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<p>Thin-film tandem solar cells with wide-bandgap perovskites and Cu(In,Ga)Se<sub>2</sub> hold promise for cost-effective lightweight photovoltaics. However, the power conversion efficiency and stability of perovskite/Cu(In,Ga)Se<sub>2</sub> tandem solar cells are not yet comparable to single-junction counterparts due to recombination losses and photothermal-induced degradation in wide-bandgap perovskites. In this study, we show that common strategies for perovskite passivation often fail under combined thermal and illumination stresses due to the passivator desorption. We demonstrate a robust passivator with deliberately designed functional groups that inhibits passivator desorption regardless of perovskite surface termination, enhances resistance to photothermal stresses and substantially suppresses phase segregation. The wide-bandgap perovskite solar cells achieved a champion power conversion efficiency of 23.5% with negligible degradation after 1,000 hours of continuous operation under 1-sun illumination at approximately 50 °C. When integrated into perovskite/Cu(In,Ga)Se<sub>2</sub> tandem cells, they achieved the steady state power conversion efficiency of 27.93% (certified 27.35%), with stable operation for over 420 hours at ~38 °C in ambient air.</p>

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Inhibiting defect passivation failure in perovskite for perovskite/Cu(In,Ga)Se2 monolithic tandem solar cells with certified efficiency 27.35%

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Fengtao Pei,
  • Shuping Lin,
  • Zhongyang Zhang,
  • Shiju Lin,
  • Xingye Huang,
  • Ming Zhao,
  • Jian Xu,
  • Xinmeng Zhuang,
  • Ying Zhang,
  • Jiahong Tang,
  • Yanrun Chen,
  • Kailin Li,
  • Lan Wang,
  • Guilin Liu,
  • Dongmin Qian,
  • Huifeng Liu,
  • Wentao Zhou,
  • Yihua Chen,
  • Jianpu Wang,
  • Huanping Zhou,
  • Boyan Li,
  • Dalong Zhong,
  • Yan Jiang,
  • Qi Chen

摘要

Thin-film tandem solar cells with wide-bandgap perovskites and Cu(In,Ga)Se2 hold promise for cost-effective lightweight photovoltaics. However, the power conversion efficiency and stability of perovskite/Cu(In,Ga)Se2 tandem solar cells are not yet comparable to single-junction counterparts due to recombination losses and photothermal-induced degradation in wide-bandgap perovskites. In this study, we show that common strategies for perovskite passivation often fail under combined thermal and illumination stresses due to the passivator desorption. We demonstrate a robust passivator with deliberately designed functional groups that inhibits passivator desorption regardless of perovskite surface termination, enhances resistance to photothermal stresses and substantially suppresses phase segregation. The wide-bandgap perovskite solar cells achieved a champion power conversion efficiency of 23.5% with negligible degradation after 1,000 hours of continuous operation under 1-sun illumination at approximately 50 °C. When integrated into perovskite/Cu(In,Ga)Se2 tandem cells, they achieved the steady state power conversion efficiency of 27.93% (certified 27.35%), with stable operation for over 420 hours at ~38 °C in ambient air.