects not easily available by other methods. The signal is short-lived, consequently, a significant part of it is generated during the pulse overlap. Since the signal is at two times the laser frequency, one may intuitively expect that the pulse overlap-related artifacts are filtered out by the Fourier transform. Here, we show that this is not the case. We perform explicit calculations of phase-modulated two-pulse experiments of a two-level system where the DQC is impossible. Still, we obtain a significant signal at the modulation frequency, which corresponds to the DQC, while the Fourier transform over the pulse delay shows a double frequency. We repeat the calculations with a three-level system where the true DQC signal occurs. We conclude that with realistic dephasing times, the pulse-overlap artifact can be significantly stronger than the DQC signal. Our results call for great care when analyzing such experiments. As a rule of thumb, we recommend that only delays larger than 1.5 times the pulse length should be used.
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Affiliation(s)
- Albin Hedse
- Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | | | - Andreas Wacker
- Mathematical Physics and NanoLund, Lund University, P.O. Box 118, 22100 Lund, Sweden
| | - Tõnu Pullerits
- Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
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3
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Finkelstein-Shapiro D, Mante PA, Balci S, Zigmantas D, Pullerits T. Non-Hermitian Hamiltonians for linear and nonlinear optical response: A model for plexcitons. J Chem Phys 2023; 158:104104. [PMID: 36922135 DOI: 10.1063/5.0130287] [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: 03/18/2023] Open
Abstract
In polaritons, the properties of matter are modified by mixing the molecular transitions with light modes inside a cavity. Resultant hybrid light-matter states exhibit energy level shifts, are delocalized over many molecular units, and have a different excited-state potential energy landscape, which leads to modified exciton dynamics. Previously, non-Hermitian Hamiltonians have been derived to describe the excited states of molecules coupled to surface plasmons (i.e., plexcitons), and these operators have been successfully used in the description of linear and third order optical response. In this article, we rigorously derive non-Hermitian Hamiltonians in the response function formalism of nonlinear spectroscopy by means of Feshbach operators and apply them to explore spectroscopic signatures of plexcitons. In particular, we analyze the optical response below and above the exceptional point that arises for matching transition energies for plasmon and molecular components and study their decomposition using double-sided Feynman diagrams. We find a clear distinction between interference and Rabi splitting in linear spectroscopy and a qualitative change in the symmetry of the line shape of the nonlinear signal when crossing the exceptional point. This change corresponds to one in the symmetry of the eigenvalues of the Hamiltonian. Our work presents an approach for simulating the optical response of sublevels within an electronic system and opens new applications of nonlinear spectroscopy to examine the different regimes of the spectrum of non-Hermitian Hamiltonians.
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Affiliation(s)
| | - Pierre-Adrien Mante
- Division of Chemical Physics and Nanolund, Lund University, Box 124, 221 00 Lund, Sweden
| | - Sinan Balci
- Department of Photonics, Izmir Institute of Technology, 35430 Izmir, Türkiye
| | - Donatas Zigmantas
- Division of Chemical Physics and Nanolund, Lund University, Box 124, 221 00 Lund, Sweden
| | - Tõnu Pullerits
- Division of Chemical Physics and Nanolund, Lund University, Box 124, 221 00 Lund, Sweden
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4
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Ghosh S, Pradhan B, Lin W, Zhang Y, Leoncino L, Chabera P, Zheng K, Solano E, Hofkens J, Pullerits T. Slower Auger Recombination in 12-Faceted Dodecahedron CsPbBr 3 Nanocrystals. J Phys Chem Lett 2023; 14:1066-1072. [PMID: 36696665 DOI: 10.1021/acs.jpclett.2c03389] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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
Over the past two decades, intensive research efforts have been devoted to suppressions of Auger recombination in metal-chalcogenide and perovskite nanocrystals (PNCs) for the application of photovoltaics and light emitting devices (LEDs). Here, we have explored dodecahedron cesium lead bromide perovskite nanocrystals (DNCs), which show slower Auger recombination time compared to hexahedron nanocrystals (HNCs). We investigate many-body interactions that are manifested under high excitation flux density in both NCs using ultrafast spectroscopic pump-probe measurements. We demonstrate that the Auger recombination rate due to multiexciton recombinations are lower in DNCs than in HNCs. At low and intermediate excitation density, the majority of carriers recombine through biexcitonic recombination. However, at high excitation density (>1018 cm-3) a higher number of many-body Auger process dominates over biexcitonic recombination. Compared to HNCs, high PLQY and slower Auger recombinations in DNCs are likely to be significant for the fabrication of highly efficient perovskite-based photonics and LEDs.
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Affiliation(s)
- Supriya Ghosh
- The Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100Lund, Sweden
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio43210, United States
| | - Bapi Pradhan
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001Heverlee, Belgium
| | - Weihua Lin
- The Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100Lund, Sweden
| | - Yiyue Zhang
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001Heverlee, Belgium
| | - Luca Leoncino
- Electron Microscopy Facility, Istituto Italiano di Tecnologia, via Morego 30, Genova16163, Italy
| | - Pavel Chabera
- The Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100Lund, Sweden
| | - Kaibo Zheng
- The Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100Lund, Sweden
| | - Eduardo Solano
- NCD-SWEET Beamline, ALBA Synchrotron Light Source, Cerdanyola del Vallès, Barcelona, 08290Spain
| | - Johan Hofkens
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001Heverlee, Belgium
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Tõnu Pullerits
- The Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100Lund, Sweden
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5
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Wang X, Wang H, Zhang M, Pullerits T, Song P. External electric field-dependent photoinduced charge transfer in non-fullerene organic solar cells. Spectrochim Acta A Mol Biomol Spectrosc 2023; 284:121763. [PMID: 36063736 DOI: 10.1016/j.saa.2022.121763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 08/06/2022] [Accepted: 08/11/2022] [Indexed: 06/15/2023]
Abstract
Based on Marcus theory, the photoinduced electron transfer properties of D-A type non-fullerene acceptor organic solar cells (OSCs) under the dependence of external electric field (Fext) were investigated. The research results shown that the charge transfer mode under different Fext intensities changes with certain regularity. Focusing on the important parameters (ΔG, λ, and VDA) that affect the charge transfer rate, it was found that both charge separation (|ΔGCS|>λ(1.3019 vs 0.8275 eV at Fext = 0) and charge recombiation (|ΔGCR|>λ, (1.9633 vs 0.8275 eV)) processes occur in the Marcus inverted region. The ΔGCS is relatively sensitive to Fext, and the calculated ΔGCS at different Fext intensities yields an increment of 0.0073 eV, which is also the main reason for the increase in the rate of charge separation. The ΔGCR ranges between -1.9633 and -1.9637 eV, is insensitive to Fext, and ΔGCR is significantly smaller than ΔGCS, which makes the charge recombination rate significantly smaller than the charge separation rate. For VDA, it is found that VDA will transition to a new level only when the Fext intensity reaches a certain intensity, which also enables to obtain a faster charge separation rate. By studying the charge transfer parameters in different polar solvents, it is found that polar solvents can indeed increase the charge transfer rate. To a certain extent, our results also demonstrate that the addition of Fext can further improve the performance of non-fullerene acceptor OSCs.
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Affiliation(s)
- Xinyue Wang
- College of Physics, Liaoning University, Shenyang 110036, China
| | - Hongxiang Wang
- College of Physics, Liaoning University, Shenyang 110036, China
| | - Meixia Zhang
- College of Physics, Liaoning University, Shenyang 110036, China
| | - Tõnu Pullerits
- Department of Chemical Physics, Lund University, Box 124, Lund 22100, Sweden.
| | - Peng Song
- College of Physics, Liaoning University, Shenyang 110036, China.
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6
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Wu Y, Chen J, Zheng D, Xia X, Yang S, Yang Y, Chen J, Pullerits T, Han K, Yang B. Organo-Metal Halide Scintillator with Weak Thermal Quenching Up to 200 °C. J Phys Chem Lett 2022; 13:5794-5800. [PMID: 35726880 DOI: 10.1021/acs.jpclett.2c01573] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The prominent thermal quenching (TQ) effect of organic-inorganic metal halides limits their applications for lighting and imaging. Herein, we report an organo-metal halide scintillator (TTPhP)2MnCl4 (TTPhP+ = tetraphenylphosphonium cation), which exhibits a weak TQ effect up to 200 °C under ultraviolet-visible light (efficiency loss of 5.5%) and X-ray radiation (efficiency loss of 37%). The light yield of the (TTPhP)2MnCl4 scintillator (37 000 photons MeV-1 at 200 °C) under X-ray radiation is >2 times that of the commercial scintillator LuAG:Ce (15 000 photons MeV-1 at 200 °C). The microscopic mechanism of the weak TQ effect is demonstrated to be the scintillator having the ability to compensate for the emission losses from trapped charges and the large Mn-Mn distance (10.233 Å) suppressing nonradiative recombination at high temperatures. We further demonstrate the applications of (TTPhP)2MnCl4 as high-power white-light-emitting diodes operated at currents of ≤300 mA and X-ray imaging at 200 °C with a high spatial resolution.
