1
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Ghosh S, Pradhan B, Bandyopadhyay A, Skvortsova I, Zhang Y, Sternemann C, Paulus M, Bals S, Hofkens J, Karki KJ, Materny A. Rashba-Type Band Splitting Effect in 2D (PEA) 2PbI 4 Perovskites and Its Impact on Exciton-Phonon Coupling. J Phys Chem Lett 2024; 15:7970-7978. [PMID: 39077842 PMCID: PMC11318034 DOI: 10.1021/acs.jpclett.4c01957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2024] [Revised: 07/10/2024] [Accepted: 07/11/2024] [Indexed: 07/31/2024]
Abstract
Despite a few recent reports on Rashba effects in two-dimensional (2D) Ruddlesden-Popper (RP) hybrid perovskites, the precise role of organic spacer cations in influencing Rashba band splitting remains unclear. Here, using a combination of temperature-dependent two-photon photoluminescence (2PPL) and time-resolved photoluminescence spectroscopy, alongside density functional theory (DFT) calculations, we contribute to significant insights into the Rashba band splitting found for 2D RP hybrid perovskites. The results demonstrate that the polarity of the organic spacer cation is crucial in inducing structural distortions that lead to Rashba-type band splitting. Our investigations show that the intricate details of the Rashba band splitting occur for organic cations with low polarity but not for more polar ones. Furthermore, we have observed stronger exciton-phonon interactions due to the Rashba-type band splitting effect. These findings clarify the importance of selecting appropriate organic spacer cations to manipulate the electronic properties of 2D perovskites.
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Affiliation(s)
- Supriya Ghosh
- School
of Science, Constructor University, Campus Ring 1, 28759 Bremen, Germany
- Department
of Chemistry and Biochemistry, The Ohio
State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Bapi Pradhan
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Arkamita Bandyopadhyay
- Bremen
Center for Computational Materials Science, University of Bremen, 28359 Bremen, Germany
| | - Irina Skvortsova
- Electron
Microscopy for Materials Research, University
of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Yiyue Zhang
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | | | - Michael Paulus
- Fakultät
Physik/DELTA, Technische Universität
Dortmund, 44221 Dortmund, Germany
| | - Sara Bals
- Electron
Microscopy for Materials Research, University
of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Johan Hofkens
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Khadga J. Karki
- Guangdong
Technion Israel Institute of Technology, 241 Daxue Road, Shantou, Guangdong Province 515603, P. R. China
| | - Arnulf Materny
- School
of Science, Constructor University, Campus Ring 1, 28759 Bremen, Germany
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2
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Ghosh S, Rana D, Pradhan B, Donfack P, Hofkens J, Materny A. Raman Spectroscopy of Formamidinium-Based Lead Mixed-Halide Perovskite Bulk Crystals. Chemphyschem 2023; 24:e202300303. [PMID: 37544892 DOI: 10.1002/cphc.202300303] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 08/02/2023] [Accepted: 08/04/2023] [Indexed: 08/08/2023]
Abstract
In recent years, there has been an impressively fast technological progress in the development of highly efficient lead halide perovskite solar cells. Nonetheless, the stability of perovskite films and associated solar cells remains a source of uncertainty and necessitates sophisticated characterization techniques. Here, we report low- to mid-frequency resonant Raman spectra of formamidinium-based lead mixed-halide perovskites. The assignment of the different Raman lines in the measured spectra is assisted by DFT simulations of the Raman spectra of suitable periodic model systems. An important result of this work is that both experiment and theory point to an increase of the stability of the perovskite structure with increasing chloride doping concentration. In the Raman spectra, this is reflected by the appearance of new lines due to the formation of hydrogen bonds. Thus, higher chloride doping results in less torsional motion and lower asymmetric bending contributing to higher stability. This study yields a solid basis for the interpretation of the Raman spectra of formamidinium-based mixed-halide perovskites, furthering the understanding of the properties of these materials, which is essential for their full exploitation in solar cells.
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Affiliation(s)
- Supriya Ghosh
- School of Science, Constructor University, Campus Ring 1, 28759, Bremen, Germany
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio, 43210, USA
| | - Debkumar Rana
- School of Science, Constructor University, Campus Ring 1, 28759, Bremen, Germany
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489, Berlin, Germany
| | - Bapi Pradhan
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001, Heverlee, Belgium
| | - Patrice Donfack
- School of Science, Constructor University, Campus Ring 1, 28759, Bremen, Germany
| | - Johan Hofkens
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001, Heverlee, Belgium
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Arnulf Materny
- School of Science, Constructor University, Campus Ring 1, 28759, Bremen, Germany
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3
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Shi Q, Kumar P, Pullerits T. Temperature-Dependent Intensity Modulated Two-Photon Excited Fluorescence Microscopy for High Resolution Mapping of Charge Carrier Dynamics. ACS PHYSICAL CHEMISTRY AU 2023; 3:467-476. [PMID: 37780538 PMCID: PMC10540292 DOI: 10.1021/acsphyschemau.3c00013] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 06/23/2023] [Accepted: 06/27/2023] [Indexed: 10/03/2023]
Abstract
We present a temperature-dependent intensity modulated two-photon excited fluorescence microscopy technique that enables high-resolution quantitative mapping of charge carrier dynamics in perovskite microcrystal film. By disentangling the emission into harmonics of the excitation modulation frequency, we analyze the first and second order charge carrier recombination processes, including potential accumulation effects. Our approach allows for a quantitative comparison of different emission channels at a micrometer resolution. To demonstrate the effectiveness of the method, we applied it to a methylammonium lead bromide perovskite microcrystal film. We investigated the temperature-dependent modulated imaging, encompassing the exciton dissociation-association and charge carrier trapping-detrapping equilibrium. Additionally, we explored the potential freezing out of traps and the phase transition occurring at low temperatures.
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Affiliation(s)
- Qi Shi
- The
Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
| | - Pushpendra Kumar
- Department
of Physics, Kirori Mal College, University
of Delhi, Delhi 110007, India
| | - Tönu Pullerits
- The
Division of Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
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4
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Hu Q, Zhang C, Wu X, Liang G, Wang L, Niu X, Wang Z, Si WD, Han Y, Huang R, Xiao J, Sun D. Highly Effective Hybrid Copper(I) Iodide Cluster Emitter with Negative Thermal Quenched Phosphorescence for X-Ray Imaging. Angew Chem Int Ed Engl 2023; 62:e202217784. [PMID: 36647290 DOI: 10.1002/anie.202217784] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/15/2023] [Accepted: 01/16/2023] [Indexed: 01/18/2023]
Abstract
The low efficiency triplet emission of hybrid copper(I) iodide clusters is a critical obstacle to their further practical optoelectronic application. Herein, we present an efficient hybrid copper(I) iodide cluster emitter (DBA)4 Cu4 I4 , where the cooperation of excited state structure reorganization and the metallophilicity interaction enables ultra-bright triplet yellow-orange emission with a photoluminescence quantum yield over 94.9 %, and the phonon-assisted de-trapping process of exciton induces the negative thermal quenching effect at 80-300 K. We also investigate the potential of this emitter for X-ray imaging. The (DBA)4 Cu4 I4 wafer demonstrates a light yield higher than 104 photons MeV-1 and a high spatial resolution of ≈5.0 lp mm-1 , showing great potential in practical X-ray imaging applications. Our new copper(I) iodide cluster emitter can serve as a model for investigating the thermodynamic mechanism of photoluminescence in hybrid copper(I) halide phosphorescence materials.
