1
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Lv J, Liu A, Shi D, Li M, Liu X, Wan Y. Hot Carrier Trapping and It's Influence to the Carrier Diffusion in CsPbBr 3 Perovskite Film Revealed by Transient Absorption Microscopy. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2403507. [PMID: 38733084 DOI: 10.1002/advs.202403507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Indexed: 05/13/2024]
Abstract
The defects in perovskite film can cause charge carrier trapping which shortens carrier lifetime and diffusion length. So defects passivation has become promising for the perovskite studies. However, how defects disturb the carrier transport and how the passivating affects the carrier transport in CsPbBr3 are still unclear. Here the carrier dynamics and diffusion processes of CsPbBr3 and LiBr passivated CsPbBr3 films are investigated by using transient absorption spectroscopy and transient absorption microscopy. It's found that there is a fast hot carrier trapping process with the above bandgap excitation, and the hot carrier trapping would decrease the population of cold carriers which are diffusible, then lower the carrier diffusion constant. It's proved that LiBr can passivate the defect and lower the trapping probability of hot carriers, thus improve the carrier diffusion rate. The finding demonstrates the influence of hot carrier trapping to the carrier diffusion in CsPbBr3 film.
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Affiliation(s)
- Jianchang Lv
- College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Ao Liu
- College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Danli Shi
- College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Minjie Li
- College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Xi Liu
- College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Yan Wan
- College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
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2
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Guo Y, Fang L, Li Q, Bai X, Xue Y, Lai C, Wang Y. Insight into the interface engineering between methylammonium lead halide perovskites and gallium oxide: a first-principles approach. Phys Chem Chem Phys 2023; 25:31804-31812. [PMID: 37966055 DOI: 10.1039/d3cp04090a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
Interface engineering of the organo-lead halide perovskite devices has shown the potential to improve their efficiency and stability. In this study, the atomic, electronic, optical and transport characteristics of MAPbI3/Ga2O3 and MAPbCl3/Ga2O3 interfaces were investigated by using first-principles calculations. Eight different interfacial models were established and the interfacial properties were discussed. The results show that the PbI/O configuration exhibits the largest bonding strength out of all eight interfacial configurations. Owing to the larger interfacial interaction, the charge transfer at the PbI/O interface is significantly more than that at the other interfaces. The analysis of absorption spectra indicates that the Ga-terminated perovskite/Ga2O3 heterostructures are expected to have great potential for efficient optoelectronic applications. The analysis of transmission spectra shows that the MA/O configurations with more transmission peaks near the Fermi level exhibit lower resistance compared to others. The results of our study could help understand the interfacial engineering mechanism between perovskite and Ga2O3.
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Affiliation(s)
- Yao Guo
- School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China.
| | - Liuru Fang
- School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China.
- Hubei province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Qiang Li
- Department of Physics, Hubei Minzu University, Enshi 445000, China
| | - Xiaojing Bai
- School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China.
| | - Yuanbin Xue
- School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China.
| | - Changwei Lai
- School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China.
| | - Yuhua Wang
- Hubei province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081, China.
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3
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Tian X, Fang Q, Long R, Fang WH. Great Influence of Pressure and Isotope Effects on Nonradiative Charge Loss in Hybrid Organic-Inorganic Perovskites. J Phys Chem Lett 2023; 14:7134-7140. [PMID: 37534991 DOI: 10.1021/acs.jpclett.3c01776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
The intrinsic softness of hybrid organic-inorganic perovskites (HOIPs) allows their lattice and optoelectronic performance to be tunable to external pressure. Using nonadiabatic (NA) molecular dynamics, we demonstrate that a mild pressure accelerates hot electron relaxation and suppresses nonradiative electron-hole recombination in CH3NH3PbI3. Both processes are governed by NA coupling, which is enhanced between the electronic states of the quasi-continuous bands while is decreased between the band-edge states by reducing the electron-hole wave function overlap. Hydrogen/deuterium isotope exchange alleviates the pressure-induced NA coupling by increasing lattice rigidity and decreasing wave function overlap, slowing down both the hot electron relaxation and electron-hole recombination processes. The simulated time scales of sub-3 ps for hot electron relaxation and half nanoseconds for recombination agree well with the experiments. The study suggests that the isotope exchange can mitigate the pressure-caused fast losses of hot electrons and further prolong the charge carrier lifetime in HOIPs.
