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<p>Organic molecules that serve as hole-selective contacts, known as self-assembled monolayers (SAMs), play a pivotal role in ensuring high-performance perovskite photovoltaics. Optimal energy alignment between the SAM and the perovskite is essential for desired photovoltaic performance. However, many SAMs are studied in optimal-bandgap perovskites, with limited energy level modification specifically catering to wide-bandgap perovskites. Herein, we demonstrate that the energy level of SAMs can be systematically tuned in a stepwise manner via inductive effects in the conjugated moieties, enabling rational design tailored for specific perovskite bandgaps. The resulting WBG perovskite device based on our tuned SAM achieved a power conversion efficiency (PCE) of 22.8%. Integration with crystalline silicon TOPCon subcells further enabled the construction of a perovskite/TOPCon tandem device with a PCE of 31.1% (certified 30.9%).</p>

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Inductive effects in molecular contacts enable wide-bandgap perovskite cells for efficient perovskite/TOPCon tandems

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月15日

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  • Yixin Luo,
  • Yuan Tian,
  • Ke Zhao,
  • Weiping Mao,
  • Chen Liu,
  • Jiahui Shen,
  • Zhendong Cheng,
  • Caner Değer,
  • Xiaohe Miao,
  • Zhongwei Zhang,
  • Xuechun Sun,
  • Libing Yao,
  • Xu Zhang,
  • Pengju Shi,
  • Donger Jin,
  • Jiaxiao Deng,
  • Mengyuan Tian,
  • Ilhan Yavuz,
  • Na Dong,
  • Ruzhang Liu,
  • Rui Wang,
  • Deren Yang,
  • Jingjing Xue

摘要

Organic molecules that serve as hole-selective contacts, known as self-assembled monolayers (SAMs), play a pivotal role in ensuring high-performance perovskite photovoltaics. Optimal energy alignment between the SAM and the perovskite is essential for desired photovoltaic performance. However, many SAMs are studied in optimal-bandgap perovskites, with limited energy level modification specifically catering to wide-bandgap perovskites. Herein, we demonstrate that the energy level of SAMs can be systematically tuned in a stepwise manner via inductive effects in the conjugated moieties, enabling rational design tailored for specific perovskite bandgaps. The resulting WBG perovskite device based on our tuned SAM achieved a power conversion efficiency (PCE) of 22.8%. Integration with crystalline silicon TOPCon subcells further enabled the construction of a perovskite/TOPCon tandem device with a PCE of 31.1% (certified 30.9%).