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<p>Despite significant advancements in power conversion efficiency, thermal instability remains a key challenge for organic photovoltaics. Here we propose a stabilization strategy that addresses both intrinsic and extrinsic stability. We first introduce the UV–vis absorption onset temperature (<i>T</i><sub>onset</sub>) as a metric for evaluating the intrinsic thermal stability of polymer blends, enabling material screening. Then, we identify interfacial chemical reactions at the polymer blend/MoO<sub>3</sub> interface as the primary extrinsic thermal degradation pathway, which can be suppressed by inserting a thin C<sub>60</sub> interlayer that consequently improves thermal stability of the cells. Finally, by establishing quantitative models to characterize the moisture diffusion over the encapsulated cells, we can quantify the effectiveness of encapsulation. These advances enable organic photovoltaic cells with approximately 18% efficiency to retain 94% of their initial efficiency after 1,032-hour 85 °C/85% relative humidity damp heat and 200 thermal cycles (−40 °C to 85 °C) tests, among the highest stabilities reported under the damp heat (ISOS-D-3) and thermal cycling (ISOS-T-3) testing standards.</p>

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Improved damp heat and thermal cycling stability of organic solar cells

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Jian Qin,
  • Qian Xi,
  • Na Wu,
  • Bowen Liu,
  • Chao Yue,
  • Jin Fang,
  • Zhenguo Wang,
  • Yanbin Du,
  • Qing Zhang,
  • Zhen Wang,
  • Wei Wang,
  • Muhammad Jawad,
  • Jinjing Qiu,
  • Weishi Li,
  • Qun Luo,
  • Chang-Qi Ma

摘要

Despite significant advancements in power conversion efficiency, thermal instability remains a key challenge for organic photovoltaics. Here we propose a stabilization strategy that addresses both intrinsic and extrinsic stability. We first introduce the UV–vis absorption onset temperature (Tonset) as a metric for evaluating the intrinsic thermal stability of polymer blends, enabling material screening. Then, we identify interfacial chemical reactions at the polymer blend/MoO3 interface as the primary extrinsic thermal degradation pathway, which can be suppressed by inserting a thin C60 interlayer that consequently improves thermal stability of the cells. Finally, by establishing quantitative models to characterize the moisture diffusion over the encapsulated cells, we can quantify the effectiveness of encapsulation. These advances enable organic photovoltaic cells with approximately 18% efficiency to retain 94% of their initial efficiency after 1,032-hour 85 °C/85% relative humidity damp heat and 200 thermal cycles (−40 °C to 85 °C) tests, among the highest stabilities reported under the damp heat (ISOS-D-3) and thermal cycling (ISOS-T-3) testing standards.