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Affiliation(s)
- Xuesong Tian
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P. R. China
| | - Qiu Fang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P. R. China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P. R. China
| | - Wei-Hai Fang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P. R. China
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4
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Zhao X, Vasenko AS, Prezhdo OV, Long R. Anion Doping Delays Nonradiative Electron-Hole Recombination in Cs-Based All-Inorganic Perovskites: Time Domain ab Initio Analysis. J Phys Chem Lett 2022; 13:11375-11382. [PMID: 36454707 DOI: 10.1021/acs.jpclett.2c03072] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Using time-domain density functional theory combined with nonadiabatic (NA) molecular dynamics, we demonstrate that composition engineering of the X-site anions has a strong influence on the nonradiative electron-hole recombination and thermodynamic stability of cesium-based all-inorganic perovskites. Partial substitution of iodine(I) with bromine (Br) and acetate (Ac) anions reduces the NA electron-vibrational coupling by minimizing the overlap between the electron and hole wave functions and suppressing atomic fluctuations. The doping also widens the energy gap to further reduce the NA coupling and to enhance the open-circuit voltage of perovskite solar cells. These factors increase the charge carrier lifetime by an order of magnitude and improve structural stability in the series CsPbI1.88BrAc0.12 > CsPbI2Br > CsPbI3. The fundamental atomistic insights into the influence of anion doping on the photophysical properties of the all-inorganic lead halide perovskites guide the design of efficient optoelectronic materials.
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Affiliation(s)
- Xi Zhao
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing100875, People's Republic of China
| | - Andrey S Vasenko
- HSE University, 101000Moscow, Russia
- I. E. Tamm Department of Theoretical Physics, P. N. Lebedev Physical Institute, Russian Academy of Sciences, 119991Moscow, Russia
| | - Oleg V Prezhdo
- Departments of Chemistry, and Physics and Astronomy, University of Southern California, Los Angeles, California90089, United States
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing100875, People's Republic of China
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5
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Liu Y, Long R, Fang WH. Great Influence of Organic Cation Motion on Charge Carrier Dynamics in Metal Halide Perovskite Unraveled by Unsupervised Machine Learning. J Phys Chem Lett 2022; 13:8537-8545. [PMID: 36067083 DOI: 10.1021/acs.jpclett.2c02515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Unsupervised machine learning combined with time-dependent density functional theory reveals the significant influence of organic cation on the charge carrier lifetime of FAPbI3 (FA = HC(NH2)2+) by analyzing their mutual information (MI) between the geometric features and the nonadiabatic coupling (NAC) and bandgap. Analysis of MI values demonstrates that the NAC and bandgap are dominated by the orientation and shape of the inorganic octahedron because iodine and lead atoms are composed of the band edge states. Counterintuitively, the correlated motion promotes the contribution of the FA cation to the NAC; in particular, one type of FA rotation even supersedes the influence of the velocities of the lead and iodine atoms due to the enhanced hydrogen bond interaction. Our study demonstrates the importance of the correlated motion on the excited-state lifetimes of FAPbI3, which provides a guidance for optimizing the optoelectronic properties of metal halide perovskites.
