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<p>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 <i>α</i>-FAPbI<sub>3</sub> 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 FAPbI<sub>3</sub>-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.</p>

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Mitigating residual MA+ for stable FAPbI3 perovskite photovoltaics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月18日

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  • 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,
  • Rui Wang

摘要

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.