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Affiliation(s)
- Yanqing Wu
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China
- University of the Chinese Academy of Sciences, Beijing 100039, P. R. China
| | - Junsheng Chen
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Daoyuan Zheng
- Institute of Molecular Sciences and Engineering, Shandong University, Qingdao 266237, P. R. China
| | - Xusheng Xia
- General Department of Laser of China Aerospace Science and Industry Corporation, Wuhan 430040, P. R. China
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China
- University of the Chinese Academy of Sciences, Beijing 100039, P. R. China
| | - Yang Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China
- University of the Chinese Academy of Sciences, Beijing 100039, P. R. China
| | - Jiaxin Chen
- Nanjing University of Science and Technology, Nanjing 210094, P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China
- University of the Chinese Academy of Sciences, Beijing 100039, P. R. China
- Institute of Molecular Sciences and Engineering, Shandong University, Qingdao 266237, P. R. China
| | - Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China
- University of the Chinese Academy of Sciences, Beijing 100039, P. R. China
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7
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Wang Z, Lenngren N, Amarotti E, Hedse A, Žídek K, Zheng K, Zigmantas D, Pullerits T. Excited States and Their Dynamics in CdSe Quantum Dots Studied by Two-Color 2D Spectroscopy. J Phys Chem Lett 2022; 13:1266-1271. [PMID: 35089715 PMCID: PMC8842281 DOI: 10.1021/acs.jpclett.1c04110] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 01/21/2022] [Indexed: 06/14/2023]
Abstract
Quantum dots (QDs) form a promising family of nanomaterials for various applications in optoelectronics. Understanding the details of the excited-state dynamics in QDs is vital for optimizing their function. We apply two-color 2D electronic spectroscopy to investigate CdSe QDs at 77 K within a broad spectral range. Analysis of the electronic dynamics during the population time allows us to identify the details of the excitation pathways. The initially excited high-energy electrons relax with the time constant of 100 fs. Simultaneously, the states at the band edge rise within 700 fs. Remarkably, the excited-state absorption is rising with a very similar time constant of 700 fs. This makes us reconsider the earlier interpretation of the excited-state absorption as the signature of a long-lived trap state. Instead, we propose that this signal originates from the excitation of the electrons that have arrived in the conduction-band edge.
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Affiliation(s)
- Zhengjun Wang
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Nils Lenngren
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
- ELI
Beamlines, Institute of Physics, Czech Academy
of Sciences, v.v.i., Za Radnicí 835, 252 41 Dolní Břežany, Czech
Republic
| | - Edoardo Amarotti
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Albin Hedse
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Karel Žídek
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
- Regional
Center for Special Optics and Optoelectronic Systems (TOPTEC), Institute of Plasma Physics of the Czech Academy of
Sciences, 270 00 Prague 8, Czech Republic
| | - Kaibo Zheng
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
- Department
of Chemistry, Technical University of Denmark, DK-2800 Kongens
Lyngby, Denmark
| | - Donatas Zigmantas
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Tõnu Pullerits
- Division
of Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
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8
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Gutiérrez Álvarez S, Lin W, Abdellah M, Meng J, Žídek K, Pullerits T, Zheng K. Charge Carrier Diffusion Dynamics in Multisized Quaternary Alkylammonium-Capped CsPbBr 3 Perovskite Nanocrystal Solids. ACS Appl Mater Interfaces 2021; 13:44742-44750. [PMID: 34515458 PMCID: PMC8461607 DOI: 10.1021/acsami.1c11676] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Indexed: 05/29/2023]
Abstract
CsPbBr3 quantum dots (QDs) are promising candidates for optoelectronic devices. The substitution of oleic acid (OA) and oleylamine (OLA) capping agents with a quaternary alkylammonium such as di-dodecyl dimethyl ammonium bromide (DDAB) has shown an increase in external quantum efficiency (EQE) from 0.19% (OA/OLA) to 13.4% (DDAB) in LED devices. The device performance significantly depends on both the diffusion length and the mobility of photoexcited charge carriers in QD solids. Therefore, we investigated the charge carrier transport dynamics in DDAB-capped CsPbBr3 QD solids by constructing a bi-sized QD mixture film. Charge carrier diffusion can be monitored by quantitatively varying the ratio between two sizes of QDs, which varies the mean free path of the carriers in each QD cluster. Excited-state dynamics of the QD solids obtained from ultrafast transient absorption spectroscopy reveals that the photogenerated electrons and holes are difficult to diffuse among small-sized QDs (4 nm) due to the strong quantum confinement. On the other hand, both photoinduced electrons and holes in large-sized QDs (10 nm) would diffuse toward the interface with the small-sized QDs, followed by a recombination process. Combining the carrier diffusion study with a Monte Carlo simulation on the QD assembly in the mixture films, we can calculate the diffusion lengths of charge carriers to be ∼239 ± 16 nm in 10 nm CsPbBr3 QDs and the mobility values of electrons and holes to be 2.1 (± 0.1) and 0.69 (± 0.03) cm2/V s, respectively. Both parameters indicate an efficient charge carrier transport in DDAB-capped QD films, which rationalized the perfect performance of their LED device application.
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Affiliation(s)
- Sol Gutiérrez Álvarez
- Department
of Chemistry, Technical University of Denmark, DK-2800 Kongens
Lyngby, Denmark
| | - Weihua Lin
- Department
of Chemical Physics and NanoLund Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Mohamed Abdellah
- Department
of Physical Chemistry, Uppsala University, Lägerhyddsvägen 1, 752 37 Uppsala, Sweden
| | - Jie Meng
- Department
of Chemistry, Technical University of Denmark, DK-2800 Kongens
Lyngby, Denmark
| | - Karel Žídek
- The
Research Centre for Special Optics and Optoelectronic Systems (TOPTEC),
Institute of Plasma Physics, Czech Academy
of Sciences v.v.i., Za
Slovankou 1782/3, 182 00 Prague 8, Czech Republic
| | - Tõnu Pullerits
- Department
of Chemical Physics and NanoLund Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Kaibo Zheng
- Department
of Chemistry, Technical University of Denmark, DK-2800 Kongens
Lyngby, Denmark
- Department
of Chemical Physics and NanoLund Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
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9
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Finkelstein-Shapiro D, Mante PA, Sarisozen S, Wittenbecher L, Minda I, Balci S, Pullerits T, Zigmantas D. Understanding radiative transitions and relaxation pathways in plexcitons. Chem 2021. [DOI: 10.1016/j.chempr.2021.02.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Ghosh S, Shi Q, Pradhan B, Mushtaq A, Acharya S, Karki KJ, Pullerits T, Pal SK. Light-Induced Defect Healing and Strong Many-Body Interactions in Formamidinium Lead Bromide Perovskite Nanocrystals. J Phys Chem Lett 2020; 11:1239-1246. [PMID: 31977225 DOI: 10.1021/acs.jpclett.9b03818] [Citation(s) in RCA: 2] [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] [Indexed: 06/10/2023]
Abstract
Organic lead halide perovskite (OLHP) nanocrystals (NCs) have paved the way to advanced optoelectronic devices through their extraordinary electrical and optical properties. However, understanding of the light-induced complex dynamic phenomena in OLHP NCs remains a subject of debate. Here we used wide field microscopy and time-resolved spectroscopy to correlate the local changes in photophysics and the dynamical behavior of photocarriers. We demonstrate that light-induced brightening of the photoluminescence from the formamidinium lead bromide NC films is related to the film preparation condition and reduction of trap density. The density of trap states is reduced via halide ion migration from interstitial position. Our femtosecond transient absorption study identifies transient Stark effect due to the generation of hot carriers. Because of slow carrier trapping, Auger recombination through many-body carrier-carrier interactions dominates over trion recombination. This work presents unprecedented insights into the light-driven processes enabling better device design in the future.
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Affiliation(s)
- Supriya Ghosh
- School of Basic Sciences and Advanced Material Research Center , Indian Institute of Technology Mandi , Kamand, 175005 Himachal Pradesh , India
| | - Qi Shi
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Bapi Pradhan
- School of Applied and Interdisciplinary Sciences , Indian Association for the Cultivation of Science , Jadavpur, Kolkata , 700032 West Bengal , India
| | - Aamir Mushtaq
- School of Basic Sciences and Advanced Material Research Center , Indian Institute of Technology Mandi , Kamand, 175005 Himachal Pradesh , India
| | - Somobrata Acharya
- School of Applied and Interdisciplinary Sciences , Indian Association for the Cultivation of Science , Jadavpur, Kolkata , 700032 West Bengal , India
| | - Khadga J Karki
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Tõnu Pullerits
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Suman Kalyan Pal
- School of Basic Sciences and Advanced Material Research Center , Indian Institute of Technology Mandi , Kamand, 175005 Himachal Pradesh , India
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11
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Affiliation(s)
- Oliver Kühn
- Institute of Physics , University of Rostock , Albert Einstein Strasse 23-24 , 18059 Rostock , Germany
| | - Tomáš Mančal
- Faculty of Mathematics and Physics , Charles University in Prague , Ke Karlovu 5 , CZ-121 16 Prague 2, Czech Republic
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund , Lund University , P.O. Box 124, 22100 Lund , Sweden
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12
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Yu S, Yan Y, Abdellah M, Pullerits T, Zheng K, Liang Z. Nonconfinement Structure Revealed in Dion-Jacobson Type Quasi-2D Perovskite Expedites Interlayer Charge Transport. Small 2019; 15:e1905081. [PMID: 31639286 DOI: 10.1002/smll.201905081] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 09/27/2019] [Indexed: 05/06/2023]
Abstract
Dion-Jacobson (DJ) type 2D perovskites with a single organic cation layer exhibit a narrower distance between two adjacent inorganic layers compared to the corresponding Ruddlesden-Popper perovskites, which facilitates interlayer charge transport. However, the internal crystal structures in 2D DJ perovskites remain elusive. Herein, in a p-xylylenediamine (PDMA)-based DJ perovskite bearing bifunctional NH3 + spacer, the compression from confinement structure (inorganic layer number, n = 1, 2) to nonconfinement structure (n > 3) with the decrease of PDMA molar ratio is unraveled. Remarkably, the nonconfined perovskite displays shorter spacing between 2D quantum wells, which results in a lower exciton binding energy and hence promotes exciton dissociation. The significantly diminishing quantum confinement promotes interlayer charge transport leading to a maximum photovoltaic efficiency of ≈11%. Additionally, the tighter interlayer packing arising from the squeezing of inorganic octahedra gives rise to enhanced ambient stability.
