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<p>The migration of iodide ions out of the perovskite film degrades charge transport and electrode layers, reducing the long-term stability of perovskite solar cells. The current strategy primarily employs blocking layers atop the perovskite film to suppress this migration. However, the layers cannot completely prevent ion movement due to trade-offs with carrier transport. In this work, we quantify the barrier energy required to prevent the iodide ions migration from the perovskite film and develop a composite layer that leverages scattering and drift effects on perovskite surface to meet this threshold, reducing ions migration by 99.9%. Moreover, we utilize Poly(N-vinylcarbazole) with a high work function as hole transport material to address the band shift caused by the drift electric-field, thus enhancing hole extraction efficiency. Eventually, the device achieves a certified steady-state efficiency of 25.7% and maintains &gt;95% of the initial efficiency after 1500 hours at 85 °C under maximum power point tracking.</p>

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Confining iodide migration with quantified barrier for durable perovskite solar cells

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月22日

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  • Hongcai Tang,
  • Yangzi Shen,
  • Ge Yan,
  • Liyuan Han,
  • Qifeng Han

摘要

The migration of iodide ions out of the perovskite film degrades charge transport and electrode layers, reducing the long-term stability of perovskite solar cells. The current strategy primarily employs blocking layers atop the perovskite film to suppress this migration. However, the layers cannot completely prevent ion movement due to trade-offs with carrier transport. In this work, we quantify the barrier energy required to prevent the iodide ions migration from the perovskite film and develop a composite layer that leverages scattering and drift effects on perovskite surface to meet this threshold, reducing ions migration by 99.9%. Moreover, we utilize Poly(N-vinylcarbazole) with a high work function as hole transport material to address the band shift caused by the drift electric-field, thus enhancing hole extraction efficiency. Eventually, the device achieves a certified steady-state efficiency of 25.7% and maintains >95% of the initial efficiency after 1500 hours at 85 °C under maximum power point tracking.