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Affiliation(s)
- Yulong Liu
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Wei-Hai Fang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, People's Republic of China
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6
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Ščajev P, Mekys A, Subačius L, Stanionytė S, Kuciauskas D, Lynn KG, Swain SK. Impact of dopant-induced band tails on optical spectra, charge carrier transport, and dynamics in single-crystal CdTe. Sci Rep 2022; 12:12851. [PMID: 35896581 PMCID: PMC9329450 DOI: 10.1038/s41598-022-16994-7] [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: 04/12/2022] [Accepted: 07/19/2022] [Indexed: 11/09/2022] Open
Abstract
Cadmium telluride (CdTe) semiconductors are used in thin-film photovoltaics, detectors, and other optoelectronic applications. For all technologies, higher efficiency and sensitivity are achieved with reduced charge carrier recombination. In this study, we use state-of-the-art CdTe single crystals and electro-optical measurements to develop a detailed understanding of recombination rate dependence on excitation and temperature in CdTe. We study recombination and carrier dynamics in high-resistivity (undoped) and arsenic (As)-doped CdTe by employing absorption, the Hall effect, time-resolved photoluminescence, and pump-probe in the 80-600 K temperature range. We report extraordinarily long lifetimes (30 µs) at low temperatures in bulk undoped CdTe. Temperature dependencies of carrier density and mobility reveal ionization of the main acceptors and donors as well as dominant scattering by ionized impurities. We also distinguish different recombination defects. In particular, shallow AsTe and deep VCd-AsCd acceptors were responsible for p-type conductivity. AX donors were responsible for electron capture, while nonradiative recombination centers (VCd-AsTe, As2 precipitates), and native defects (VCd-TeCd) were found to be dominant in p-type and n-type CdTe, respectively. Bimolecular and surface recombination rate temperature dependencies were also revealed, with bimolecular coefficient T-3/2 temperature dependence and 170 meV effective surface barrier, leading to an increase in surface recombination velocity at high temperatures and excitations. The results of this study allowed us to conclude that enhanced crucible rotation growth of As-doped CdTe is advantageous to As activation, leading to longer lifetimes and larger mobilities and open-circuit voltages due to lower absorption and trapping.
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Affiliation(s)
- Patrik Ščajev
- Institute of Photonics and Nanotechnology, Faculty of Physics, Vilnius University, Saulėtekio Ave. 3, 10257, Vilnius, Lithuania.
| | - Algirdas Mekys
- Institute of Photonics and Nanotechnology, Faculty of Physics, Vilnius University, Saulėtekio Ave. 3, 10257, Vilnius, Lithuania
| | - Liudvikas Subačius
- Optoelectronics Department, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257, Vilnius, Lithuania
| | - Sandra Stanionytė
- Optoelectronics Department, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257, Vilnius, Lithuania
| | - Darius Kuciauskas
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Kelvin G Lynn
- Center for Materials Research, Washington State University, Pullman, WA, 99164, USA
| | - Santosh K Swain
- Center for Materials Research, Washington State University, Pullman, WA, 99164, USA
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7
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Ašmontas S, Čerškus A, Gradauskas J, Grigucevičienė A, Juškėnas R, Leinartas K, Lučun A, Petrauskas K, Selskis A, Staišiūnas L, Sužiedėlis A, Šilėnas A, Širmulis E. Photoelectric Properties of Planar and Mesoporous Structured Perovskite Solar Cells. MATERIALS 2022; 15:ma15124300. [PMID: 35744358 PMCID: PMC9230565 DOI: 10.3390/ma15124300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 06/13/2022] [Accepted: 06/16/2022] [Indexed: 01/28/2023]
Abstract
The high efficiency of perovskite solar cells strongly depends on the quality of perovskite films and carrier extraction layers. Here, we present the results of an investigation of the photoelectric properties of solar cells based on perovskite films grown on compact and mesoporous titanium dioxide layers. Kinetics of charge carrier transport and their extraction in triple-cation perovskite solar cells were studied by using transient photovoltage and time-resolved photoluminescence decay measurements. X-ray diffraction analysis revealed that the crystallinity of the perovskite films grown on mesoporous titanium dioxide is better compared to the films grown on compact TiO2. Mesoporous structured perovskite solar cells are found to have higher power conversion efficiency mainly due to enlarged perovskite/mesoporous -TiO2 interfacial area and better crystallinity of their perovskite films.