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Affiliation(s)
- Shuang Yu
- Department of Materials Science, Fudan University, Shanghai, 200433, China
| | - Yajie Yan
- Department of Materials Science, Fudan University, Shanghai, 200433, China
| | - Mohamed Abdellah
- Department of Chemistry, Qena Faculty of Science, South Valley University, 83523, Qena, Egypt
- Department of Chemical Physics and NanoLund, Lund University, Box 124, 22100, Lund, Sweden
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Lund University, Box 124, 22100, Lund, Sweden
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Lund University, Box 124, 22100, Lund, Sweden
- Department of Chemistry, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark
| | - Ziqi Liang
- Department of Materials Science, Fudan University, Shanghai, 200433, China
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13
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Skov AB, Ree N, Gertsen AS, Chabera P, Uhlig J, Lissau JS, Nucci L, Pullerits T, Mikkelsen KV, Brøndsted Nielsen M, Sølling TI, Hansen T. Excited‐State Topology Modifications of the Dihydroazulene Photoswitch Through Aromaticity. CHEMPHOTOCHEM 2019. [DOI: 10.1002/cptc.201900182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Anders B. Skov
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Nicolai Ree
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Anders S. Gertsen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
- DTU EnergyTechnical University of Denmark Frederiksborgvej 399 4000 Roskilde Denmark
| | - Pavel Chabera
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Jens Uhlig
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Jonas S. Lissau
- SDU NanoSYD, Mads Clausen InstituteUniversity of Southern Denmark, Alsion 2 6400 Sønderborg Denmark
| | - Luigi Nucci
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
- Dipartimento di Chimica e Chimica IndustrialeUniversitá di Pisa Via Moruzzi 3 Pisa Italy
| | - Tõnu Pullerits
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Kurt V. Mikkelsen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Mogens Brøndsted Nielsen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Theis I. Sølling
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
- King Fahd University of Petroleum and Minerals Bldg. 15, Rm. 6124 Dhahran 31261 Kingdom of Saudi Arabia
| | - Thorsten Hansen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
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14
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Skov AB, Ree N, Gertsen AS, Chabera P, Uhlig J, Lissau JS, Nucci L, Pullerits T, Mikkelsen KV, Brøndsted Nielsen M, Sølling TI, Hansen T. Excited‐State Topology Modifications of the Dihydroazulene Photoswitch Through Aromaticity. CHEMPHOTOCHEM 2019. [DOI: 10.1002/cptc.201900183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anders B. Skov
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Nicolai Ree
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Anders S. Gertsen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
- DTU EnergyTechnical University of Denmark Frederiksborgvej 399 4000 Roskilde Denmark
| | - Pavel Chabera
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Jens Uhlig
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Jonas S. Lissau
- SDU NanoSYD, Mads Clausen InstituteUniversity of Southern Denmark, Alsion 2 6400 Sønderborg Denmark
| | - Luigi Nucci
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
- Dipartimento di Chimica e Chimica IndustrialeUniversitá di Pisa Via Moruzzi 3 Pisa Italy
| | - Tõnu Pullerits
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Kurt V. Mikkelsen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Mogens Brøndsted Nielsen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
| | - Theis I. Sølling
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
- King Fahd University of Petroleum and Minerals Bldg. 15, Rm. 6124 Dhahran 31261 Kingdom of Saudi Arabia
| | - Thorsten Hansen
- Department of ChemistryUniversity of Copenhagen, Universitetsparken 5 2100 Copenhagen Ø Denmark),
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15
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Yan Y, Yu S, Honarfar A, Pullerits T, Zheng K, Liang Z. Benefiting from Spontaneously Generated 2D/3D Bulk-Heterojunctions in Ruddlesden-Popper Perovskite by Incorporation of S-Bearing Spacer Cation. Adv Sci (Weinh) 2019; 6:1900548. [PMID: 31380215 PMCID: PMC6661945 DOI: 10.1002/advs.201900548] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Indexed: 05/09/2023]
Abstract
2D Ruddlesden-Popper (RP) perovskite solar cells have manifested superior operation durability yet inferior charge transport compared to their 3D counterparts. Integrating 3D phases with 2D RP perovskites presents a compromise to maintain respective advantages of both components. Here, the spontaneous generation of 3D phases embedded in 2D perovskite matrix is demonstrated at room temperature via introducing S-bearing thiophene-2-ethylamine (TEA) as both spacer and stabilizer of inorganic lattices. The resulting 2D/3D bulk heterojunction structures are believed to arise from the compression-induced epitaxial growth of the 3D phase at the grain boundaries of the 2D phase through the Pb-S interaction. The as-prepared 2D TEA perovskites exhibit longer exciton diffusion length and extended charge carrier lifetime than the paradigm 2D phenylethylamine (PEA)-based analogues and hence demonstrate an outstanding power conversion efficiency of 7.20% with significantly increased photocurrent. Dual treatments by NH4Cl and dimethyl sulfoxide are further applied to ameliorate the crystallinity and crystal orientation of 2D perovskites. Consequently, TEA-based devices exhibit a stabilized efficiency over 11% with negligible hysteresis and display excellent ambient stability without encapsulation by preserving 80% efficiency after 270 h storage in air with 60 ± 5% relative humidity at 25 °C.
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Affiliation(s)
- Yajie Yan
- Department of Materials ScienceFudan UniversityShanghai200433China
| | - Shuang Yu
- Department of Materials ScienceFudan UniversityShanghai200433China
| | - Alireza Honarfar
- Department of Chemical Physics and NanoLundLund UniversityBox 12422100LundSweden
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLundLund UniversityBox 12422100LundSweden
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLundLund UniversityBox 12422100LundSweden
- Department of ChemistryTechnical University of DenmarkDK‐2800Kongens LyngbyDenmark
| | - Ziqi Liang
- Department of Materials ScienceFudan UniversityShanghai200433China
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16
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Skov AB, Ree N, Gertsen AS, Chabera P, Uhlig J, Lissau JS, Nucci L, Pullerits T, Mikkelsen KV, Brøndsted Nielsen M, Sølling TI, Hansen T. Excited‐State Topology Modifications of the Dihydroazulene Photoswitch Through Aromaticity. CHEMPHOTOCHEM 2019. [DOI: 10.1002/cptc.201900088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Anders B. Skov
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
| | - Nicolai Ree
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
| | - Anders S. Gertsen
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
- DTU EnergyTechnical University of Denmark Frederiksborgvej 399 4000 Roskilde Denmark
| | - Pavel Chabera
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Jens Uhlig
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Jonas S. Lissau
- SDU NanoSYD, Mads Clausen InstituteUniversity of Southern Denmark, Alsion 2 6400 Sønderborg Denmark
| | - Luigi Nucci
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
- Dipartimento di Chimica e Chimica IndustrialeUniversitá di Pisa Via Moruzzi 3 Pisa Italy
| | - Tõnu Pullerits
- Division of Chemical PhysicsLund Universitet Naturvetarvägen 16 22362 Lund Sweden
| | - Kurt V. Mikkelsen
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
| | - Mogens Brøndsted Nielsen
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
| | - Theis I. Sølling
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
- King Fahd University of Petroleum and Minerals Bldg. 15, Rm. 6124 Dhahran 31261 Kingdom of Saudi Arabia
| | - Thorsten Hansen
- Department of ChemistryUniversity of Copenhagen Universitetsparken 5 DK-2100 Copenhagen Ø Denmark
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17
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An R, Zhang F, Zou X, Tang Y, Liang M, Oshchapovskyy I, Liu Y, Honarfar A, Zhong Y, Li C, Geng H, Chen J, Canton SE, Pullerits T, Zheng K. Photostability and Photodegradation Processes in Colloidal CsPbI 3 Perovskite Quantum Dots. ACS Appl Mater Interfaces 2018; 10:39222-39227. [PMID: 30350934 DOI: 10.1021/acsami.8b14480] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
All-inorganic CsPbI3 perovskite quantum dots (QDs) have attracted intense attention for their successful application in photovoltaics (PVs) and optoelectronics that are enabled by their superior absorption capability and great photoluminescence (PL) properties. However, their photostability remains a practical bottleneck and further optimization is highly desirable. Here, we studied the photostability of as-obtained colloidal CsPbI3 QDs suspended in hexane. We found that light illumination does induce photodegradation of CsPbI3 QDs. Steady-state spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and transient absorption spectroscopy verified that light illumination leads to detachment of the capping agent, collapse of the CsPbI3 QD surface, and finally aggregation of surface Pb0. Both dangling bonds containing surface and Pb0 serve as trap states causing PL quenching with a dramatic decrease of PL quantum yield. Our work provides a detailed insight about the correlation between the structural and photophysical consequences of the photodegradation process in CsPbI3 QDs and may lead to the optimization of such QDs toward device applications.
