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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Xuejian Ma & Fei Zhang & Zhaodong Chu & Ji Hao & Xihan Chen & Jiamin Quan & Zhiyuan Huang & Xiaoming Wang & Xiaoqin Li & Yanfa Yan & Kai Zhu & Keji Lai, 2021. "Superior photo-carrier diffusion dynamics in organic-inorganic hybrid perovskites revealed by spatiotemporal conductivity imaging," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25311-1
    DOI: 10.1038/s41467-021-25311-1
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    Cited by:

    1. Dejian Yu & Fei Cao & Jinfeng Liao & Bingzhe Wang & Chenliang Su & Guichuan Xing, 2022. "Direct observation of photoinduced carrier blocking in mixed-dimensional 2D/3D perovskites and the origin," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. Jiaxin Pan & Ziming Chen & Tiankai Zhang & Beier Hu & Haoqing Ning & Zhu Meng & Ziyu Su & Davide Nodari & Weidong Xu & Ganghong Min & Mengyun Chen & Xianjie Liu & Nicola Gasparini & Saif A. Haque & Pi, 2023. "Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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