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8
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Dai D, Shi R, Long R. Improving Lattice Rigidity and Charge Carrier Lifetime by Engineering Spacer Cation of Ruddlesden-Popper Perovskites: A Time-Domain Ab Initio Study. J Phys Chem Lett 2022; 13:2718-2724. [PMID: 35311293 DOI: 10.1021/acs.jpclett.2c00085] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
First-principles quantum dynamics calculations show that charge carrier lifetimes, charge transport, and lattice stability are notably improved when BA (CH3(CH2)3NH3+) in BA2PbI4 is replaced with MTEA (CH3(CH2)2SNH3+). By suppressing atomic fluctuations, MTEA enhances the lattice stiffness and inhibits loss of coherence due to the S-S interaction. By delocalizing hole wave functions on the MTEA, particularly on the S atoms, while maintaining the electron wave functions largely unchanged compared to the BA2PbI4, MTEA serves to enhance charge transport and NA coupling while narrowing the bandgap by 0.18 eV. Overall, MTEA decreases NA coupling due to slow atomic motions against a large overlap of electron-hole wave functions, which suppresses nonradiative electron-hole recombination and prolongs carrier lifetime twice longer compared with BA2PbI4. This simulation presents a rational route to make high performance two-dimensional perovskite solar cells.
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Affiliation(s)
- Dandan Dai
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing, 100875, People's Republic of China
| | - Ran Shi
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing, 100875, People's Republic of China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing, 100875, People's Republic of China
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9
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Chapman A, Ertekin E, Kubota M, Nagao A, Bertsch K, Macadre A, Tsuchiyama T, Masamura T, Takaki S, Komoda R, Dadfarnia M, Somerday B, Staykov AT, Sugimura J, Sawae Y, Morita T, Tanaka H, Yagi K, Niste V, Saravanan P, Onitsuka S, Yoon KS, Ogo S, Matsushima T, Tumen-Ulzii G, Klotz D, Nguyen DH, Harrington G, Adachi C, Matsumoto H, Kwati L, Takahashi Y, Kosem N, Ishihara T, Yamauchi M, Saha BB, Islam MA, Miyawaki J, Sivasankaran H, Kohno M, Fujikawa S, Selyanchyn R, Tsuji T, Higashi Y, Kirchheim R, Sofronis P. Achieving a Carbon Neutral Future through Advanced Functional Materials and Technologies. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210323] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Andrew Chapman
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Elif Ertekin
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Illinois, USA
| | - Masanobu Kubota
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Akihide Nagao
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Kaila Bertsch
- Lawrence Livermore National Laboratory, California, USA
| | - Arnaud Macadre
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Yamaguchi University, Yamaguchi, Japan
| | - Toshihiro Tsuchiyama
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Materials Science and Engineering, Kyushu University, Fukuoka, Japan
| | - Takuro Masamura
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Materials Science and Engineering, Kyushu University, Fukuoka, Japan
| | - Setsuo Takaki
- Netsuren Co., Ltd., Hyogo, Japan
- Emeritus Professor, Kyushu University, Fukuoka, Japan
| | - Ryosuke Komoda
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
| | - Mohsen Dadfarnia
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Seattle University, Washington, USA
| | - Brian Somerday
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Illinois, USA
- Somerday Consulting LLC, Pennsylvania, USA
| | - Alexander Tsekov Staykov
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Joichi Sugimura
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Research Center for Hydrogen Industrial Use and Storage, Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
| | - Yoshinori Sawae
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
| | - Takehiro Morita
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
| | - Hiroyoshi Tanaka
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Research Center for Hydrogen Industrial Use and Storage, Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
| | - Kazuyuki Yagi
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Research Center for Hydrogen Industrial Use and Storage, Kyushu University, Fukuoka, Japan
- Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
| | | | - Prabakaran Saravanan
- Department of Mechanical Engineering, Birla Institute of Technology & Science - Pilani, Hyderabad, Telangana, India
| | - Shugo Onitsuka
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Ki-Seok Yoon
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Seiji Ogo
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Toshinori Matsushima
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Ganbaatar Tumen-Ulzii
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Dino Klotz
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Dinh Hoa Nguyen
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - George Harrington
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Chihaya Adachi
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Hiroshige Matsumoto
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Leonard Kwati
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Yukina Takahashi
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Nuttavut Kosem
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Tatsumi Ishihara
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Miho Yamauchi
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Bidyut Baran Saha