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Affiliation(s)
- Rui An
- Department of Chemistry "G. Ciamician" , University of Bologna , Via F. Selmi 2 , 40126 Bologna , Italy
| | - Fengying Zhang
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering , Southwest University , Chongqing 400715 , People's Republic of China
| | | | - Yingying Tang
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
| | - Mingli Liang
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
| | - Ihor Oshchapovskyy
- Department of Inorganic Chemistry , Ivan Franko National University of Lviv , Kyryla i Mefodiya Str. 6 , 79005 Lviv , Ukraine
| | | | | | | | | | - Huifang Geng
- ELI-ALPS, ELI-HU Non-Profit Ltd. , Dugonicster 13 , Szeged 6720 , Hungary
| | | | - Sophie E Canton
- ELI-ALPS, ELI-HU Non-Profit Ltd. , Dugonicster 13 , Szeged 6720 , Hungary
- Attoscience Group , Deutsche Elektronen Synchrotron (DESY) , Notkestrasse 85 , D-22607 Hamburg , Germany
| | | | - Kaibo Zheng
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
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18
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Schröter M, Pullerits T, Kühn O. Using fluorescence detected two-dimensional spectroscopy to investigate initial exciton delocalization between coupled chromophores. J Chem Phys 2018; 149:114107. [DOI: 10.1063/1.5046645] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Marco Schröter
- Institute of Physics, University of Rostock, Albert Einstein Straße 23-24, 18059 Rostock, Germany
| | - Tõnu Pullerits
- Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Oliver Kühn
- Institute of Physics, University of Rostock, Albert Einstein Straße 23-24, 18059 Rostock, Germany
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19
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Yang B, Chen J, Shi Q, Wang Z, Gerhard M, Dobrovolsky A, Scheblykin IG, Karki KJ, Han K, Pullerits T. High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector. J Phys Chem Lett 2018; 9:5017-5022. [PMID: 30124049 DOI: 10.1021/acs.jpclett.8b02250] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We fabricate photodetectors based on solution-processed single CH3NH3PbBr3 microcrystals (MCs) and map the two-photon absorption (TPA) excited photocurrent (PC) with spatial resolution of 1 μm. We find that the charge carrier transport length in the MCs depends on the applied electric field, and increases from 5.7 μm for 0.02 V bias (dominated by carrier diffusion) to 23.2 μm for 2 V bias (dominated by carrier drift). Furthermore, PC shows strong spatial variations. Combining the PC mapping results with time-resolved photoluminescence microscopy, we demonstrate that the spatial distribution of PC mainly originates from the inhomogeneous distribution of trap-states across perovskite MCs. This suggests that there is still large margin for improvement of perovskite single crystal devices by better controlling of the traps.
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Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP) , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian , Liaoning 116023 , China
- University of the Chinese Academy of Sciences , Beijing 100039 , P. R. China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP) , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian , Liaoning 116023 , China
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
| | - Qi Shi
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
| | - Zhengjun Wang
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
| | - Marina Gerhard
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
| | - Alexander Dobrovolsky
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
| | - Ivan G Scheblykin
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
| | - Khadga Jung Karki
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP) , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian , Liaoning 116023 , China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center , Lund University , P.O. Box 124, 22100 Lund , Sweden
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20
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Tang Y, Cao X, Honarfar A, Abdellah M, Chen C, Avila J, Asensio MC, Hammarström L, Sa J, Canton SE, Zheng K, Pullerits T, Chi Q. Inorganic Ions Assisted the Anisotropic Growth of CsPbCl 3 Nanowires with Surface Passivation Effect. ACS Appl Mater Interfaces 2018; 10:29574-29582. [PMID: 30088920 DOI: 10.1021/acsami.8b09113] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
All-inorganic halide perovskite nanowires (NWs) exhibit improved thermal and hydrolysis stability and could thus play a vital role in nanoscale optoelectronics. Among them, blue-light-based devices are extremely limited because of the lack of a facile method to obtain high-purity CsPbCl3 NWs. Herein, we report a direct and facile method for the synthesis of CsPbCl3 NWs assisted by inorganic ions that served both as a morphology controlling agent for the anisotropic growth of nanomaterials and a surface passivation species modulating the surface of nanomaterials. This new approach allows us to obtain high-purity and size-uniform NWs as long as 500 nm in length and 20 nm in diameter with high reproducibility. X-ray photoelectron spectroscopy and ultrafast spectroscopic measurements confirmed that a reduced band gap caused by the surface species of NWs relative to nanocubes (NCs) was achieved at the photon energy of 160 eV because of the hybrid surface passivation contributed by adsorbed inorganic ions. The resulting NWs demonstrate significantly enhanced photoelectrochemical performances, 3.5-fold increase in the photocurrent generation, and notably improved stability compared to their NC counterparts. Our results suggest that the newly designed NWs could be a promising material for the development of nanoscale optoelectronic devices.
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Affiliation(s)
- Yingying Tang
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
| | - Xianyi Cao
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
| | - Alireza Honarfar
- Department of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Mohamed Abdellah
- Ångstrom Laboratory, Department of Chemistry , Uppsala University , Box 523, 75120 Uppsala , Sweden
- Department of Chemistry, Qena Faculty of Science , South Valley University , 83523 Qena , Egypt
| | - Chaoyu Chen
- Synchrotron SOLEIL , L'Orme des Mérisiers , Saint Aubin-BP 48, 91192 Gif sur Yvette Cedex , France
| | - José Avila
- Synchrotron SOLEIL , L'Orme des Mérisiers , Saint Aubin-BP 48, 91192 Gif sur Yvette Cedex , France
| | - Maria-Carmen Asensio
- Synchrotron SOLEIL , L'Orme des Mérisiers , Saint Aubin-BP 48, 91192 Gif sur Yvette Cedex , France
| | - Leif Hammarström
- Ångstrom Laboratory, Department of Chemistry , Uppsala University , Box 523, 75120 Uppsala , Sweden
| | - Jacinto Sa
- Ångstrom Laboratory, Department of Chemistry , Uppsala University , Box 523, 75120 Uppsala , Sweden
| | - Sophie E Canton
- ELI-ALPS, ELI-HU Non-Profit Ltd. , Dugonicster 13 , Szeged 6720 , Hungary
- Attoscience Group, Deutsche Elektronen Synchrotron (DESY) , Notkestrasse 85 , D-22607 Hamburg , Germany
| | - Kaibo Zheng
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
- Department of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Qijin Chi
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
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21
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Ghosh S, Shi Q, Pradhan B, Kumar P, Wang Z, Acharya S, Pal SK, Pullerits T, Karki KJ. Phonon Coupling with Excitons and Free Carriers in Formamidinium Lead Bromide Perovskite Nanocrystals. J Phys Chem Lett 2018; 9:4245-4250. [PMID: 29996055 DOI: 10.1021/acs.jpclett.8b01729] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Organometal halide perovskites in the form of nanocrystals (NCs) have attracted enormous attention due to their unique optoelectronic and photoluminescence (PL) properties. Here, we examine the phase composition and the temperature dependence of emission line width broadening in formamidinium lead bromide (FAPbBr3) perovskite nanocrystals (NCs) for light-emitting applications and identify different charge-carrier scattering mechanisms. Our results show most of the emission is from the orthorhombic phase. The PL line width broadening at high temperature is dominated by the Fröhlich interaction between the free charge carriers and the optical phonons. At low temperatures, the peak of the PL spectrum exhibits a continuous red shift indicating an increase of excitons contribution at lower temperatures, and concurrently the line width also narrows down due to the inhibition of the optical phonons. From the temperature-dependent measurements, the coupling strength of both the charge phonon interaction and the exciton phonon interaction have been determined. The obtained results indicate that the charge phonon coupling strengths are higher compared to the exciton phonon coupling.
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Affiliation(s)
- Supriya Ghosh
- School of Basic Sciences and Advanced Material Research Center , Indian Institute of Technology Mandi , Kamand , 175005 Himachal Pradesh , India
| | - Qi Shi
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Bapi Pradhan
- Centre for Advanced Materials , Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032 , India
| | - Pushpendra Kumar
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Zhengjun Wang
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Somobrata Acharya
- Centre for Advanced Materials , Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032 , India
| | - Suman Kalyan Pal
- School of Basic Sciences and Advanced Material Research Center , Indian Institute of Technology Mandi , Kamand , 175005 Himachal Pradesh , India
| | - Tõnu Pullerits
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Khadga J Karki
- The Division of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
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22
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Abstract
Fano interferences in nanostructures are influenced by dissipation effects as well as many-body interactions. Two-dimensional coherent spectroscopies have just begun to be applied to these systems where the spectroscopic signatures of a discrete-continuum structure are not known. In this article, we calculate the excited-state absorption contribution for different models of higher lying excited states. We find that the characteristic asymmetry of one-dimensional spectroscopies is recovered from the many-body contributions and that the higher lying excited manifolds have distorted lineshapes that are not anticipated from discrete-level Hamiltonians. We show that the Stimulated Emission cannot have contributions from a flat continuum of states. This work completes the Ground-State Bleach and Stimulated Emission signals that were calculated previously [D. Finkelstein-Shapiro et al., Phys. Rev. B 94, 205137 (2016)]. The model reproduces the observations reported for molecules on surfaces probed by 2DIR.
