Electron-withdrawing organic ligand for high-efficiency all-perovskite tandem solar cells

Danni Yu, Mengling Pan, Gaoqi Liu, Xianyuan Jiang, Xin Wen, Wenzhuo Li, Shaojie Chen, Wenjia Zhou, Hao Wang, Yue Lu, Mingyu Ma, Zihao Zang, Peihong Cheng, Qingqing Ji, Fan Zheng and Zhijun Ning ()
Additional contact information
Danni Yu: ShanghaiTech University
Mengling Pan: ShanghaiTech University
Gaoqi Liu: ShanghaiTech University
Xianyuan Jiang: ShanghaiTech University
Xin Wen: ShanghaiTech University
Wenzhuo Li: ShanghaiTech University
Shaojie Chen: ShanghaiTech University
Wenjia Zhou: ShanghaiTech University
Hao Wang: ShanghaiTech University
Yue Lu: ShanghaiTech University
Mingyu Ma: ShanghaiTech University
Zihao Zang: ShanghaiTech University
Peihong Cheng: ShanghaiTech University
Qingqing Ji: ShanghaiTech University
Fan Zheng: ShanghaiTech University
Zhijun Ning: ShanghaiTech University

Nature Energy, 2024, vol. 9, issue 3, 298-307

Abstract: Abstract Tin–lead mixed perovskite-based tandem solar cells show promise. However, the inherent oxidation of tin remains a challenge for achieving high power conversion efficiency and device stability. In this study, we present an approach to address this challenge by developing an electron-withdrawing chloromethyl phosphonic acid ligand based on the substituent effect, designed to mitigate tin oxidation in tin–lead mixed perovskite materials. The introduction of this electron-withdrawing ligand improves the redox potential of the tin adduct. Furthermore, it leads to a substantial increase in the ionization potential of the perovskite structure. Through comparative analysis with conventional coordinating molecules, we reveal that the electron-withdrawing ligand is more effective in suppressing tin oxidation and reducing the defect density within the tin-based perovskite film. Using our approach, we demonstrate certified efficiency of 26.96% for all-perovskite tandem solar cells.

Date: 2024
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DOI: 10.1038/s41560-023-01441-2

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