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Inorganic A-site cations improve the performance of band-edge carriers in lead halide perovskites |
Cheng Wang1, Yaoguang Rong2, Ti Wang1() |
1. Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China 2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract In lead halide perovskites, organic A-site cations are generally introduced to fine-tune the properties. One of the questions under debate is whether organic A-site cations are essential for high-performance solar cells. In this study, we compare the band edge carrier dynamics and diffusion process in MAPbBr3 and CsPbBr3 single-crystal microplates. By transient absorption microscopy, the band-edge carrier diffusion constants are unraveled. With the replacement of inorganic A-site cations, the diffusion constant in CsPbBr3 increases almost 8 times compared to that in MAPbBr3. This work reveals that introducing inorganic A-site cations can lead to a much larger diffusion length and improve the performance of band-edge carriers.
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Keywords
Perovskite
Inorganic cations
Carrier diffusion
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Corresponding Author(s):
Ti Wang
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About author: Peng Lei and Charity Ngina Mwangi contributed equally to this work. |
Issue Date: 26 October 2023
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