Superior photo-carrier diffusion dynamics in organic-inorganic hybrid perovskites revealed by spatiotemporal conductivity imaging

Xuejian Ma, Fei Zhang, Zhaodong Chu, Ji Hao, Xihan Chen, Jiamin Quan, Zhiyuan Huang, Xiaoming Wang, Xiaoqin Li, Yanfa Yan, Kai Zhu () and Keji Lai ()
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Xuejian Ma: University of Texas at Austin
Fei Zhang: National Renewable Energy Laboratory, Golden
Zhaodong Chu: University of Texas at Austin
Ji Hao: National Renewable Energy Laboratory, Golden
Xihan Chen: National Renewable Energy Laboratory, Golden
Jiamin Quan: University of Texas at Austin
Zhiyuan Huang: National Renewable Energy Laboratory, Golden
Xiaoming Wang: University of Toledo
Xiaoqin Li: University of Texas at Austin
Yanfa Yan: University of Toledo
Kai Zhu: National Renewable Energy Laboratory, Golden
Keji Lai: University of Texas at Austin

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The outstanding performance of organic-inorganic metal trihalide solar cells benefits from the exceptional photo-physical properties of both electrons and holes in the material. Here, we directly probe the free-carrier dynamics in Cs-doped FAPbI3 thin films by spatiotemporal photoconductivity imaging. Using charge transport layers to selectively quench one type of carriers, we show that the two relaxation times on the order of 1 μs and 10 μs correspond to the lifetimes of electrons and holes in FACsPbI3, respectively. Strikingly, the diffusion mapping indicates that the difference in electron/hole lifetimes is largely compensated by their disparate mobility. Consequently, the long diffusion lengths (3~5 μm) of both carriers are comparable to each other, a feature closely related to the unique charge trapping and de-trapping processes in hybrid trihalide perovskites. Our results unveil the origin of superior diffusion dynamics in this material, crucially important for solar-cell applications.

Date: 2021
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DOI: 10.1038/s41467-021-25311-1

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