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Affiliation(s)
- Qingsong Hu
- Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang, 441053, China.,Hubei Longzhong Laboratory, Xiangyang, 441000, Hubei, China
| | - Chengkai Zhang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan, 250100, P. R. China
| | - Xian Wu
- Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang, 441053, China.,Hubei Longzhong Laboratory, Xiangyang, 441000, Hubei, China
| | - Guijie Liang
- Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang, 441053, China.,Hubei Longzhong Laboratory, Xiangyang, 441000, Hubei, China
| | - Lei Wang
- Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang, 441053, China.,Hubei Longzhong Laboratory, Xiangyang, 441000, Hubei, China
| | - Xiaowei Niu
- Beijing Key Lab of Microstructure and Property of Advanced Materials, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
| | - Zhi Wang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan, 250100, P. R. China
| | - Wei-Dan Si
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan, 250100, P. R. China
| | - Yibo Han
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China
| | - Ruiqin Huang
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China
| | - Jiawen Xiao
- Beijing Key Lab of Microstructure and Property of Advanced Materials, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
| | - Di Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan, 250100, P. R. China
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5
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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] [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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6
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Synthesis, Photoluminescence and Vibrational Properties of Aziridinium Lead Halide Perovskites. Molecules 2022; 27:molecules27227949. [PMID: 36432050 PMCID: PMC9698367 DOI: 10.3390/molecules27227949] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/12/2022] [Accepted: 11/13/2022] [Indexed: 11/19/2022] Open
Abstract
Three-dimensional lead halide perovskites are known for their excellent optoelectronic properties, making them suitable for photovoltaic and light-emitting applications. Here, we report for the first time the Raman spectra and photoluminescent (PL) properties of recently discovered three-dimensional aziridinium lead halide perovskites (AZPbX3, X = Cl, Br, I), as well as assignment of vibrational modes. We also report diffuse reflection data, which revealed an extended absorption of light of AZPbX3 compared to the MA and FA counterparts and are beneficial for solar cell application. We demonstrated that this behavior is correlated with the size of the organic cation, i.e., the energy band gap of the cubic lead halide perovskites decreases with the increasing size of the organic cation. All compounds show intense PL, which weakens on heating and shifts toward higher energies. This PL is red shifted compared to the FA and MA counterparts. An analysis of the PL data revealed the small exciton binding energy of AZPbX3 compounds (29-56 meV). Overall, the properties of AZPbX3 are very similar to those of the well-known MAPbX3 and FAPbX3 perovskites, indicating that the aziridinium analogues are also attractive materials for light-emitting and solar cell applications.
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7
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Wei Q, Meng X, Lin W, Ge S, Han X, Chen L, Zeng R, Zou B. Green Triplet Self-Trapped Exciton Emission in Layered Rb 3Cd 2Cl 7:Sb 3+ Perovskite: Comparison with RbCdCl 3:Sb 3. J Phys Chem Lett 2022; 13:8436-8446. [PMID: 36053059 DOI: 10.1021/acs.jpclett.2c02092] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Metal halide materials have recently sparked intense research because of their excellent photophysical properties and chemical stability. For example, RbCdCl3:Sb3+ exhibits broad emission at about 600 nm with a high photoluminescence quantum yield (PLQY) over 91% and double emission bands with bright white color. Herein, we obtained a novel Rb and Cd layered perovskite Rb3Cd2Cl7 doped with Sb3+, which gives luminescence at 525 nm with a large Stokes shift of 200 nm, originating from a self-trapped exciton (STE). Its PLQY is 57.47%, but its low-temperature PLQY becomes much higher at the same wavelength. When Rb3Cd2Cl7:Sb3+ and RbCdCl3:Sb3+ were compared, the two classes of quantum confinement effects by Rb and Cd ions in the lattice were identified to describe their electronic states and different optical properties. These results suggest that properties of Sb-doped cadmium halides could be modified by the structure type and local atomic confinement to find applications as promising luminescent materials for optoelectronic devices.
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Affiliation(s)
- Qilin Wei
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
| | - Xianfu Meng
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
| | - Wenchao Lin
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
| | - Shuaigang Ge
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
| | - Xinxin Han
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
| | - Li Chen
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
| | - Ruosheng Zeng
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
| | - Bingsuo Zou
- School of Physical Science and Technology; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and materials, Guangxi University, Nanning530004, China
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8
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Chen J, Zhang W, Pullerits T. Two-photon absorption in halide perovskites and their applications. MATERIALS HORIZONS 2022; 9:2255-2287. [PMID: 35727018 DOI: 10.1039/d1mh02074a] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Active research on halide perovskites has given us a deep understanding of this family of materials and their potential for applications in advanced optoelectronic devices. One of the prominent outcomes is the use of perovskite materials for nonlinear optical applications. Two-photon absorption in perovskites, in particular their nanostructures, has been extensively studied and shows huge promise for many applications. However, we are still far from a thorough understanding of two-photon absorption in halide perovskites from a micro to macro perspective. Here we summarize different techniques for studying the two-photon absorption in nonlinear optical materials. We discuss the in-depth photophysics in two-photon absorption in halide perovskites. A comprehensive summary about the factors which influence two-photon absorption provides the direction to improve the two-photon absorption properties of halide perovskites. A summary of the recent applications of two-photon absorption in halide perovskites provides inspirations for engineers to utilize halide perovskites in two-photon absorption device development. This review will help readers to have a comprehensive and in-depth understanding of the research field of two-photon absorption of halide perovskites from microscopic mechanisms to applications. The article can serve as a manual and give inspiration for future researchers.
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Affiliation(s)
- Junsheng Chen
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Wei Zhang
- Chemical Physics and NanoLund, Lund University, Box 124, Lund 22100, Sweden.
| | - Tönu Pullerits
- Chemical Physics and NanoLund, Lund University, Box 124, Lund 22100, Sweden.
