Mitigating residual MA+ for stable FAPbI3 perovskite photovoltaics

Ke Zhao, Libing Yao, Caner Değer, Xu Zhang, Jiahui Shen, Xiaohe Miao, Pengju Shi, Yixin Luo, Donger Jin, Yuan Tian, Jiazhe Xu, Shaochen Zhang, Qingqing Liu, Shenglong Chu, Xiaonan Wang, Liuwen Tian, Ilhan Yavuz, Jingjing Xue and Rui Wang ()
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Ke Zhao: Westlake University
Libing Yao: Westlake University
Caner Değer: Marmara University, Ziverbey
Xu Zhang: Westlake University
Jiahui Shen: Zhejiang University
Xiaohe Miao: Westlake University
Pengju Shi: Westlake University
Yixin Luo: Zhejiang University
Donger Jin: Zhejiang University
Yuan Tian: Westlake University
Jiazhe Xu: Westlake University
Shaochen Zhang: Westlake University
Qingqing Liu: Westlake University
Shenglong Chu: Westlake University
Xiaonan Wang: Westlake University
Liuwen Tian: Westlake University
Ilhan Yavuz: Zhejiang University
Jingjing Xue: Zhejiang University
Rui Wang: Westlake University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Perovskite solar cells (PSCs) based on formamidinium lead iodide (FAPbI₃) demonstrate near-ideal bandgaps approaching the Shockley-Queisser efficiency limit, yet residual MA⁺ from methylammonium chloride (MACl) additives compromises their operational stability under thermal/light stress. Therefore, we developed an α-phase-assisted antisolvent method employing MACl-free precursors to fabricate α-FAPbI3 films. These films exhibit enhanced thermal stability and structural integrity, which were comprehensively characterized using multiple techniques. The optimized devices achieved a 26.1% power conversion efficiency (PCE), ranking among one of the highest reported values for FAPbI3-based inverted PSCs, and exhibit sustained stability under accelerated aging conditions. This strategy resolves the MA⁺-induced degradation bottleneck, paving the way for commercially viable high-performance PSCs.

Date: 2025
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DOI: 10.1038/s41467-025-65045-y

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