Suppression of phase segregation in wide-bandgap perovskites with thiocyanate ions for perovskite/organic tandems with 25.06% efficiency

Zhichao Zhang, Weijie Chen (), Xingxing Jiang, Jianlei Cao, Haidi Yang, Haiyang Chen, Fu Yang, Yunxiu Shen, Heyi Yang, Qinrong Cheng, Xining Chen, Xiaohua Tang, Shuaiqing Kang, Xue-mei Ou, Christoph J. Brabec (), Yaowen Li () and Yongfang Li
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Zhichao Zhang: Soochow University
Weijie Chen: Soochow University
Xingxing Jiang: Hunan University
Jianlei Cao: Soochow University
Haidi Yang: Soochow University
Haiyang Chen: Soochow University
Fu Yang: Soochow University
Yunxiu Shen: Soochow University
Heyi Yang: Soochow University
Qinrong Cheng: Soochow University
Xining Chen: Soochow University
Xiaohua Tang: Soochow University
Shuaiqing Kang: Soochow University
Xue-mei Ou: Soochow University
Christoph J. Brabec: Friedrich-Alexander University Erlangen-Nürnberg
Yaowen Li: Soochow University
Yongfang Li: Soochow University

Nature Energy, 2024, vol. 9, issue 5, 592-601

Abstract: Abstract Mixed halide wide-bandgap perovskites are suitable for integration in tandem photovoltaics such as perovskite/organic tandem solar cells. However, halide phase segregation originating from halogen vacancy-assisted ion migration in wide-bandgap perovskites limits the device efficiency and lifetime. Here we incorporate pseudo-halogen thiocyanate (SCN) ions in iodide/bromide mixed halide perovskites and show that they enhance crystallization and reduce grain boundaries. Trace amount of SCN ions in the bulk enter the perovskite lattice, forming an I/Br/SCN alloy, and occupy iodine vacancies, blocking halide ion migration via steric hindrance. Taken together, these effects retard halide phase segregation under operation and reduce energy loss in the wide-bandgap perovskite cells. The resulting perovskite/organic tandem solar cell achieves a power conversion efficiency of 25.82% (certified 25.06%) and an operational stability of 1,000 h.

Date: 2024
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DOI: 10.1038/s41560-024-01491-0

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