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9
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Kaur G, Shukla A, Babu KJ, Ghosh HN. Chemically Engineered Avenues: Opportunities for Attaining Desired Carrier Cooling in Perovskites. CHEM REC 2022; 22:e202200106. [PMID: 35882519 DOI: 10.1002/tcr.202200106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 06/29/2022] [Accepted: 07/07/2022] [Indexed: 11/11/2022]
Abstract
Hot carrier extraction-based devices are presently being persuaded as the most revolutionary means of surpassing the theoretical thermodynamic conversion efficiency limit (∼67 % for a model hot carrier solar cell). However, for practical realisation, there stand various hurdles that need to be surmounted, a major among all being the rapid hot carrier cooling rate. Though, the perovskite family has already demonstrated itself to exhibit slower cooling in contrast to the prototypical semiconductors. Decelerating this entire process of cooling further can prove to be a crucial stride in this regard. Quite contrarily, for the optoelectronic applications the situation is entirely conflicting where quick rate of cooling is a chief prerequisite. In the recent times, there have been various key developments that have targeted altering this cooling rate by various chemically engineered strategies. This review highlights such blueprints that can be utilized towards the advantageous alteration of the carrier cooling in accordance with the device requirements.
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Affiliation(s)
- Gurpreet Kaur
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India
| | - Ayushi Shukla
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India
| | - K Justice Babu
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India.,RPC Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 40085, India
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10
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Singh A, Dey P, Kumari A, Sikdar MK, Sahoo PK, Das R, Maiti T. Temperature-dependent excitonic emission characteristics of lead-free inorganic double perovskites and their third-order optical nonlinearities. Phys Chem Chem Phys 2022; 24:4065-4076. [PMID: 35103739 DOI: 10.1039/d1cp04896a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report temperature-dependent photoluminescence (PL) in the temperature range between 77 K and 300 K, and room temperature nonlinear optical (NLO) properties of solution processed lead-free Cs2NaBiI6 (CNBI) and Cs2KBiI6 (CKBI) perovskite films. The de-convolution analysis of temperature-dependent PL spectra showed thermal quenching behavior of free-exciton (FX) emission, an unusual blue-shift of PL emission, and line broadening with increasing temperature as a consequence of strong exciton-phonon interaction. The nonlinear refractive index (n2) and nonlinear absorption coefficient (β) of both the CNBI and CKBI films are determined using a closed aperture (CA) and open aperture (OA) Z-scan technique, respectively. Both the CNBI and CKBI perovskites exhibited features of saturable absorption (SA) with β ∼ -6.23 × 10-12 cm W-1, and -1.14× 10-12 cm W-1, respectively. The CA measurements depicted a self-defocusing effect in both the samples with n2 values ∼-1.06 × 10-14 cm2 W-1 and -1.337× 10-14 cm2 W-1, respectively. With such emission and NLO characteristics, CNBI and CKBI perovskite films can be used for designing eco-friendly optoelectronic and NLO devices.
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Affiliation(s)
- Avanendra Singh
- Plasmonics and Perovskites Laboratory (PPL), Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, UP, India.
| | - Pritam Dey
- Plasmonics and Perovskites Laboratory (PPL), Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, UP, India.
| | - Anupa Kumari
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, Odisha, India
| | - Mrinal Kanti Sikdar
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, Odisha, India
| | - Pratap K Sahoo
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, Odisha, India
| | - Ritwick Das
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, Odisha, India
| | - Tanmoy Maiti
- Plasmonics and Perovskites Laboratory (PPL), Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, UP, India.
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11
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Leng J, Wang T, Tan ZK, Lee YJ, Chang CC, Tamada K. Tuning the Emission Wavelength of Lead Halide Perovskite NCs via Size and Shape Control. ACS OMEGA 2022; 7:565-577. [PMID: 35036724 PMCID: PMC8756606 DOI: 10.1021/acsomega.1c05001] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 11/23/2021] [Indexed: 06/14/2023]
Abstract
The advent of lead halide perovskite nanocrystals (NCs), which are easily synthesized, ultralow-cost materials and have an impeccable luminous efficiency, has drastically changed the future perspective of semiconductor quantum dot devices. Although the band gap energy of lead perovskite NCs can be tuned by the halide composition, the instability problem prevails for mixed-halide perovskite NCs, caused by phase segregation due to ion migration when an external electric field or light is applied. To avoid this problem and obtain the stable emission of RGB primary colors, in this study, two synthesis pathways of pure-halide perovskite NCs are proposed. One approach is the modified hot injection method with "centrifugation of a frozen eutectic mixture" to separate small NCs efficiently, and the other is the "low-temperature mixing and heat-up method" for target materials including CsPbI3, CsPbBr3, and CH(NH2)2PbBr3 (FAPbBr3). The emission wavelength of FAPbBr3 is tuned ion-stoichiometrically, unlike Cs perovskites. These various synthesis pathways of pure-halide perovskite NCs enable the efficient production of high-quality perovskite NCs and allow precise tuning of the emission color to the desired wavelength. Although there are still several "gaps" remaining in the available emission wavelength, the new methodology proposed in this study could potentially be employed for manufacturing more stable perovskite NC-based optoelectronic devices.
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Affiliation(s)
- Junfu Leng
- Institute
for Materials Chemistry and Engineering (IMCE), Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan
| | - Tian Wang
- Department
of Chemistry, National University of Singapore
(NUS), 3 Science Drive 3, Singapore 117543, Singapore
| | - Zhi-Kuang Tan
- Department
of Chemistry, National University of Singapore
(NUS), 3 Science Drive 3, Singapore 117543, Singapore
| | - Ya-Ju Lee
- Institute
of Electro-Optical Engineering, National
Taiwan Normal University, 88, Sec. 4, Ting-Chou Rd., Taipei 116, Taiwan
| | - Chun-Chieh Chang
- Institute
of Electro-Optical Engineering, National
Taiwan Normal University, 88, Sec. 4, Ting-Chou Rd., Taipei 116, Taiwan
| | - Kaoru Tamada
- Institute
for Materials Chemistry and Engineering (IMCE), Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan
- Advanced
Institute for Materials Research (AIMR), Tohoku University, 2-1-1
Katahira, Aoba-ku, Sendai 980-8577, Japan
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12
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Iaru CM, Brodu A, van Hoof NJJ, Ter Huurne SET, Buhot J, Montanarella F, Buhbut S, Christianen PCM, Vanmaekelbergh D, de Mello Donega C, Rivas JG, Koenraad PM, Silov AY. Fröhlich interaction dominated by a single phonon mode in CsPbBr 3. Nat Commun 2021; 12:5844. [PMID: 34615880 PMCID: PMC8494801 DOI: 10.1038/s41467-021-26192-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 09/17/2021] [Indexed: 12/02/2022] Open
Abstract
The excellent optoelectronic performance of lead halide perovskites has generated great interest in their fundamental properties. The polar nature of the perovskite lattice means that electron-lattice coupling is governed by the Fröhlich interaction. Still, considerable ambiguity exists regarding the phonon modes that participate in this crucial mechanism. Here, we use multiphonon Raman scattering and THz time-domain spectroscopy to investigate Fröhlich coupling in CsPbBr3. We identify a longitudinal optical phonon mode that dominates the interaction, and surmise that this mode effectively defines exciton-phonon scattering in CsPbBr3, and possibly similar materials. It is additionally revealed that the observed strength of the Fröhlich interaction is significantly higher than the expected intrinsic value for CsPbBr3, and is likely enhanced by carrier localization in the colloidal perovskite nanocrystals. Our experiments also unearthed a dipole-related dielectric relaxation mechanism which may impact transport properties. Electron-phonon interaction is essential for understanding electronic and optical properties of lead halide perovskites. Here, using multiphonon Raman scattering and THz time-domain spectroscopy, the authors characterize the full phonon spectrum of CsPbBr3 and identify a single phonon mode that dominates electron-phonon scattering.
