Photo-homogenization assisted segregation easing technique (PHASET) for highly efficient and stable wide-bandgap perovskite solar cells

Liming Du, Fangfang Cao, Rui Meng, Yueying Zhang, Junchuan Zhang, Zhiyu Gao, Cong Chen, Can Li, Dewei Zhao, Jichun Ye, Zhen Li () and Chuanxiao Xiao ()
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Liming Du: Northwestern Polytechnical University
Fangfang Cao: Chinese Academy of Sciences
Rui Meng: Northwestern Polytechnical University
Yueying Zhang: Chinese Academy of Sciences
Junchuan Zhang: Chinese Academy of Sciences
Zhiyu Gao: Ministry of Education, Sichuan University
Cong Chen: Ministry of Education, Sichuan University
Can Li: Northwestern Polytechnical University
Dewei Zhao: Ministry of Education, Sichuan University
Jichun Ye: Chinese Academy of Sciences
Zhen Li: Northwestern Polytechnical University
Chuanxiao Xiao: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Wide-bandgap (WBG) perovskite solar cells (PSCs) can exceed the Shockley–Queisser limit in tandem solar cells (TSCs), but phase segregation under continuous illumination limits their stability. Using in-situ microscopic characterizations, we investigate the dynamics of photon-induced phase segregation. Initial light soaking drives iodide diffusion into a metastable state, but continued redistribution increases the phase separation energy barrier, resulting in a more stable, segregation-resistant state. Inspired by stabilization methods in silicon photovoltaics, we develop the Photo-Homogenization Assisted Segregation Easing Technique (PHASET), which combines light soaking with 2-ThEABr surface passivation to suppress halide segregation. PHASET enhances efficiency and stability, enabling an efficiency of 20.23% for 1.79 eV WBG-PSCs, with 97% of the initial efficiency retained after 1200 hours of continuous illumination. Integration with a 1.25 eV narrow-bandgap subcell results in a two-terminal all-perovskite TSC with 28.64% efficiency, retaining 77% of its initial performance after 1200 hours of maximum power point tracking.

Date: 2025
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DOI: 10.1038/s41467-025-63176-w

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