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Md. Amirul Islam
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Jin Miyawaki
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Harish Sivasankaran
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Masamichi Kohno
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Shigenori Fujikawa
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Roman Selyanchyn
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Takeshi Tsuji
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Yukihiro Higashi
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
| | - Reiner Kirchheim
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Institute of Materials Physics, University of Gottingen, Germany
| | - Petros Sofronis
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Illinois, USA
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10
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Zhao X, Long R. Benign Effects of Twin Boundaries on Charge Carrier Lifetime in Metal Halide Perovskites by a Time-Domain Study. J Phys Chem Lett 2021; 12:8575-8582. [PMID: 34468158 DOI: 10.1021/acs.jpclett.1c02653] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Experiments show that two-dimensional twin boundaries (TBs) defects are benign to the excited-state lifetime of metal halide perovskites and solar cells performance. However, the mechanism remains unclear. By performing nonadiabatic (NA) molecular dynamics simulations on FAPbI3 (FA= HC(NH2)2+), we demonstrate that TBs increase the bandgap without introducing midgap states, promote charge separation by localizing electrons and holes that reduce NA coupling and accelerate the loss of coherence, slowing nonradiative electron-hole recombination by a factor of 2.3 compared to pristine FAPbI3, which occurs within sub-10 ns and agrees well with the experiment. Raising the temperature shortens the coherence time and reduces the NA coupling by increasing the charge localization due to the enhanced distortions of inorganic Pb-I lattice, making the recombination even slower. Our study rationalizes the positive influence of TBs and temperature on perovskite charge dynamics and emphasizes the roles played by the charge localization and quantum coherence.
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Affiliation(s)
- Xi Zhao
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing, 100875, People's Republic of China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing, 100875, People's Republic of China
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11
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Zhao X, Long R. Isotopic Exchange Extends Charge Carrier Lifetime in Metal Lead Perovskites by Quantum Dynamics Simulations. J Phys Chem Lett 2020; 11:10298-10305. [PMID: 33227211 DOI: 10.1021/acs.jpclett.0c03289] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
One may expect that isotopic exchange has no influence on charge carrier lifetime and perovskite solar cell performance because isotopic effects do not affect the fundamental electronic structure of materials. Experiments defy this expectation. By performing nonadiabatic (NA) molecular dynamics simulations, we demonstrate that hydrogen and deuterium exchange significantly enhances the excited-state lifetime and stability of CH3NH3PbI3. Replacing lighter hydrogen with heavier deuterium suppresses the collective motions of organic and inorganic components, thus enhancing lattice stiffness and decreasing the NA coupling. Isotopic exchange further reduces NA coupling by localizing electron wave functions for separation of electrons and holes, which beats the extended coherence time, slowing down nonradiative electron-hole recombination from CH3ND3PbI3 to CD3ND3PbI3 with respect to the pristine system. The unchanged fundamental electronic structure together with the prolonged carrier lifetime and enhanced stability rationalize the improvement of the deuterated CH3NH3PbI3 solar cells. Our work provides valuable insights into isotope effects for the design of high-performance perovskite photovoltaic and optoelectronic devices.
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Affiliation(s)
- Xi Zhao
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, People's Republic of China
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12
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Qiao L, Fang WH, Long R, Prezhdo OV. Photoinduced Dynamics of Charge Carriers in Metal Halide Perovskites from an Atomistic Perspective. J Phys Chem Lett 2020; 11:7066-7082. [PMID: 32787332 DOI: 10.1021/acs.jpclett.0c01687] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Perovskite solar cells have attracted intense attention over the past decade because of their low cost, abundant raw materials, and rapidly growing power conversion efficiency (PCE). However, nonradiative charge carrier losses still constitute a major factor limiting the PCE to well below the Shockley-Queisser limit. This Perspective summarizes recent atomistic quantum dynamics studies on the photoinduced excited-state processes in metal halide perovskites (MHPs), including both hybrid organic-inorganic and all-inorganic MHPs and three- and two-dimensional MHPs. The simulations, performed using a combination of time-domain ab initio density functional theory and nonadiabatic molecular dynamics, allow emphasis on various intrinsic and extrinsic features, such as components, structure, dimensionality and interface engineering, control and exposure to various environmental factors, defects, surfaces, and their passivation. The detailed atomistic simulations advance our understanding of electron-vibrational dynamics in MHPs and provide valuable guidelines for enhancing the performance of perovskite solar cells.