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Affiliation(s)
- Claudiu M Iaru
- Department of Applied Physics and Institute for Photonic Integration, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.
| | - Annalisa Brodu
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3508 TA, Utrecht, The Netherlands
| | - Niels J J van Hoof
- Department of Applied Physics and Institute for Photonic Integration, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Stan E T Ter Huurne
- Department of Applied Physics and Institute for Photonic Integration, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Jonathan Buhot
- HH Wills Laboratory, University of Bristol, Bristol, BS8 1TL, UK.,High Field Magnet Laboratory (HFML - EMFL), Radboud University, 6525 ED, Nijmegen, The Netherlands
| | - Federico Montanarella
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3508 TA, Utrecht, The Netherlands
| | - Sophia Buhbut
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3508 TA, Utrecht, The Netherlands
| | - Peter C M Christianen
- High Field Magnet Laboratory (HFML - EMFL), Radboud University, 6525 ED, Nijmegen, The Netherlands
| | - Daniël Vanmaekelbergh
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3508 TA, Utrecht, The Netherlands
| | - Celso de Mello Donega
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3508 TA, Utrecht, The Netherlands
| | - Jaime Gòmez Rivas
- Department of Applied Physics and Institute for Photonic Integration, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Paul M Koenraad
- Department of Applied Physics and Institute for Photonic Integration, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Andrei Yu Silov
- Department of Applied Physics and Institute for Photonic Integration, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.
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13
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Yang B, Han K. Ultrafast Dynamics of Self-Trapped Excitons in Lead-Free Perovskite Nanocrystals. J Phys Chem Lett 2021; 12:8256-8262. [PMID: 34424715 DOI: 10.1021/acs.jpclett.1c01828] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Lead-free halide perovskite nanocrystals (NCs) have received increasing attention owing to their low toxicity and high stability. Localized charge distribution and strong carrier-phonon coupling in lead-free perovskite NCs facilitates the formation of self-trapped excitons (STEs), which typically give a broadband photoluminescence (PL) emission with a large Stokes shift. In this Perspective, we highlight how PL modulations can give rise to an efficient white-light emission by understanding and tuning the ultrafast dynamics of STEs in lead-free perovskite NCs. We then present the exciton energy transfer mediated by STEs to provide an efficient thermally activated delayed fluorescence and dopant PL. We also illustrate promising directions for future applications based on STEs. We hope that this Perspective can provide a new viewpoint for researchers to understand the ultrafast dynamics of STEs and promote lead-free perovskite NCs for optoelectronic applications.
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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 100049, 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
- University of the Chinese Academy of sciences, Beijing 100049, P.R. China
- Institute of Molecular Sciences and Engineering, Shandong University, Qingdao, P.R. China
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14
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Ahmed I, Shi L, Pasanen H, Vivo P, Maity P, Hatamvand M, Zhan Y. There is plenty of room at the top: generation of hot charge carriers and their applications in perovskite and other semiconductor-based optoelectronic devices. LIGHT, SCIENCE & APPLICATIONS 2021; 10:174. [PMID: 34465725 PMCID: PMC8408272 DOI: 10.1038/s41377-021-00609-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 07/22/2021] [Accepted: 07/31/2021] [Indexed: 06/13/2023]
Abstract
Hot charge carriers (HC) are photoexcited electrons and holes that exist in nonequilibrium high-energy states of photoactive materials. Prolonged cooling time and rapid extraction are the current challenges for the development of future innovative HC-based optoelectronic devices, such as HC solar cells (HCSCs), hot energy transistors (HETs), HC photocatalytic reactors, and lasing devices. Based on a thorough analysis of the basic mechanisms of HC generation, thermalization, and cooling dynamics, this review outlines the various possible strategies to delay the HC cooling as well as to speed up their extraction. Various materials with slow cooling behavior, including perovskites and other semiconductors, are thoroughly presented. In addition, the opportunities for the generation of plasmon-induced HC through surface plasmon resonance and their technological applications in hybrid nanostructures are discussed in detail. By judiciously designing the plasmonic nanostructures, the light coupling into the photoactive layer and its optical absorption can be greatly enhanced as well as the successful conversion of incident photons to HC with tunable energies can also be realized. Finally, the future outlook of HC in optoelectronics is highlighted which will provide great insight to the research community.
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Affiliation(s)
- Irfan Ahmed
- State Key Laboratory of ASIC and System, Centre of Micro-Nano System, SIST, Fudan University, 200433, Shanghai, China.
- Department of Physics, Government Postgraduate College, (Higher Education Department-HED) Khyber Pakhtunkhwa, 21300, Mansehra, Pakistan.
| | - Lei Shi
- State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonics, Fudan University, 200433, Shanghai, China
| | - Hannu Pasanen
- Faculty of Engineering and Natural Sciences, Tampere University, FI-33014, Tampere, Finland
| | - Paola Vivo
- Faculty of Engineering and Natural Sciences, Tampere University, FI-33014, Tampere, Finland
| | - Partha Maity
- KAUST Solar Center, Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Riyadh, Kingdom of Saudi Arabia
| | - Mohammad Hatamvand
- State Key Laboratory of ASIC and System, Centre of Micro-Nano System, SIST, Fudan University, 200433, Shanghai, China
| | - Yiqiang Zhan
- State Key Laboratory of ASIC and System, Centre of Micro-Nano System, SIST, Fudan University, 200433, Shanghai, China.
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15
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Song L, Huang L, Liu Y, Hu Y, Guo X, Chang Y, Geng C, Xu S, Zhang Z, Zhang Y, Luan N. Efficient and Stable Blue Perovskite Light-Emitting Devices Based on Inorganic Cs 4PbBr 6 Spaced Low-Dimensional CsPbBr 3 through Synergistic Control of Amino Alcohols and Polymer Additives. ACS APPLIED MATERIALS & INTERFACES 2021; 13:33199-33208. [PMID: 34233117 DOI: 10.1021/acsami.1c02555] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Perovskite light-emitting devices (PeLEDs) have drawn a great deal of attention because of their exceptional optical and electrical properties. However, as for the blue PeLEDs based on low-dimensional (LD) CsPbBr3, the low conductivity of the widely used organic spacers as well as the difficulty of forming pure and uniform LD CsPbBr3 phase have severely inhibited the device performance such as stability and efficiency. In this work, we report an effective strategy to obtain high-quality LD CsPbBr3 by using a novel spacer of inorganic Cs4PbBr6 instead of the common long-chain ammonium halides. We found that a 3-amino-1-propanol (3AP)-modified PEDOT:PSS was helpful to stimulate the formation of the LD blue emissive CsPbBr3:Cs4PbBr6 composite. We also revealed that an additive of poly(vinylpyrrolidone) (PVP) in the precursor can limit further growth of LD perovskite phase into 3D perovskite phase upon annealing, thus resulting in a uniformly distributed LD perovskite with high color stability. Consequently, efficient blue PeLEDs @ 485 nm with a brightness of 2192 cd/m2, current efficiency of 2.68 cd/A, and external quantum efficiency of 2.3% was successfully achieved. More importantly, the device showed much improved working stability compared to those with the spacer of organic ammonium halides. Our results provide some helpful insights into developing efficient and stable blue PeLEDs.
