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<p>Self-assembled hole-selective molecules (SHMs) can enhance the efficiency and stability of inverted perovskite solar cells (PSCs). Their molecular structures and assembly arrangement at buried interfaces determine charge-transfer dynamics, perovskite crystallization and photovoltaic performance. We design self-assembled molecules featuring a laterally extended π-scaffold by attaching two flanking phenyl groups onto the 7<i>H</i>-dibenzo[<i>c</i>,<i>g</i>]carbazole. This design manipulates the molecular packing, resulting in a quasi-random oriented assembly on the substrate to accelerate the interfacial hole-transfer kinetics at both the substrate/SHM and SHM/perovskite interfaces. The solar cells achieve a stabilized power conversion efficiency of 27.1% (certified stabilized 26.67%) for a small-area PSC and 26.0% (certified stabilized 25.94%) for a 1-cm<sup>2</sup> device. The small-area device retains 95% of its initial efficiency over 1,630 hours under 1-sun operation at 65 °C and 91% over 1,240 hours operation at 85 °C. These findings provide insights for designing improved self-assembled molecular contacts for inverted PSCs.</p>

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Quasi-random oriented molecular contacts for inverted perovskite solar cells with improved efficiency

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Tianyu Li,
  • Wenlin Jiang,
  • Tonghui Wang,
  • Yingguo Yang,
  • Jiali Liu,
  • Yaxin Zhai,
  • Chenkai Liu,
  • Miaoling Lin,
  • Pingheng Tan,
  • Zhenwei Jiang,
  • Xinping Wang,
  • Hengyu Zhang,
  • Zhenyi Ni,
  • Qingqing Dai,
  • Chun-To Wong,
  • Zhaoyang Han,
  • Zhenhan Wang,
  • Xingwang Zhang,
  • Qing Jiang,
  • Alex K.-Y. Jen,
  • Qi Jiang

摘要

Self-assembled hole-selective molecules (SHMs) can enhance the efficiency and stability of inverted perovskite solar cells (PSCs). Their molecular structures and assembly arrangement at buried interfaces determine charge-transfer dynamics, perovskite crystallization and photovoltaic performance. We design self-assembled molecules featuring a laterally extended π-scaffold by attaching two flanking phenyl groups onto the 7H-dibenzo[c,g]carbazole. This design manipulates the molecular packing, resulting in a quasi-random oriented assembly on the substrate to accelerate the interfacial hole-transfer kinetics at both the substrate/SHM and SHM/perovskite interfaces. The solar cells achieve a stabilized power conversion efficiency of 27.1% (certified stabilized 26.67%) for a small-area PSC and 26.0% (certified stabilized 25.94%) for a 1-cm2 device. The small-area device retains 95% of its initial efficiency over 1,630 hours under 1-sun operation at 65 °C and 91% over 1,240 hours operation at 85 °C. These findings provide insights for designing improved self-assembled molecular contacts for inverted PSCs.