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Affiliation(s)
- Lu Qiao
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P.R. China
| | - Wei-Hai Fang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P.R. China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P.R. China
| | - Oleg V Prezhdo
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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Wang Y, Long R. Rapid Decoherence Induced by Light Expansion Suppresses Charge Recombination in Mixed Cation Perovskites: Time-Domain ab Initio Analysis. J Phys Chem Lett 2020; 11:1601-1608. [PMID: 32017852 DOI: 10.1021/acs.jpclett.0c00139] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Using time-domain density functional theory combined with nonadiabatic molecular dynamics, we have investigated the effect of light-induced lattice expansion on the nonradiative electron-hole recombination in the mixed-cation perovskite FA0.75MA0.25PbI3. We demonstrate that charge carrier lifetime extends by a factor of 1.5 within 1% lattice expansion; the bandgap grows only by 0.04 eV; the electron-phonon coupling increases by 13%; and the decoherence time shortens by 37%. The small bandgap change has negligible influence on recombination times. Lattice expansion enhances atomic fluctuations that lead to the enhancement of electron-phonon coupling and acceleration of decoherence. By creating several high-frequency phonon modes, the lattice expansion shortens the decoherence time further. As a result, rapid decoherence beats an enhanced electron-phonon coupling, playing the dominant role in suppressing the nonradiative electron-hole recombination. The light-induced lattice expansion or strain effects provide a rational route to improve the perovskite photovoltaic and photoelectronic device performance.
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Affiliation(s)
- Yutong Wang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing 100875 , P. R. China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing 100875 , P. R. China
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Jiang Y, Wang X, Pan A. Properties of Excitons and Photogenerated Charge Carriers in Metal Halide Perovskites. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806671. [PMID: 31106917 DOI: 10.1002/adma.201806671] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 03/01/2019] [Indexed: 05/25/2023]
Abstract
Metal halide perovskites (MHPs) have recently attracted great attention from the scientific community due to their excellent photovoltaic performance as well as their tremendous potential for other optoelectronic applications such as light-emitting diodes, lasers, and photodetectors. Despite the rapid progress in device applications, a solid understanding of the photophysical properties behind the device performance is highly desirable for MHPs. Here, the properties of excitons and photogenerated charge carriers in MHPs are explored. The unique dielectric constant properties, crystal-liquid duality, and fundamental optical processes of MHPs are first discussed. The properties of excitons and related phenomena in MHPs are then detailed, including the exciton binding energy determined by various methods and their influence factors, exciton dynamics, exciton-photon coupling and related applications, and exciton-phonon coupling in MHPs. The properties of photogenerated free charge carriers in MHPs such as the carrier diffusion length, mobility, and recombination are described. Recent progress in various applications is also demonstrated. Finally, a conclusion and perspectives of future studies for MHPs are presented.
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Affiliation(s)
- Ying Jiang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronics, Hunan University, Changsha, 410012, China
| | - Xiao Wang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronics, Hunan University, Changsha, 410012, China
| | - Anlian Pan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials Science and Engineering, Hunan University, Changsha, 410012, China
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Qiao L, Long R, Fang WH. Surface Pb-Dimer Passivated by Molecule Oxygen Notably Suppresses Charge Recombination in CsPbBr 3 Perovskites: Time-Domain Ab Initio Analysis. J Phys Chem Lett 2019; 10:5499-5506. [PMID: 31475525 DOI: 10.1021/acs.jpclett.9b02201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Experiments show that excess lead atoms accelerate charge recombination while oxygen passivation can heal the defects and enhance solar cell efficiency. Using ab initio nonadiabatic (NA) molecular dynamics, we demonstrate that an excess lead atom forms a Pb-dimer with a single surface lead atom of CsPbBr3(001) surface and creates a deep hole trap. The electron-hole recombination is accelerated to over 10 ps via fast hole trapping or bypassing the hole trap compared to the pristine CsPbBr3, occurring on tens of picoseconds. Pb-dimer passivated with oxygen molecules forms Pb-O bonds, breaks the Pb-dimer, and removes the trap state, leading to a decrease in the recombination and extending excited-state lifetime to over 100 ps. The deceleration arises mainly due to the reduced NA coupling and short decoherence time. The study advances our understanding of excited-state dynamics of all-inorganic perovskites in the presence of excess lead and oxygen atmosphere.
