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<p>CsPbI<sub>3</sub>, an inorganic perovskite with an excellent bandgap and thermal stability, exhibits great potential for Si-perovskite tandem solar cells although it is highly sensitive to moisture. Here we address this by fabricating CsPbI<sub>3</sub> solar cells under high humidity, controlling annealing via the humidity-dependent volatilization of dimethylammonium iodide. Surface passivation with 1,8-diaminooctane (DAO) reduces Pb surface defects, which enhances charge transport and forms a hydrophobic, moisture-resistant film. The DAO-passivated CsPbI<sub>3</sub> solar cell achieves a power conversion efficiency of 17.7% and retains 92.3% of its initial efficiency after 1500 minutes of maximum power point tracking in 30% relative humidity without encapsulation, demonstrating improved humidity stability. All solution-processed layers were fabricated in ambient air, highlighting their potential for cost-effective mass production.</p>

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Inverted CsPbI3 perovskite solar cells with all solution processed layers fabricated in high humidity

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月12日

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  • Sangwon Lee,
  • Sujin Cho,
  • Seok-Hyun Jeong,
  • Wonkyu Lee,
  • Dowon Pyun,
  • Jiyeon Nam,
  • Ji-Seong Hwang,
  • Youngmin Kim,
  • Jihyun Jang,
  • Yoonmook Kang,
  • Donghwan Kim,
  • Hae-Seok Lee

摘要

CsPbI3, an inorganic perovskite with an excellent bandgap and thermal stability, exhibits great potential for Si-perovskite tandem solar cells although it is highly sensitive to moisture. Here we address this by fabricating CsPbI3 solar cells under high humidity, controlling annealing via the humidity-dependent volatilization of dimethylammonium iodide. Surface passivation with 1,8-diaminooctane (DAO) reduces Pb surface defects, which enhances charge transport and forms a hydrophobic, moisture-resistant film. The DAO-passivated CsPbI3 solar cell achieves a power conversion efficiency of 17.7% and retains 92.3% of its initial efficiency after 1500 minutes of maximum power point tracking in 30% relative humidity without encapsulation, demonstrating improved humidity stability. All solution-processed layers were fabricated in ambient air, highlighting their potential for cost-effective mass production.