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Affiliation(s)
| | - Tõnu Pullerits
- Division of Chemical Physics, Lund University, P.O. Box 124, 221 00 Lund, Sweden
| | - Thorsten Hansen
- Department of Chemistry, University of Copenhagen, DK 2100 Copenhagen, Denmark
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23
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Yang B, Chen J, Yang S, Hong F, Sun L, Han P, Pullerits T, Deng W, Han K. Lead-Free Silver-Bismuth Halide Double Perovskite Nanocrystals. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800660] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences; Beijing 100039 P. R. China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- Department of Chemical Physics and NanoLund, Chemical Center; Lund University; P.O. Box 124 22100 Lund Sweden
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Feng Hong
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences; Beijing 100039 P. R. China
| | - Lei Sun
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Peigeng Han
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences; Beijing 100039 P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center; Lund University; P.O. Box 124 22100 Lund Sweden
| | - Weiqiao Deng
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- Institute of Molecular Sciences and Engineering; Shandong University; Qingdao P. R. China
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- Institute of Molecular Sciences and Engineering; Shandong University; Qingdao P. R. China
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24
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Yang B, Chen J, Yang S, Hong F, Sun L, Han P, Pullerits T, Deng W, Han K. Lead-Free Silver-Bismuth Halide Double Perovskite Nanocrystals. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/anie.201800660] [Citation(s) in RCA: 208] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences; Beijing 100039 P. R. China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- Department of Chemical Physics and NanoLund, Chemical Center; Lund University; P.O. Box 124 22100 Lund Sweden
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Feng Hong
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences; Beijing 100039 P. R. China
| | - Lei Sun
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Peigeng Han
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences; Beijing 100039 P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center; Lund University; P.O. Box 124 22100 Lund Sweden
| | - Weiqiao Deng
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- Institute of Molecular Sciences and Engineering; Shandong University; Qingdao P. R. China
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
- Institute of Molecular Sciences and Engineering; Shandong University; Qingdao P. R. China
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25
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Chen J, Chábera P, Pascher T, Messing ME, Schaller R, Canton S, Zheng K, Pullerits T. Enhanced Size Selection in Two-Photon Excitation for CsPbBr 3 Perovskite Nanocrystals. J Phys Chem Lett 2017; 8:5119-5124. [PMID: 28975796 DOI: 10.1021/acs.jpclett.7b02178] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs), with large two-photon absorption (TPA) cross-section and bright photoluminescence (PL), have been demonstrated as stable two-photon-pumped lasing medium. With two-photon excitation, red-shifted PL spectrum and increased PL lifetime is observed compared with one-photon excitation. We have investigated the origin of such difference using time-resolved laser spectroscopies. We ascribe the difference to the enhanced size selection of NCs by two-photon excitation. Because of inherent nonlinearity, the size dependence of absorption cross-section under TPA is stronger. Consequently, larger size NCs are preferably excited, leading to longer excited-state lifetime and red-shifted PL emission. In a broad view, the enhanced size selection in two-photon excitation of CsPbBr3 NCs is likely a general feature of the perovskite NCs and can be tuned via NC size distribution to influence their performance within NC-based nonlinear optical materials and devices.
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Affiliation(s)
- Junsheng Chen
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China
| | - Pavel Chábera
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
| | - Torbjörn Pascher
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
| | - Maria E Messing
- Solid State Physics and NanoLund, Lund University , Box 118, 22100 Lund, Sweden
| | - Richard Schaller
- Center for Nanoscale Materials, Argonne National Laboratory , 9700 Cass Avenue, Argonne, Illinois 60439, United States
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Sophie Canton
- ELI-ALPS, ELI-HU Non-Profit, Ltd. , Dugonics ter 13, Szeged 6720, Hungary
- Attoscience Group, Deutsche Elektronen Synchrotron (DESY) , Notkestrasse 85, D-22607 Hamburg, Germany
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- Gas Processing Center, College of Engineering, Qatar University , P.O. Box 2713, Doha, Qatar
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
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26
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Yang B, Zhang F, Chen J, Yang S, Xia X, Pullerits T, Deng W, Han K. Ultrasensitive and Fast All-Inorganic Perovskite-Based Photodetector via Fast Carrier Diffusion. Adv Mater 2017; 29. [PMID: 28863245 DOI: 10.1002/adma.201703758] [Citation(s) in RCA: 122] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 08/02/2017] [Indexed: 05/07/2023]
Abstract
Low trap-state density, high carrier mobility, and efficient charge carrier collection are key parameters for photodetectors with high sensitivity and fast response time. This study demonstrates a simple solution growth method to prepare CsPbBr3 microcrystals (MCs) with low trap-state density. Time-dependent photoluminescence study with one-photon excitation (OPE) and two-photon excitation (TPE) indicates that CsPbBr3 MCs exhibit fast carrier diffusion with carrier mobility over 100 cm2 V-1 S-1 . Furthermore, CsPbBr3 MC-based photodetectors with high charge carriers' collection efficiency are fabricated. Such photodetectors show ultrahigh responsivity (R) up to 6 × 104 A W-1 with OPE and high R up to 6 A W-1 with TPE. The R for OPE is over one order of magnitude higher (the R for TPE is three orders of magnitude higher) than that of previously reported all-inorganic perovskite-based photodetectors. Moreover, the photodetectors exhibit fast response time of ≈1 ms, which corresponds to a gain ≈105 and a gain- bandwidth product of 108 Hz for OPE (a gain ≈103 and a gain-bandwidth product of 106 Hz for TPE).
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Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
- University of the Chinese Academy of Sciences, Beijing, 10049, China
| | - Fengying Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
- Department of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, Lund, 22100, Sweden
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
| | - Xusheng Xia
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
- University of the Chinese Academy of Sciences, Beijing, 10049, China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, Lund, 22100, Sweden
| | - Weiqiao Deng
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023, China
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27
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Abdellah M, Poulsen F, Zhu Q, Zhu N, Žídek K, Chábera P, Corti A, Hansen T, Chi Q, Canton SE, Zheng K, Pullerits T. Drastic difference between hole and electron injection through the gradient shell of Cd xSe yZn 1-xS 1-y quantum dots. Nanoscale 2017; 9:12503-12508. [PMID: 28819669 DOI: 10.1039/c7nr04495j] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ultrafast fluorescence spectroscopy was used to investigate the hole injection in CdxSeyZn1-xS1-y gradient core-shell quantum dot (CSQD) sensitized p-type NiO photocathodes. A series of CSQDs with a wide range of shell thicknesses was studied. Complementary photoelectrochemical cell measurements were carried out to confirm that the hole injection from the active core through the gradient shell to NiO takes place. The hole injection from the valence band of the QDs to NiO depends much less on the shell thickness when compared to the corresponding electron injection to n-type semiconductor (ZnO). We simulate the charge carrier tunneling through the potential barrier due to the gradient shell by numerically solving the Schrödinger equation. The details of the band alignment determining the potential barrier are obtained from X-ray spectroscopy measurements. The observed drastic differences between the hole and electron injection are consistent with a model where the hole effective mass decreases, while the gradient shell thickness increases.
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Affiliation(s)
- Mohamed Abdellah
- Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100, Lund, Sweden.
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28
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Yang B, Chen J, Hong F, Mao X, Zheng K, Yang S, Li Y, Pullerits T, Deng W, Han K. Lead‐Free, Air‐Stable All‐Inorganic Cesium Bismuth Halide Perovskite Nanocrystals. Angew Chem Int Ed Engl 2017; 56:12471-12475. [DOI: 10.1002/anie.201704739] [Citation(s) in RCA: 384] [Impact Index Per Article: 54.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 06/30/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Feng Hong
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Xin Mao
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Yajuan Li
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Weiqiao Deng
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
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29
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Yang B, Chen J, Hong F, Mao X, Zheng K, Yang S, Li Y, Pullerits T, Deng W, Han K. Lead‐Free, Air‐Stable All‐Inorganic Cesium Bismuth Halide Perovskite Nanocrystals. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704739] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Feng Hong
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Xin Mao
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Yajuan Li
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Weiqiao Deng
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
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30
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Chen J, Yang B, Li C, Zheng K, Žídek K, Pullerits T. Photostability of the Oleic Acid-Encapsulated Water-Soluble Cd x Se y Zn 1-x S 1-y Gradient Core-Shell Quantum Dots. ACS Omega 2017; 2:1922-1929. [PMID: 31457551 PMCID: PMC6640918 DOI: 10.1021/acsomega.7b00316] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 04/27/2017] [Indexed: 05/02/2023]
Abstract
Composite systems where quantum dots (QDs) are combined with other nanomaterials (e.g., gold nanorods) in aqueous solutions have attracted broad attention-both for their potential in applications and for studies of fundamental processes. However, high-quality QDs are typically prepared in organic solvents, and the transfer of QDs to an aqueous phase is needed to create the desired QD composites. Photostability of the transferred QDs-both the steady-state and photo-induced dynamic properties-is essential for studying the processes in the composites and for their applications. We present a detailed study of the photostability of aqueous Cd x Se y Zn1-x S1-y gradient core-shell QDs obtained by various approaches using linker exchange and surfactant encapsulation. Beside the steady-state photoluminescence (PL) emission stability, we also study changes in the PL decay. From the variety of the studied samples, the water-soluble QDs encapsulated by a double layer of oleic acid show superior properties, that is, stable PL emission and PL decay under continuous light or pulsed-laser light irradiation. We demonstrate that the double-layer encapsulation of QDs can be used to create QDs-metal nanoparticle composites.