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Affiliation(s)
- Li Song
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Lixin Huang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Yuan Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Yongsheng Hu
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Xiaoyang Guo
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
| | - Yulei Chang
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
| | - Chong Geng
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Shu Xu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Zihui Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Yonghui Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Nannan Luan
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
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16
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Veronese A, Ciarrocchi C, Marelli M, Quadrelli P, Patrini M, Malavasi L. Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering. FRONTIERS IN ELECTRONICS 2021. [DOI: 10.3389/felec.2021.703182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In order to overcome the toxicity of lead halide perovskites, in recent years the research has focused on replacing lead with more environmentally friendly metals like tin, germanium, bismuth or antimony. However, lead-free perovskites still present instability issues and low performances that do not make them competitive when compared to their lead-based counterparts. Here we report the synthesis of lead-free Cs2SnX6 (X = Br, I) nanostructures of different shapes by using various surface ligands. These compounds are a promising alternative to lead halide perovskites in which the replacement of divalent lead (Pb(II)) with tetravalent tin (Sn(IV)) causes a modification of the standard perovskite structure. We investigate the effects of different amines on the morphology and size of Cs2SnX6 (X = Br, I) nanocrystals, presenting a facile hot-infection method to directly synthesize three-dimensional (3D) nanoparticles as well as two-dimensional (2D) nanoplatelets. The amines not only modify the shape of the crystals, but also affect their optical properties: increasing the length of the amine carbon chain we observe a widening in the bandgap of the compounds and a blue-shift of their emission peak. Alongside the tuning of the chemical composition and the reduction of the crystal size, our study offers a new insight in controlling the physical properties of perovskite nanocrystals by means of the capping ligands, paving the way for future research on lead-free materials.
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17
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Rubino A, Francisco-López A, Barker AJ, Petrozza A, Calvo ME, Goñi AR, Míguez H. Disentangling Electron-Phonon Coupling and Thermal Expansion Effects in the Band Gap Renormalization of Perovskite Nanocrystals. J Phys Chem Lett 2021; 12:569-575. [PMID: 33382272 DOI: 10.1021/acs.jpclett.0c03042] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The complex electron-phonon interaction occurring in bulk lead halide perovskites gives rise to anomalous temperature dependences, like the widening of the electronic band gap as temperature increases. However, possible confinement effects on the electron-phonon coupling in the nanocrystalline version of these materials remain unexplored. Herein, we study the temperature (ranging from 80 K to ambient) and hydrostatic pressure (from atmospheric to 0.6 GPa) dependence of the photoluminescence of ligand-free methylammonium lead triiodide nanocrystals with controlled sizes embedded in a porous silica matrix. This analysis allowed us to disentangle the effects of thermal expansion and electron-phonon interaction. As the crystallite size decreases, the electron-phonon contribution to the gap renormalization gains in importance. We provide a plausible explanation for this observation in terms of quantum confinement effects, showing that neither thermal expansion nor electron-phonon coupling effects may be disregarded when analyzing the temperature dependence of the optoelectronic properties of perovskite lead halide nanocrystals.
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Affiliation(s)
- Andrea Rubino
- Institute of Materials Science of Seville, Spanish National Research Council-University of Seville, C/Américo Vespucio 49, 41092 Seville, Spain
| | - Adrián Francisco-López
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Alex J Barker
- Center for Nano Science and Technology @PoliMi, Instituto Italiano di Tecnologia, via G. Pascoli 70/3, 20133 Milan, Italy
| | - Annamaria Petrozza
- Center for Nano Science and Technology @PoliMi, Instituto Italiano di Tecnologia, via G. Pascoli 70/3, 20133 Milan, Italy
| | - Mauricio E Calvo
- Institute of Materials Science of Seville, Spanish National Research Council-University of Seville, C/Américo Vespucio 49, 41092 Seville, Spain
| | - Alejandro R Goñi
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | - Hernán Míguez
- Institute of Materials Science of Seville, Spanish National Research Council-University of Seville, C/Américo Vespucio 49, 41092 Seville, Spain
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18
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Ghosh S, Pradhan B, Zhang Y, Hofkens J, Karki KJ, Materny A. Nature of the different emissive states and strong exciton-phonon couplings in quasi-two-dimensional perovskites derived from phase-modulated two-photon micro-photoluminescence spectroscopy. Phys Chem Chem Phys 2021; 23:3983-3992. [PMID: 33554234 DOI: 10.1039/d0cp05538g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Quasi two-dimensional perovskites have attracted great attention for applications in light-emitting devices and photovoltaics due to their robustness and tunable highly efficient photoluminescence (PL). However, the mechanism of intrinsic PL in these materials is still not fully understood. In this work, we have analysed the nature of the different emissive states and the impact of temperature on the emissions in quasi two-dimensional methyl ammonium lead bromide perovskite (q-MPB) and cesium lead bromide perovskite (q-CPB). We have used spatially resolved phase-modulated two-photon photoluminescence (2PPL) and temperature-dependent 2PPL to characterize the emissions. Our results show that at room temperature, the PL from q-MPB is due to the recombination of excitons and free carriers while the PL from q-CPB is due to the recombination of excitons only. Temperature-dependent measurements show that in both materials the linewidth broadening is due to the interactions between the excitons and optical phonons at high temperatures. Comparing the characteristics of the emissions in the two systems, we conclude that q-CPB is better suited for light emitting devices. With a further optimization to reduce the impact on the environment, q-CPB-based LEDs could perform as well as OLEDs.
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Affiliation(s)
- Supriya Ghosh
- Department of Physics and Earth Sciences, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany.
| | - Bapi Pradhan
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium.
| | - Yiyue Zhang
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium.
| | - Johan Hofkens
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium. and Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Khadga J Karki
- Phutung Research Institute, Devisthan-marg 5, Goldhunga, Tarakeshwor 5, Kathmandu, 44611, Nepal.
| | - Arnulf Materny
- Department of Physics and Earth Sciences, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany.
