Enhanced charge carrier transport and defects mitigation of passivation layer for efficient perovskite solar cells

Zihan Qu, Yang Zhao, Fei Ma, Le Mei, Xian-Kai Chen, Haitao Zhou, Xinbo Chu, Yingguo Yang, Qi Jiang, Xingwang Zhang and Jingbi You ()
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Zihan Qu: Chinese Academy of Sciences
Yang Zhao: Chinese Academy of Sciences
Fei Ma: Chinese Academy of Sciences
Le Mei: City University of Hong Kong
Xian-Kai Chen: Soochow University
Haitao Zhou: Chinese Academy of Sciences
Xinbo Chu: Chinese Academy of Sciences
Yingguo Yang: Chinese Academy of Sciences
Qi Jiang: Chinese Academy of Sciences
Xingwang Zhang: Chinese Academy of Sciences
Jingbi You: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Surface passivation has been developed as an effective strategy to reduce trap-state density and suppress non-radiation recombination process in perovskite solar cells. However, passivation agents usually own poor conductivity and hold negative impact on the charge carrier transport in device. Here, we report a binary and synergistical post-treatment method by blending 4-tert-butyl-benzylammonium iodide with phenylpropylammonium iodide and spin-coating on perovskite surface to form passivation layer. The binary and synergistical post-treated films show enhanced crystallinity and improved molecular packing as well as better energy band alignment, benefiting for the hole extraction and transfer. Moreover, the surface defects are further passivated compared with unary passivation. Based on the strategy, a record-certified quasi-steady power conversion efficiency of 26.0% perovskite solar cells is achieved. The devices could maintain 81% of initial efficiency after 450 h maximum power point tracking.

Date: 2024
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DOI: 10.1038/s41467-024-52925-y

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