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Affiliation(s)
- Junsheng Chen
- Department
of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China
| | - Bin Yang
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China
| | - Chuanshuai Li
- Department
of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Kaibo Zheng
- Department
of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
- Gas
Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Karel Žídek
- Department
of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
- Regional
Centre for Special Optics and Optoelectronic Systems (TOPTEC), Institute
of Plasma Physics, Academy of Sciences of
the Czech Republic, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic
- E-mail: (K.Ž.)
| | - Tõnu Pullerits
- Department
of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden
- E-mail: (T.P.)
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31
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Chen J, Žídek K, Chábera P, Liu D, Cheng P, Nuuttila L, Al-Marri MJ, Lehtivuori H, Messing ME, Han K, Zheng K, Pullerits T. Size- and Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr 3 Perovskite Quantum Dots. J Phys Chem Lett 2017; 8:2316-2321. [PMID: 28480702 DOI: 10.1021/acs.jpclett.7b00613] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [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
All-inorganic colloidal perovskite quantum dots (QDs) based on cesium, lead, and halide have recently emerged as promising light emitting materials. CsPbBr3 QDs have also been demonstrated as stable two-photon-pumped lasing medium. However, the reported two photon absorption (TPA) cross sections for these QDs differ by an order of magnitude. Here we present an in-depth study of the TPA properties of CsPbBr3 QDs with mean size ranging from 4.6 to 11.4 nm. By using femtosecond transient absorption (TA) spectroscopy we found that TPA cross section is proportional to the linear one photon absorption. The TPA cross section follows a power law dependence on QDs size with exponent 3.3 ± 0.2. The empirically obtained power-law dependence suggests that the TPA process through a virtual state populates exciton band states. The revealed power-law dependence and the understanding of TPA process are important for developing high performance nonlinear optical devices based on CsPbBr3 nanocrystals.
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Affiliation(s)
- Junsheng Chen
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, China
| | - Karel Žídek
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- Regional Centre for Special Optics and Optoelectronic Systems (TOPTEC), Institute of Plasma Physics, Academy of Sciences of the Czech Republic , Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic
| | - Pavel Chábera
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
| | - Dongzhou Liu
- College of Science, Agricultural University of Hebei , Lingyusi 289, 071001, Baoding, Hebei China
- College of Physics Science & Technology, Hebei University , East of Wusi 180, 071002, Baoding, Hebei China
| | - Pengfei Cheng
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, China
| | - Lauri Nuuttila
- University of Jyväskylä , Department of Physics, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Mohammed J Al-Marri
- Gas Processing Center, College of Engineering, Qatar University , P.O. Box 2713, Doha, Qatar
| | - Heli Lehtivuori
- University of Jyväskylä , Department of Physics, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Maria E Messing
- Solid State Physics and NanoLund, Lund University , Box 118, 22100 Lund, Sweden
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, China
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- Gas Processing Center, College of Engineering, Qatar University , P.O. Box 2713, Doha, Qatar
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
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32
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Peng J, Chen Y, Zheng K, Pullerits T, Liang Z. Insights into charge carrier dynamics in organo-metal halide perovskites: from neat films to solar cells. Chem Soc Rev 2017; 46:5714-5729. [DOI: 10.1039/c6cs00942e] [Citation(s) in RCA: 157] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Various transport measurements for perovskites are reviewed with profound insights into charge dynamics from neat films to solar cells.
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Affiliation(s)
- Jiajun Peng
- Department of Materials Science
- Fudan University
- Shanghai 200433
- China
| | - Yani Chen
- Department of Materials Science
- Fudan University
- Shanghai 200433
- China
| | - Kaibo Zheng
- Division of Chemical Physics and NanoLund
- Lund University
- 22100 Lund
- Sweden
- Gas Processing Center
| | - Tõnu Pullerits
- Division of Chemical Physics and NanoLund
- Lund University
- 22100 Lund
- Sweden
| | - Ziqi Liang
- Department of Materials Science
- Fudan University
- Shanghai 200433
- China
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33
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Bokareva OS, Shibl MF, Al-Marri MJ, Pullerits T, Kühn O. Optimized Long-Range Corrected Density Functionals for Electronic and Optical Properties of Bare and Ligated CdSe Quantum Dots. J Chem Theory Comput 2016; 13:110-116. [DOI: 10.1021/acs.jctc.6b01039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- O. S. Bokareva
- Institut
für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, 18059 Rostock, Germany
| | - M. F. Shibl
- Gas
Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - M. J. Al-Marri
- Gas
Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - T. Pullerits
- Chemical
Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - O. Kühn
- Institut
für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, 18059 Rostock, Germany
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34
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Damtie FA, Karki KJ, Pullerits T, Wacker A. Optimization schemes for efficient multiple exciton generation and extraction in colloidal quantum dots. J Chem Phys 2016. [DOI: 10.1063/1.4960507] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Affiliation(s)
| | - Khadga J. Karki
- Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
| | - Tõnu Pullerits
- Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
| | - Andreas Wacker
- Mathematical Physics and NanoLund, Lund University, Box 118, 22100 Lund, Sweden
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35
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Chen J, Žídek K, Abdellah M, Al-Marri MJ, Zheng K, Pullerits T. Surface plasmon inhibited photo-luminescence activation in CdSe/ZnS core-shell quantum dots. J Phys Condens Matter 2016; 28:254001. [PMID: 27167726 DOI: 10.1088/0953-8984/28/25/254001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In a composite film of Cd x Se y Zn1-x S1-y gradient core-shell quantum dots (QDs) and gold nanorods (NRs), the optical properties of the QDs are drastically affected by the plasmonic nanoparticles. We provide a careful study of the two-step formation of the film and its morphology. Subsequently we focus on QD luminescence photoactivation-a process induced by photochemical changes on the QD surface. We observe that even a sparse coverage of AuNRs can completely inhibit the photoactivation of the QDs' emission in the film. We demonstrate that the inhibition can be accounted for by a rapid energy transfer between QDs and AuNRs. Finally, we propose that the behavior of emission photoactivation can be used as a signature to distinguish between energy and electron transfer in the QD-based materials.
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Affiliation(s)
- Junsheng Chen
- Department of Chemical Physics, Chemical Center, Lund University, PO Box 124, 22100 Lund, Sweden. State Key Laboratory of Molecular Reaction Dynamics, Dalian, Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, Dalian People's Republic of China
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36
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Abstract
Electron transfer (ET) is the key process in light-driven charge separation reactions in organic solar cells. The current review summarizes the progress in theoretical modelling of ET in these materials. First we give an account of ET, with a description originating from Marcus theory. We systematically go through all the relevant parameters and show how they depend on different material properties, and discuss the consequences such dependencies have for the performance of the devices. Finally, we present a set of visualization methods which have proven to be very useful in analyzing the elementary processes in absorption and charge separation events. Such visualization tools help us to understand the properties of the photochemical and photobiological systems in solar cells.
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Affiliation(s)
- Peng Song
- Department of Physics, Liaoning University, Shenyang, 110036, P. R. China.,Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Science, Beijing, 100190, P. R. China.,State Key laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics Chinese Academy of Science, Dalian, 116023, P. R. China
| | - Yuanzuo Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Science, Beijing, 100190, P. R. China.,College of Science, Northeast Forestry University, Harbin, 150040, P. R. China
| | - Fengcai Ma
- Department of Physics, Liaoning University, Shenyang, 110036, P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics, Lund University, Box 124, Lund, 22100, Sweden.,State Key laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics Chinese Academy of Science, Dalian, 116023, P. R. China
| | - Mengtao Sun
- Department of Physics, Liaoning University, Shenyang, 110036, P. R. China.,Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Science, Beijing, 100190, P. R. China
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37
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Tubasum S, Torbjörnsson M, Yadav D, Camacho R, Söderlind G, Scheblykin IG, Pullerits T. Protein Configuration Landscape Fluctuations Revealed by Exciton Transition Polarizations in Single Light Harvesting Complexes. J Phys Chem B 2016; 120:724-32. [PMID: 26741912 DOI: 10.1021/acs.jpcb.5b12466] [Citation(s) in RCA: 4] [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] [Indexed: 01/09/2023]
Abstract
Protein is a flexible material with broad distribution of conformations forming an energy landscape of quasi-stationary states. Disentangling the system dynamics along this landscape is the key for understanding the functioning of the protein. Here we studied a photosynthetic antenna pigment-protein complex LH2 with single molecule two-dimensional polarization imaging. Modeling based on the Redfield relaxation theory well describes the observed polarization properties of LH2 fluorescence and fluorescence excitation, strongly suggesting that at 77 K the conformational subspace of the LH2 is limited to about three configurations with relatively frequent switching among each other. At room temperature the next level of fluctuations determines the conformational dynamics. The results support the multitier model of the energy landscape of proteins and demonstrate the potential of the method for the studies of structural dynamics in proteins.
