Surface in situ reconstruction of inorganic perovskite films enabling long carrier lifetimes and solar cells with 21% efficiency

Xinbo Chu, Qiufeng Ye, Zhenhan Wang, Chen Zhang, Fei Ma, Zihan Qu, Yang Zhao, Zhigang Yin, Hui-Xiong Deng (), Xingwang Zhang and Jingbi You ()
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Xinbo Chu: Chinese Academy of Sciences
Qiufeng Ye: Chinese Academy of Sciences
Zhenhan Wang: Chinese Academy of Sciences
Chen Zhang: University of Chinese Academy of Sciences
Fei Ma: Chinese Academy of Sciences
Zihan Qu: Chinese Academy of Sciences
Yang Zhao: Chinese Academy of Sciences
Zhigang Yin: Chinese Academy of Sciences
Hui-Xiong Deng: University of Chinese Academy of Sciences
Xingwang Zhang: Chinese Academy of Sciences
Jingbi You: Chinese Academy of Sciences

Nature Energy, 2023, vol. 8, issue 4, 372-380

Abstract: Abstract All-inorganic perovskites are emerging as excellent photovoltaic candidates for single-junction or tandem solar cells. However, large energy loss due to non-radiative recombination is the main constraint for performance enhancement. Accordingly, we developed a surface in situ reconstruction (SISR) strategy for inorganic perovskite by CsF treatment, which can suppress non-radiative recombination and promote hole extraction simultaneously. Surface defects can be effectively passivated by the introduced fluorine, and carrier lifetime was prolonged from 11.5 ns to 737.2 ns. In addition, a wider-bandgap perovskite layer can be generated as a graded heterojunction to facilitate hole extraction. The SISR reaction mechanism was also verified from both kinetic calculations and experiments. As a result, CsPbIxBr3−x solar cell with SISR achieved an efficiency of 21.02% with a high open-circuit voltage of 1.27 V and fill factor of 85.3%. This work provides an effective approach to modulate inorganic perovskite surfaces for the design of efficient solar cells.

Date: 2023
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DOI: 10.1038/s41560-023-01220-z

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