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19
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Wang X, Wang Q, Chai Z, Wu W. The thermal stability of FAPbBr 3 nanocrystals from temperature-dependent photoluminescence and first-principles calculations. RSC Adv 2020; 10:44373-44381. [PMID: 35517129 PMCID: PMC9058516 DOI: 10.1039/d0ra07668f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 11/10/2020] [Indexed: 01/23/2023] Open
Abstract
The temperature dependence of FAPbBr3 perovskite nanocrystals (PNCs) is investigated experimentally by steady-state and time-resolved photoluminescence (PL) spectroscopies. With the temperature increase, photon energies of line width and emission peak become larger due to stronger exciton-phonon coupling. Furthermore, theoretical calculations of first-principles simulations are used to estimate comparatively the thermal stability of typical FAPbBr3 PNCs. It is found that the PL peaks of PNCs slightly change with increasing temperature below 175 K and then blueshift steeply decreases rapidly till 400 K, which is related to phase transition from orthorhombic to tetragonal and cubic phase. The simulated results show the PL and the crystal structure of FAPbBr3 are largely dependent on the temperature. With higher temperature, the photon energy of the PL peak becomes larger, and the calculated band gap of FAPbBr3 is about 2.15 eV at 80 K, which is in good agreement with the experimental results. It is confirmed that temperature-dependent PL is composed of a band-edge exciton state and trapping state emission. The results obtained will be of certain significance to further expand other hybrid organometal perovskite materials.
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Affiliation(s)
- Xiaozhe Wang
- School of Electronic Engineering, Heilongjiang University Harbin Heilongjiang 150080 China
| | - Qi Wang
- School of Electronic Engineering, Heilongjiang University Harbin Heilongjiang 150080 China
| | - Zhijun Chai
- School of Electronic Engineering, Heilongjiang University Harbin Heilongjiang 150080 China
| | - Wenzhi Wu
- School of Electronic Engineering, Heilongjiang University Harbin Heilongjiang 150080 China
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20
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Peng S, Wei Q, Wang B, Zhang Z, Yang H, Pang G, Wang K, Xing G, Sun XW, Tang Z. Suppressing Strong Exciton–Phonon Coupling in Blue Perovskite Nanoplatelet Solids by Binary Systems. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Shaomin Peng
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Qi Wei
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Bingzhe Wang
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Zhipeng Zhang
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Hongcheng Yang
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Guotao Pang
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Kai Wang
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Guichuan Xing
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Xiao Wei Sun
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Zikang Tang
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
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21
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Peng S, Wei Q, Wang B, Zhang Z, Yang H, Pang G, Wang K, Xing G, Sun XW, Tang Z. Suppressing Strong Exciton–Phonon Coupling in Blue Perovskite Nanoplatelet Solids by Binary Systems. Angew Chem Int Ed Engl 2020; 59:22156-22162. [DOI: 10.1002/anie.202009193] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/03/2020] [Indexed: 01/10/2023]
Affiliation(s)
- Shaomin Peng
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Qi Wei
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Bingzhe Wang
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Zhipeng Zhang
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Hongcheng Yang
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Guotao Pang
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Kai Wang
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Guichuan Xing
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
| | - Xiao Wei Sun
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
| | - Zikang Tang
- Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
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22
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Self-trapped exciton engineering for white-light emission in colloidal lead-free double perovskite nanocrystals. Sci Bull (Beijing) 2020; 65:1078-1084. [PMID: 36659159 DOI: 10.1016/j.scib.2020.03.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 02/12/2020] [Accepted: 02/26/2020] [Indexed: 01/21/2023]
Abstract
Intrinsic broadband photoluminescence (PL) of self-trapped excitons (STEs) are systematically studied in lead-free double perovskite nanocrystals (NCs). It is clarified that bandgap (direct/indirect) has important influence on the PL properties of STEs: indirect bandgap NCs exhibit strong exciton-phonon coupling which results in non-radiative STEs, while direct bandgap NCs exhibit moderate exciton-phonon coupling, inducing bright STE PL. Furthermore, by alloying K+ and Li+ ions in Cs2AgInCl6 NCs, the NCs exhibit broadband white-light emission. Charge-carrier dynamics study indicates that the efficient white-light emission originates from the further suppressed non-radiative processes of the STEs in the direct bandgap structure. This work may deepen the understanding of STEs and guide the design of high-performance lead-free perovskites.
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23
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Zhong M, Zhao Z, Luo Y, Zhou F, Peng Y, Yin Y, Zhou W, Tang D. Stable green and red dual-color emission in all-inorganic halide-mixed perovskite single microsheets. RSC Adv 2020; 10:18368-18376. [PMID: 35517236 PMCID: PMC9053764 DOI: 10.1039/d0ra02068k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 05/06/2020] [Indexed: 11/21/2022] Open
Abstract
Recently, all-inorganic perovskites have attracted tremendous attention due to their excellent optoelectronic properties and extensive potential applications. However, these perovskites usually show a single emission wavelength because of the high ionic migration. Herein, we synthesized all-inorganic halide-mixed perovskite CsPbBr x I3-x microsheets with high crystal quality using the anti-solvent solution method and observed extraordinary green and red dual-color emission in single CsPbBr x I3-x microsheets. Power dependent PL spectra reveal excitonic and defect related recombination features of CsPbBr3 and CsPbI3 for the green and red emission. Temperature dependent PL spectra indicated a distinctive exciton-phonon coupling strength in CsPbBr x I3-x microsheets compared with pure CsPbBr3 and CsPbI3. The PL dynamics showing longer emission lifetime further confirmed this conclusion. Our work not only provides a novel strategy to produce stable dual-color emission integration, but also promotes the fundamental insight into the emission dynamics and exciton/free carrier related photophysics in all-inorganic halide-mixed perovskites.
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Affiliation(s)
- Manyi Zhong
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University Changsha 410081 People's Republic of China
| | - Zhuang Zhao
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University Changsha 410081 People's Republic of China
| | - Yuan Luo
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University Changsha 410081 People's Republic of China
| | - Fang Zhou
- Department of Basic Course, Hunan Police Academy Changsha 410138 People's Republic of China
| | - Yuehua Peng
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University Changsha 410081 People's Republic of China
| | - Yanling Yin
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University Changsha 410081 People's Republic of China
| | - Weichang Zhou
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University Changsha 410081 People's Republic of China
- Key Laboratory for Matter Microstructure and Function of Hunan Province, Synergetic Innovation Center for Quantum Effects and Application, Hunan Normal University Changsha 410081 People's Republic of China
| | - Dongsheng Tang
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University Changsha 410081 People's Republic of China
- Key Laboratory for Matter Microstructure and Function of Hunan Province, Synergetic Innovation Center for Quantum Effects and Application, Hunan Normal University Changsha 410081 People's Republic of China
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24
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Zeng R, Zhang L, Xue Y, Ke B, Zhao Z, Huang D, Wei Q, Zhou W, Zou B. Highly Efficient Blue Emission from Self-Trapped Excitons in Stable Sb 3+-Doped Cs 2NaInCl 6 Double Perovskites. J Phys Chem Lett 2020; 11:2053-2061. [PMID: 32105076 DOI: 10.1021/acs.jpclett.0c00330] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Highly efficient blue-emitting three-dimensional (3D) lead-free halide perovskites with excellent stability have attracted worldwide attention. Herein, a doping route was adopted to incorporate Sb3+ ions into the Cs2NaInCl6 for decorating the electronic band structure. Due to the moderate electron-phonon coupling, the Sb3+-doped Cs2NaInCl6 double perovskites showed a narrow and relatively unusual blue emission of self-trapped excitons (STEs). Density functional theory (DFT) calculation indicated that the doped Sb3+ ions could break the parity-forbidden transition rule and modulate the density of state (DOS) population effectively to boost the PLQY of STEs drastically. The optimized Sb3+:Cs2NaInCl6 exhibited a PLQY of up to 75.89% and excellent stability under the consecutive illumination of 365 nm UV light for 1000 h. This kind of highly efficient lead-free Sb3+-doped Cs2NaInCl6 double perovskites may overcome the bottlenecks of severe toxicity and insufficient stability and therefore have an extensive application in the scarce blue photonic and optoelectronic fields.