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Affiliation(s)
- Sumera Tubasum
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Magne Torbjörnsson
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Dheerendra Yadav
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Rafael Camacho
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Gustaf Söderlind
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Ivan G Scheblykin
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Tõnu Pullerits
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
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38
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Lenngren N, Abdellah MA, Zheng K, Al-Marri MJ, Zigmantas D, Žídek K, Pullerits T. Hot electron and hole dynamics in thiol-capped CdSe quantum dots revealed by 2D electronic spectroscopy. Phys Chem Chem Phys 2016; 18:26199-26204. [DOI: 10.1039/c6cp04190f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
State-specific relaxation and trapping of excitations in thiol-capped CdSe QDs is followed by 2D electronic spectroscopy.
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Affiliation(s)
- Nils Lenngren
- Department of Chemical Physics
- Lund University
- 221 00 Lund
- Sweden
| | - Mohamed A. Abdellah
- Department of Chemical Physics
- Lund University
- 221 00 Lund
- Sweden
- Department of Chemistry
| | - Kaibo Zheng
- Department of Chemical Physics
- Lund University
- 221 00 Lund
- Sweden
- Gas Processing Center
| | | | | | - Karel Žídek
- Department of Chemical Physics
- Lund University
- 221 00 Lund
- Sweden
- Regional Centre for Special Optics and Optoelectronic Systems (TOPTEC)
| | - Tõnu Pullerits
- Department of Chemical Physics
- Lund University
- 221 00 Lund
- Sweden
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39
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Camacho R, Tubasum S, Southall J, Cogdell RJ, Sforazzini G, Anderson HL, Pullerits T, Scheblykin IG. Fluorescence polarization measures energy funneling in single light-harvesting antennas--LH2 vs conjugated polymers. Sci Rep 2015; 5:15080. [PMID: 26478272 PMCID: PMC4609963 DOI: 10.1038/srep15080] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [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: 05/15/2015] [Accepted: 09/09/2015] [Indexed: 01/15/2023] Open
Abstract
Numerous approaches have been proposed to mimic natural photosynthesis using artificial antenna systems, such as conjugated polymers (CPs), dendrimers, and J-aggregates. As a result, there is a need to characterize and compare the excitation energy transfer (EET) properties of various natural and artificial antennas. Here we experimentally show that EET in single antennas can be characterized by 2D polarization imaging using the single funnel approximation. This methodology addresses the ability of an individual antenna to transfer its absorbed energy towards a single pool of emissive states, using a single parameter called energy funneling efficiency (ε). We studied individual peripheral antennas of purple bacteria (LH2) and single CP chains of 20 nm length. As expected from a perfect antenna, LH2s showed funneling efficiencies close to unity. In contrast, CPs showed lower average funneling efficiencies, greatly varying from molecule to molecule. Cyclodextrin insulation of the conjugated backbone improves EET, increasing the fraction of CPs possessing ε = 1. Comparison between LH2s and CPs shows the importance of the protection systems and the protein scaffold of LH2, which keep the chromophores in functional form and at such geometrical arrangement that ensures excellent EET.
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Affiliation(s)
- Rafael Camacho
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
| | - Sumera Tubasum
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
| | - June Southall
- Glasgow Biomedical Research Centre, University of Glasgow, G12 8QQ, United Kingdom
| | - Richard J Cogdell
- Glasgow Biomedical Research Centre, University of Glasgow, G12 8QQ, United Kingdom
| | - Giuseppe Sforazzini
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Harry L Anderson
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Tõnu Pullerits
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
| | - Ivan G Scheblykin
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
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40
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Tian Y, Merdasa A, Unger E, Abdellah M, Zheng K, McKibbin S, Mikkelsen A, Pullerits T, Yartsev A, Sundström V, Scheblykin IG. Enhanced Organo-Metal Halide Perovskite Photoluminescence from Nanosized Defect-Free Crystallites and Emitting Sites. J Phys Chem Lett 2015; 6:4171-7. [PMID: 26722793 DOI: 10.1021/acs.jpclett.5b02033] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Photoluminescence (PL) of organo-metal halide perovskite semiconductors can be enhanced by several orders of magnitude by exposure to visible light. We applied PL microscopy and super-resolution optical imaging to investigate this phenomenon with spatial resolution better than 10 nm using films of CH3NH3PbI3 prepared by the equimolar solution-deposition method, resulting in crystals of different sizes. We found that PL of ∼100 nm crystals enhances much faster than that of larger, micrometer-sized ones. This crystal-size dependence of the photochemical light passivation of charge traps responsible for PL quenching allowed us to conclude that traps are present in the entire crystal volume rather than at the surface only. Because of this effect, "dark" micrometer-sized perovskite crystals can be converted into highly luminescent smaller ones just by mechanical grinding. Super-resolution optical imaging shows spatial inhomogeneity of the PL intensity within perovskite crystals and the existence of <100 nm-sized localized emitting sites. The possible origin of these sites is discussed.
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Affiliation(s)
- Yuxi Tian
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
| | - Aboma Merdasa
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
| | - Eva Unger
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
| | - Mohamed Abdellah
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
| | - Kaibo Zheng
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
| | - Sarah McKibbin
- Division of Synchrotron Radiation Research, Lund University , Box 118, 221 00 Lund, Sweden
| | - Anders Mikkelsen
- Division of Synchrotron Radiation Research, Lund University , Box 118, 221 00 Lund, Sweden
| | - Tõnu Pullerits
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
| | - Arkady Yartsev
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
| | - Villy Sundström
- Chemical Physics, Lund University , Box 124, SE-22100 Lund, Sweden
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41
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Zheng K, Zhu Q, Abdellah M, Messing ME, Zhang W, Generalov A, Niu Y, Ribaud L, Canton SE, Pullerits T. Exciton Binding Energy and the Nature of Emissive States in Organometal Halide Perovskites. J Phys Chem Lett 2015; 6:2969-75. [PMID: 26267190 DOI: 10.1021/acs.jpclett.5b01252] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Characteristics of nanoscale materials are often different from the corresponding bulk properties providing new, sometimes unexpected, opportunities for applications. Here we investigate the properties of 8 nm colloidal nanoparticles of MAPbBr3 perovskites and contrast them to the ones of large microcrystallites representing a bulk. X-ray spectroscopies provide an exciton binding energy of 0.32 ± 0.10 eV in the nanoparticles. This is 5 times higher than the value of bulk crystals (0.084 ± 0.010 eV), and readily explains the high fluorescence quantum yield in nanoparticles. In the bulk, at high excitation concentrations, the fluorescence intensity has quadratic behavior following the Saha-Langmuir model due to the nongeminate recombination of charges forming the emissive exciton states. In the nanoparticles, a linear dependence is observed since the excitation concentration per particle is significantly less than one. Even the bulk shows linear emission intensity dependence at lower excitation concentrations. In this case, the average excitation spacing becomes larger than the carrier diffusion length suppressing the nongeminate recombination. From these considerations we obtain the charge carrier diffusion length in MAPbBr3 of 100 nm.
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Affiliation(s)
- Kaibo Zheng
- †Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Qiushi Zhu
- §Department of Synchrotron Radiation Instrumentation, Lund University, Box 118, 22100, Lund, Sweden
| | - Mohamed Abdellah
- †Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
- ‡Department of Chemistry, Qena Faculty of Science, South Valley University, Qena 83523, Egypt
| | - Maria E Messing
- ∥Deptartment of Solid State Physics, Lund University, Box 118, 22100, Lund, Sweden
| | - Wei Zhang
- †Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | | | - Yuran Niu
- ⊥MAX IV Laboratory, Lund University, Box 118, 22100, Lund, Sweden
| | - Lynn Ribaud
- #X-ray Science Division, Advanced Photon Source and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Sophie E Canton
- ∇IFG Structural Dynamics of (Bio)chemical Systems, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, D-37077 Goettingen, Germany
- ○FS-SCS, Structural Dynamics with Ultra-short Pulsed X-rays, Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, D-22607 Hamburg, Germany
| | - Tõnu Pullerits
- †Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
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42
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Zhu N, Zheng K, Karki KJ, Abdellah M, Zhu Q, Carlson S, Haase D, Žídek K, Ulstrup J, Canton SE, Pullerits T, Chi Q. Sandwiched confinement of quantum dots in graphene matrix for efficient electron transfer and photocurrent production. Sci Rep 2015; 5:9860. [PMID: 25996307 PMCID: PMC4649995 DOI: 10.1038/srep09860] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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: 11/03/2014] [Accepted: 03/24/2015] [Indexed: 12/21/2022] Open
Abstract
Quantum dots (QDs) and graphene are both promising materials for the development of new-generation optoelectronic devices. Towards this end, synergic assembly of these two building blocks is a key step but remains a challenge. Here, we show a one-step strategy for organizing QDs in a graphene matrix via interfacial self-assembly, leading to the formation of sandwiched hybrid QD-graphene nanofilms. We have explored structural features, electron transfer kinetics and photocurrent generation capacity of such hybrid nanofilms using a wide variety of advanced techniques. Graphene nanosheets interlink QDs and significantly improve electronic coupling, resulting in fast electron transfer from photoexcited QDs to graphene with a rate constant of 1.3 × 10(9) s(-1). Efficient electron transfer dramatically enhances photocurrent generation in a liquid-junction QD-sensitized solar cell where the hybrid nanofilm acts as a photoanode. We thereby demonstrate a cost-effective method to construct large-area QD-graphene hybrid nanofilms with straightforward scale-up potential for optoelectronic applications.