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Affiliation(s)
- Lu Qiao
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing , 100875 , People's Republic of China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing , 100875 , People's Republic of China
| | - Wei-Hai Fang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing , 100875 , People's Republic of China
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Ščajev P, Litvinas D, Kreiza G, Stanionytė S, Malinauskas T, Tomašiūnas R, Juršėnas S. Highly efficient nanocrystalline Cs xMA 1-xPbBr x perovskite layers for white light generation. NANOTECHNOLOGY 2019; 30:345702. [PMID: 30995629 DOI: 10.1088/1361-6528/ab1a69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Perovskite light converting layers optimization for cost-efficient white light emitting diodes (LED) was demonstrated. High excitation independent internal quantum efficiency (IQE) of 80% and weakly excitation dependent PL spectra suitable for white light generation were obtained in the mixed cation CsxMA1-xPbBr3 perovskite nanocrystal layers with optimal x = 0.3 being determined by effective surface passivation and phase mixing as revealed by x-ray diffraction. Enhancement of the PL homogeneity and the external quantum efficiency (EQE) were secured when using 2,2',2″-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole (TPBi) additive in the layer preparation process. Excitation dependent PL intensity, decay time, and IQE revealed that the high emission efficiency of the layers originates from a dominant radiative localized exciton recombination (130 ns) weakly influenced by the nonradiative free carrier recombination (750 ns). Warm and cool white LEDs with correlated color temperature 3000 K and 5600 K, and color rendering index 82 and 74, respectively, were realized by using the optimized perovskite layers, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) red emitter and a blue LED.
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Affiliation(s)
- Patrik Ščajev
- Institute of Photonics and Nanotechnology, Vilnius University, Sauletekio ave. 3, LT 10257, Vilnius, Lithuania
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Wang Y, Long R. Unravelling the Effects of Pressure-Induced Suppressed Electron-Hole Recombination in CsPbBr 3 Perovskite: Time-Domain ab Initio Analysis. J Phys Chem Lett 2019; 10:4354-4361. [PMID: 31317740 DOI: 10.1021/acs.jpclett.9b01678] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Using nonadiabatic (NA) molecular dynamics simulations, we demonstrate pressure-dependent electron-hole recombination in all-inorganic CsPbBr3 perovskite. In particular, electron-hole recombination under 1 atm takes place in several hundred picoseconds, agreeing well with experiments. An increase of pressure causes PbBr6 octahedron distortion, including contraction of both Pb-Br-Pb angles and Pb-Br bond lengths, leading to a decrease in decoherence time and NA coupling and thus slowing electron-hole recombination. When the pressure reaches a critical pressure of 1.20 GPa, a phase transition occurs in which the charge carrier lifetime is longest and extends to several nanoseconds. When the pressure is increased over the threshold, the shrinkage of Pb-Br bond length is inhibited and the contraction of Pb-Br-Pb angles primarily induced the PbBr6 octahedron distortion. Such a situation gives rise to a mild NA coupling and decoherence time, restoring the recombination time to over half of a nanosecond. Our study uncovers the mechanisms for the pressure-suppressed charge recombination and provides an advanced route toward further development of photovoltaic performance of perovskite materials.