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Affiliation(s)
- Ruosheng Zeng
- School of Materials Science and Engineering, School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, People's Republic of China
- School of Physical Science and Technology, Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials (Ministry of Education), Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, People's Republic of China
| | - Leilei Zhang
- School of Materials Science and Engineering, School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, People's Republic of China
| | - Yang Xue
- School of Physical Science and Technology, Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials (Ministry of Education), Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, People's Republic of China
| | - Bao Ke
- School of Materials Science and Engineering, School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, People's Republic of China
| | - Zhuang Zhao
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, People's Republic of China
| | - Dan Huang
- School of Physical Science and Technology, Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials (Ministry of Education), Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, People's Republic of China
| | - Qilin Wei
- School of Physical Science and Technology, Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials (Ministry of Education), Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, People's Republic of China
| | - Weichang Zhou
- School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, People's Republic of China
- Key Laboratory for Matter Microstructure and Function of Hunan Province, Synergetic Innovation Center for Quantum Effects and Application, Hunan Normal University, Changsha 410081, People's Republic of China
| | - Bingsuo Zou
- School of Physical Science and Technology, Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials (Ministry of Education), Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, People's Republic of China
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25
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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] [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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26
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Camargo FVA, Nagahara T, Feldmann S, Richter JM, Friend RH, Cerullo G, Deschler F. Dark Subgap States in Metal-Halide Perovskites Revealed by Coherent Multidimensional Spectroscopy. J Am Chem Soc 2020; 142:777-782. [PMID: 31851510 DOI: 10.1021/jacs.9b07169] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Metal-halide perovskites show excellent properties for photovoltaic and optoelectronic applications, with power conversion efficiencies of solar cell and LEDs exceeding 20%. Being solution processed, these polycrystalline materials likely contain a large density of defects compared to melt-grown semiconductors. Surprisingly, typical effects from defects (absorption below the bandgap, low fill factor and open circuit voltage in devices, strong nonradiative recombination) are not observed. In this work, we study thin films of metal-halide perovskites CH3NH3PbX3 (X = Br, I) with ultrafast multidimensional optical spectroscopy to resolve the dynamics of band and defect states. We observe a shared ground state between the band-edge transitions and a continuum of sub-bandgap states, which extends at least 350 meV below the band edge). We explain the comparatively large bleaching of the dark sub-bandgap states with oscillator strength borrowing from the band-edge transition. Our results show that upon valence to conduction band excitation, such subgap states are instantaneously bleached for large parts of the carrier lifetime and conversely that most dark sub-bandgap states can be populated by light excitation. This observation helps to unravel the photophysical origin of the unexpected optoelectronic properties of these materials.
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Affiliation(s)
- Franco V A Camargo
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza L. da Vinci 32 , 20133 Milano , Italy
| | - Tetsuhiko Nagahara
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza L. da Vinci 32 , 20133 Milano , Italy.,Department of Chemistry and Materials Technology , Kyoto Institute of Technology , 606-8585 Kyoto , Japan
| | - Sascha Feldmann
- Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Johannes M Richter
- Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Richard H Friend
- Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Giulio Cerullo
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza L. da Vinci 32 , 20133 Milano , Italy
| | - Felix Deschler
- Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom.,Walter Schottky Institut and Physik Department , Technische Universität München , 85748 Garching , Germany
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27
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Abstract
Lead halide perovskite nanocrystals (NCs) have been widely studied for application in optoelectronic devices due to their excellent optical properties and low-cost synthesis. However, the toxicity of lead and the poor stability of the NCs hindered their practical applications. Sn2+-based perovskite with low toxicity was first developed; however, the Sn2+-based perovskite NCs are unstable in air and oxidize easily. Recently, air-stable lead-free perovskite NCs have been developed and received increasing attention. Unfortunately, the optical and optoelectronic properties of these lead-free halide perovskite NCs are generally far worse than those of lead-perovskite NCs. Understanding the charge-carrier dynamics of semiconductors is crucial to improve their optical properties. In this Account, we mainly review our recent research progress on the study of charge-carrier dynamics in air-stable lead-free perovskite NCs. The exciton trapping followed by nonradiative recombination was the major carrier relaxation pathway and resulted in a low photoluminescence quantum efficiency (PLQE). A feasible route for passivating surface traps and tuning the self-trapped excitons from "dark" (nonradiative) to "bright" (radiative) was proposed. Through this strategy, the PLQE could be increased over 100-fold. In addition, we have compared several photophysical properties of lead-free perovskite NCs with that of lead perovskite NCs, such as charge-carrier relaxation, exciton-phonon coupling, and hot-carrier cooling. In 2017, we reported the synthesis, optical properties, and charge-carrier dynamics of Cs3Bi2X9 (X: Cl, Br, I) NCs. The Cs3Bi2Br9 NCs exhibited clear exciton trapping processes with time scales in the range of 2-20 ps. The fast trapping processes could be passivated via the use of surfactants (such as oleic acid), and the PLQE increased over 20-fold (from 0.2% to 4.5%). The low PLQE may be due to the reduced dimensionality of Cs3Bi2Br9 (2D) compared with the 3D cubic perovskite structure of CsPbBr3. We next reported double perovskite Cs2AgSb1-yBiyX6 (X: Br, Cl; 0 ≤ y ≤ 1) NCs, which exhibited a similar 3D cubic perovskite structure to that of the lead-perovskite NCs. The charge-carrier dynamics indicated that the sub-band-gap exciton trapping processes were dominated by ultrafast (∼1-2 ps) intrinsic self-trapping and trapping at surface defects (∼50-100 ps). While trapping at surface defects can be passivated using surfactants, the self-trapping processes is due to the giant carrier-phonon coupling effect. By designing direct band gap double perovskite NCs to tune the sub-band-gap trapping processes, bright dual-color emission was achieved. Furthermore, the violet PLQE could be improved to 36.6%, which is comparable to that in lead halide perovskite NCs. We hope this Account will deepen the understanding of the charge-carrier dynamics in lead-free perovskite NCs and guide the design of high-performance lead-free perovskites.