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Affiliation(s)
- Nan Zhu
- Department of Chemistry, Technical University of Denmark, Kemitorvet Building 207, DK-2800 Kongens Lyngby, Denmark
| | - Kaibo Zheng
- Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Khadga J. Karki
- Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Mohamed Abdellah
- Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
- Department of Chemistry, Faculty of Science, South valley University, Qena 83523, Egypt
| | - Qiushi Zhu
- The MAX IV Laboratory, Lund University, Box 124, 22100, Lund, Sweden
| | - Stefan Carlson
- The MAX IV Laboratory, Lund University, Box 124, 22100, Lund, Sweden
| | - Dörthe Haase
- The MAX IV Laboratory, Lund University, Box 124, 22100, Lund, Sweden
| | - Karel Žídek
- Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Jens Ulstrup
- Department of Chemistry, Technical University of Denmark, Kemitorvet Building 207, DK-2800 Kongens Lyngby, Denmark
| | - Sophie E. Canton
- The MAX IV Laboratory, Lund University, Box 124, 22100, Lund, Sweden
| | - Tõnu Pullerits
- Department of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Qijin Chi
- Department of Chemistry, Technical University of Denmark, Kemitorvet Building 207, DK-2800 Kongens Lyngby, Denmark
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43
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Tian Y, Merdasa A, Peter M, Abdellah M, Zheng K, Ponseca CS, Pullerits T, Yartsev A, Sundström V, Scheblykin IG. Giant photoluminescence blinking of perovskite nanocrystals reveals single-trap control of luminescence. Nano Lett 2015; 15:1603-8. [PMID: 25706329 DOI: 10.1021/nl5041397] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Fluorescence super-resolution microscopy showed correlated fluctuations of photoluminescence intensity and spatial localization of individual perovskite (CH3NH3PbI3) nanocrystals of size ∼200 × 30 × 30 nm(3). The photoluminescence blinking amplitude caused by a single quencher was a hundred thousand times larger than that of a typical dye molecule at the same excitation power density. The quencher is proposed to be a chemical or structural defect that traps free charges leading to nonradiative recombination. These trapping sites can be activated and deactivated by light.
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Affiliation(s)
- Yuxi Tian
- Chemical Physics, Lund University , Box 124, SE-22100, Lund, Sweden
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44
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Tian Y, Peter M, Unger E, Abdellah M, Zheng K, Pullerits T, Yartsev A, Sundström V, Scheblykin IG. Mechanistic insights into perovskite photoluminescence enhancement: light curing with oxygen can boost yield thousandfold. Phys Chem Chem Phys 2015; 17:24978-87. [DOI: 10.1039/c5cp04410c] [Citation(s) in RCA: 282] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Propagation of the light-induced trap passivation reaction through a thick perovskite crystal.
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Affiliation(s)
- Yuxi Tian
- Chemical Physics
- Lund University
- Lund
- Sweden
| | | | - Eva Unger
- Chemical Physics
- Lund University
- Lund
- Sweden
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45
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Jin A, Fu S, Sakurai A, Liu L, Edman F, Pullerits T, Öwall V, Karki KJ. Note: High precision measurements using high frequency gigahertz signals. Rev Sci Instrum 2014; 85:126102. [PMID: 25554338 DOI: 10.1063/1.4903461] [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: 06/04/2023]
Abstract
Generalized lock-in amplifiers use digital cavities with Q-factors as high as 5 × 10(8) to measure signals with very high precision. In this Note, we show that generalized lock-in amplifiers can be used to analyze microwave (giga-hertz) signals with a precision of few tens of hertz. We propose that the physical changes in the medium of propagation can be measured precisely by the ultra-high precision measurement of the signal. We provide evidence to our proposition by verifying the Newton's law of cooling by measuring the effect of change in temperature on the phase and amplitude of the signals propagating through two calibrated cables. The technique could be used to precisely measure different physical properties of the propagation medium, for example, the change in length, resistance, etc. Real time implementation of the technique can open up new methodologies of in situ virtual metrology in material design.
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Affiliation(s)
- Aohan Jin
- Department of Electrical and Information Technology, Lund University, Ole Römers väg 3, 22363 Lund, Sweden
| | - Siyuan Fu
- Department of Electrical and Information Technology, Lund University, Ole Römers väg 3, 22363 Lund, Sweden
| | - Atsunori Sakurai
- Chemical Physics, Lund University, Getingevägen 60, 22241 Lund, Sweden
| | - Liang Liu
- Department of Electrical and Information Technology, Lund University, Ole Römers väg 3, 22363 Lund, Sweden
| | - Fredrik Edman
- Department of Electrical and Information Technology, Lund University, Ole Römers väg 3, 22363 Lund, Sweden
| | - Tõnu Pullerits
- Chemical Physics, Lund University, Getingevägen 60, 22241 Lund, Sweden
| | - Viktor Öwall
- Department of Electrical and Information Technology, Lund University, Ole Römers väg 3, 22363 Lund, Sweden
| | - Khadga Jung Karki
- Chemical Physics, Lund University, Getingevägen 60, 22241 Lund, Sweden
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46
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Seibt J, Pullerits T. Publisher's Note: “Combined treatment of relaxation and fluctuation dynamics in the calculation of two-dimensional electronic spectra” [J. Chem. Phys. 141, 114106 (2014)]. J Chem Phys 2014. [DOI: 10.1063/1.4897518] [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: 11/14/2022] Open
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47
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Seibt J, Pullerits T. Combined treatment of relaxation and fluctuation dynamics in the calculation of two-dimensional electronic spectra. J Chem Phys 2014; 141:114106. [DOI: 10.1063/1.4895401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Affiliation(s)
- Joachim Seibt
- Department of Chemical Physics, Lund University, Box 124, SE-2100 Lund, Sweden
| | - Tõnu Pullerits
- Department of Chemical Physics, Lund University, Box 124, SE-2100 Lund, Sweden
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48
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Zheng K, Žídek K, Abdellah M, Zhu N, Chábera P, Lenngren N, Chi Q, Pullerits T. Directed Energy Transfer in Films of CdSe Quantum Dots: Beyond the Point Dipole Approximation. J Am Chem Soc 2014; 136:6259-68. [DOI: 10.1021/ja411127w] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Kaibo Zheng
- Department
of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Karel Žídek
- Department
of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Mohamed Abdellah
- Department
of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
- Department
of Chemistry, Faculty of Science, South Valley University, Qena 83523, Egypt
| | - Nan Zhu
- Department
of Chemistry, Technical University of Denmark, DK-2800 Kongens
Lyngby, Denmark
| | - Pavel Chábera
- Department
of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Nils Lenngren
- Department
of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
| | - Qijin Chi
- Department
of Chemistry, Technical University of Denmark, DK-2800 Kongens
Lyngby, Denmark
| | - Tõnu Pullerits
- Department
of Chemical Physics, Lund University, Box 124, 22100, Lund, Sweden
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49
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Hansen T, Žídek K, Zheng K, Abdellah M, Chábera P, Persson P, Pullerits T. Orbital Topology Controlling Charge Injection in Quantum-Dot-Sensitized Solar Cells. J Phys Chem Lett 2014; 5:1157-1162. [PMID: 26274464 DOI: 10.1021/jz5001193] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Quantum-dot-sensitized solar cells are emerging as a promising development of dye-sensitized solar cells, where photostable semiconductor quantum dots replace molecular dyes. Upon photoexcitation of a quantum dot, an electron is transferred to a high-band-gap metal oxide. Swift electron transfer is crucial to ensure a high overall efficiency of the solar cell. Using femtosecond time-resolved spectroscopy, we find the rate of electron transfer to be surprisingly sensitive to the chemical structure of the linker molecules that attach the quantum dots to the metal oxide. A rectangular barrier model is unable to capture the observed variation. Applying bridge-mediated electron-transfer theory, we find that the electron-transfer rates depend on the topology of the frontier orbital of the molecular linker. This promises the capability of fine tuning the electron-transfer rates by rational design of the linker molecules.
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Affiliation(s)
- Thorsten Hansen
- ‡Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK 2100 Copenhagen Ø, Denmark
| | | | | | - Mohamed Abdellah
- ¶Department of Chemistry, Qena Faculty of Science, South Valley University, Qena 83523, Egypt
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50
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Karki KJ, Ma F, Zheng K, Zidek K, Mousa A, Abdellah MA, Messing ME, Wallenberg LR, Yartsev A, Pullerits T. Multiple exciton generation in nano-crystals revisited: consistent calculation of the yield based on pump-probe spectroscopy. Sci Rep 2014; 3:2287. [PMID: 23887181 PMCID: PMC3724175 DOI: 10.1038/srep02287] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [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: 02/26/2013] [Accepted: 07/08/2013] [Indexed: 12/02/2022] Open
Abstract
Multiple exciton generation (MEG) is a process in which more than one exciton is generated upon the absorption of a high energy photon, typically higher than two times the band gap, in semiconductor nanocrystals. It can be observed experimentally using time resolved spectroscopy such as the transient absorption measurements. Quantification of the MEG yield is usually done by assuming that the bi-exciton signal is twice the signal from a single exciton. Herein we show that this assumption is not always justified and may lead to significant errors in the estimated MEG yields. We develop a methodology to determine proper scaling factors to the signals from the transient absorption experiments. Using the methodology we find modest MEG yields in lead chalcogenide nanocrystals including the nanorods.
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Affiliation(s)
- Khadga J Karki
- Department of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden.
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