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Affiliation(s)
- Yutong Wang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing , 100875 , P.R. China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing , 100875 , P.R. China
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Wang Y, Fang WH, Long R, Prezhdo OV. Symmetry Breaking at MAPbI 3 Perovskite Grain Boundaries Suppresses Charge Recombination: Time-Domain ab Initio Analysis. J Phys Chem Lett 2019; 10:1617-1623. [PMID: 30892907 DOI: 10.1021/acs.jpclett.9b00763] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The influence of grain boundaries (GBs) on charge carrier lifetimes in methylammonium lead triiodide perovskite (MAPbI3) remains unclear. Some experiments suggest that GBs promote rapid nonradiative decay and deteriorate device performance, while other measurements indicate that charge recombination happens primarily in non-GB regions and that GBs facilitate charge separation and collection. By combining time-domain density functional theory and nonadiabatic (NA) molecular dynamics, we demonstrate that charge separation and localization happening at MAPbI3 GBs due to symmetry breaking suppresses charge recombination. Even though GBs lower the MAPbI3 bandgap and charge localization enhances interactions with phonons, electron-hole separation decreases the NA coupling, and the excited state lifetime remains virtually unchanged compared to the pristine perovskite. Our study rationalizes how GBs can have a positive influence on perovskite optoelectronic properties and advances fundamental understanding of charge carrier dynamics in these fascinating materials.
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Affiliation(s)
- Yutong Wang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing 100875 , P. R. China
| | - Wei-Hai Fang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing 100875 , P. R. China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education , Beijing Normal University , Beijing 100875 , P. R. China
| | - Oleg V Prezhdo
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
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Arias DH, Moore DT, van de Lagemaat J, Johnson JC. Direct Measurements of Carrier Transport in Polycrystalline Methylammonium Lead Iodide Perovskite Films with Transient Grating Spectroscopy. J Phys Chem Lett 2018; 9:5710-5717. [PMID: 30204448 DOI: 10.1021/acs.jpclett.8b02245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hybrid organic-inorganic halide perovskites have been proposed in many optoelectronic applications, but critical to their increasing functionality and utility is understanding and controlling carrier transport. Here, we use light-induced transient grating spectroscopy to probe directly carrier transport in polycrystalline methylammonium lead iodide perovskite thin films using a weakly perturbative and noncontact method. The data reveal intrinsic diffusion characteristics of the charge carriers in the material and agree well with a simulated model of charge transport in which grain boundaries act as barriers to carrier movement.
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Affiliation(s)
- Dylan H Arias
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
| | - David T Moore
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
| | - Jao van de Lagemaat
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
| | - Justin C Johnson
- National Renewable Energy Laboratory , 15013 Denver West Parkway , Golden , Colorado 80401 , United States
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El Ajjouri Y, Chirvony VS, Sessolo M, Palazon F, Bolink HJ. Incorporation of potassium halides in the mechanosynthesis of inorganic perovskites: feasibility and limitations of ion-replacement and trap passivation. RSC Adv 2018; 8:41548-41551. [PMID: 35559307 PMCID: PMC9091861 DOI: 10.1039/c8ra08823c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 12/03/2018] [Indexed: 01/11/2023] Open
Abstract
Potassium halides (KX; X = I, Br, or Cl) were incorporated as partial replacements of CsBr in the mechanosynthesis of CsPbBr3. This led to partial substitution of both monovalent ions forming mixed Cs1−xKxPbBr3−yXy perovskites. Longer photoluminescence lifetimes were also observed, possibly linked to the formation of a non-perovskite KPb2X5 passivating layer. Potassium halides are used for cation-exchange, anion-exchange and trap passivation of mechanosynthesized perovskites.![]()
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Affiliation(s)
- Yousra El Ajjouri
- Instituto de Ciencia Molecular, ICMol
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - Vladimir S. Chirvony
- Instituto de Ciencia Molecular, ICMol
- Universidad de Valencia
- 46980 Paterna
- Spain
- UMDO (Unidad de Materiales y Dispositivos Optoelectrónicos)
| | - Michele Sessolo
- Instituto de Ciencia Molecular, ICMol
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - Francisco Palazon
- Instituto de Ciencia Molecular, ICMol
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - Henk J. Bolink
- Instituto de Ciencia Molecular, ICMol
- Universidad de Valencia
- 46980 Paterna
- Spain
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