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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
| | - 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, 266237, P. R. China
- University of the Chinese Academy of sciences, Beijing 100049, P. R. China
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28
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Liu L, Zhao R, Xiao C, Zhang F, Pevere F, Shi K, Huang H, Zhong H, Sychugov I. Size-Dependent Phase Transition in Perovskite Nanocrystals. J Phys Chem Lett 2019; 10:5451-5457. [PMID: 31465691 DOI: 10.1021/acs.jpclett.9b02058] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The complex structure of halide and oxide perovskites strongly affects their physical properties. Here, the effect of dimensions reduced to the nanoscale has been investigated by a combination of single-dot optical experiments with a phase transition theory. Methylammonium lead bromide (CH3NH3PbBr3) nanocrystals with two average particle sizes of ∼2 and ∼4 nm with blue and green photoluminescence, respectively, were spectrally and temporally probed on a single-particle level from 5 to 295 K. The results show that the abrupt blue shift of the photoluminescence spectra and lifetimes at ∼150 K can be attributed to the cubic-to-tetragonal phase transition in the large 4 nm nanocrystals, while this phase transition is completely absent for the small 2 nm particles in the investigated temperature range. Theoretical calculations based on Landau theory reveal a strong size-dependent effect on temperature-induced phase transitions in individual CH3NH3PbBr3 nanocrystals, corroborating experimental observations. This effect should be considered in structure-property analysis of ultrasmall perovskite crystals.
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Affiliation(s)
- Lige Liu
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, School of Physics , Peking University , Beijing 100871 , China
- Department of Applied Physics , KTH Royal Institute of Technology , Electrum 229 , 16440 Kista , Sweden
| | - Ru Zhao
- School of Materials Science & Engineering , Beijing Institute of Technology , 5 South Street of Zhongguancun , 100081 Beijing , China
- Advanced Research Institute of Multidisciplinary Science , Beijing Institute of Technology , 5 South Street of Zhongguancun , 100081 Beijing , China
| | - Changtao Xiao
- School of Materials Science & Engineering , Beijing Institute of Technology , 5 South Street of Zhongguancun , 100081 Beijing , China
| | - Feng Zhang
- School of Materials Science & Engineering , Beijing Institute of Technology , 5 South Street of Zhongguancun , 100081 Beijing , China
| | - Federico Pevere
- Department of Applied Physics , KTH Royal Institute of Technology , Electrum 229 , 16440 Kista , Sweden
| | - Kebin Shi
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, School of Physics , Peking University , Beijing 100871 , China
| | - Houbing Huang
- School of Materials Science & Engineering , Beijing Institute of Technology , 5 South Street of Zhongguancun , 100081 Beijing , China
- Advanced Research Institute of Multidisciplinary Science , Beijing Institute of Technology , 5 South Street of Zhongguancun , 100081 Beijing , China
| | - Haizheng Zhong
- School of Materials Science & Engineering , Beijing Institute of Technology , 5 South Street of Zhongguancun , 100081 Beijing , China
| | - Ilya Sychugov
- Department of Applied Physics , KTH Royal Institute of Technology , Electrum 229 , 16440 Kista , Sweden
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29
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Chen J, Messing ME, Zheng K, Pullerits T. Cation-Dependent Hot Carrier Cooling in Halide Perovskite Nanocrystals. J Am Chem Soc 2019; 141:3532-3540. [DOI: 10.1021/jacs.8b11867] [Citation(s) in RCA: 130] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Junsheng Chen
- Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Maria E. Messing
- Solid State Physics and NanoLund, Lund University, Box 118, 22100 Lund, Sweden
| | - Kaibo Zheng
- Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
- Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - Tonu Pullerits
- Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
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30
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Yang B, Hong F, Chen J, Tang Y, Yang L, Sang Y, Xia X, Guo J, He H, Yang S, Deng W, Han K. Colloidal Synthesis and Charge-Carrier Dynamics of Cs2
AgSb1−y
Bi
y
X6
(X: Br, Cl; 0 ≤y
≤1) Double Perovskite Nanocrystals. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201811610] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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
| | - 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
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Yuxuan Tang
- 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
| | - Li 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
| | - Youbao Sang
- University of the Chinese Academy of sciences; Beijing 100039 P. R. China
- Key Laboratory of Chemical Lasers; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Xusheng Xia
- University of the Chinese Academy of sciences; Beijing 100039 P. R. China
- Key Laboratory of Chemical Lasers; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Jingwei Guo
- Key Laboratory of Chemical Lasers; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - Haixiang He
- School of Chemistry & Chemical Engineering; Guangxi University; Nanning 530004 China
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics; Dalian Institute of Chemical Physics; Chinese Academy of Science; Dalian 116023 P. R. China
| | - 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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31
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Yang B, Hong F, Chen J, Tang Y, Yang L, Sang Y, Xia X, Guo J, He H, Yang S, Deng W, Han K. Colloidal Synthesis and Charge-Carrier Dynamics of Cs 2 AgSb 1-y Bi y X 6 (X: Br, Cl; 0 ≤y ≤1) Double Perovskite Nanocrystals. Angew Chem Int Ed Engl 2019; 58:2278-2283. [PMID: 30576043 DOI: 10.1002/anie.201811610] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Indexed: 11/11/2022]
Abstract
A series of lead-free double perovskite nanocrystals (NCs) Cs2 AgSb1-y Biy X6 (X: Br, Cl; 0≤y≤1) is synthesized. In particular, the Cs2 AgSbBr6 NCs is a new double perovskite material that has not been reported for the bulk form. Mixed Ag-Sb/Bi NCs exhibit enhanced stability in colloidal solution compared to Ag-Bi or Ag-Sb NCs. Femtosecond transient absorption studies indicate the presence of two prominent fast trapping processes in the charge-carrier relaxation. The two fast trapping processes are dominated by intrinsic self-trapping (ca. 1-2 ps) arising from giant exciton-phonon coupling and surface-defect trapping (ca. 50-100 ps). Slow hot-carrier relaxation is observed at high pump fluence, and the possible mechanisms for the slow hot-carrier relaxation are also discussed.
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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
| | - 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
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, P. R. China
| | - Yuxuan Tang
- 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
| | - Li 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
| | - Youbao Sang
- University of the Chinese Academy of sciences, Beijing, 100039, P. R. China.,Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, P. R. China
| | - Xusheng Xia
- University of the Chinese Academy of sciences, Beijing, 100039, P. R. China.,Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, P. R. China
| | - Jingwei Guo
- Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, P. R. China
| | - Haixiang He
- School of Chemistry & Chemical Engineering, Guangxi University, Nanning, 530004, China
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, P. R. China
| | - 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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