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<p>Designing small-molecule acceptors (SMAs) with long exciton diffusion length (<i>L</i><sub>D</sub>) and high electron mobility is vital for boosting power conversion efficiency (PCE) of organic solar cells (OSCs). However, the limited <i>L</i><sub>D</sub> of most advanced SMAs hinders their practical applications in thick-film OSCs. Herein, we develop four SMAs (named Yq-0F, Yq-2F, Yq-4F, and Yq-6F) with fluorine-free/fluorinated phenyl-substituted quinoxaline cores by manipulating the number of fluorine atom. Among them, polyfluorophenyl-substituted Yq-4F exhibits superior 3D network crystal framework and favourable intermolecular packing, leading to optimal blend morphology with polymer donor D18. Therefore, D18:Yq-4F system achieves improved carrier mobilities and suppressed charge recombination loss. Consequently, the D18:Yq-4F based binary OSCs provide a PCE of 18.30%, surpassing these ones based on D18:Yq-0F (11.27%), D18:Yq-2F (17.73%), and D18:Yq-6F (17.00%). When introducing Yq-4F as a guest into D18:L8-BO host to fabricate ternary OSCs, the PCE further increases to 20.77%, as the highest reported value among quinoxaline-derived SMAs. Moreover, ternary D18:Yq-4F:BTP-eC9 and D18:L8-BO:Yq-4F OSCs with ~500 nm active layer thickness offer impressive PCEs of &gt;17%, ranking among the top values for thick-film devices with similar thickness. This work offers an effective SMA design strategy for opening a path towards efficient thin-film and thick-film OSCs simultaneously.</p>

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Polyfluorophenyl quinoxaline derived acceptors with long exciton diffusion length for efficient thin-film/thick-film organic solar cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月10日

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  • Kai Xiang,
  • Zihao Deng,
  • Wenyan Su,
  • Hairui Bai,
  • Bitao Dong,
  • Na Chen,
  • Ning Su,
  • Haotian Wu,
  • Zhaozhao Bi,
  • Han Liu,
  • Tengfei Li,
  • Yanan Shen,
  • Ke Wang,
  • Dandan Zhang,
  • Rui Sun,
  • Muhammad Hamza Maqsood,
  • Ping Li,
  • Lihe Yan,
  • Guanghao Lu,
  • Yuhang Liu,
  • Jin-Liang Wang,
  • Feng He,
  • Jianhua Chen,
  • Wei Ma,
  • Qunping Fan

摘要

Designing small-molecule acceptors (SMAs) with long exciton diffusion length (LD) and high electron mobility is vital for boosting power conversion efficiency (PCE) of organic solar cells (OSCs). However, the limited LD of most advanced SMAs hinders their practical applications in thick-film OSCs. Herein, we develop four SMAs (named Yq-0F, Yq-2F, Yq-4F, and Yq-6F) with fluorine-free/fluorinated phenyl-substituted quinoxaline cores by manipulating the number of fluorine atom. Among them, polyfluorophenyl-substituted Yq-4F exhibits superior 3D network crystal framework and favourable intermolecular packing, leading to optimal blend morphology with polymer donor D18. Therefore, D18:Yq-4F system achieves improved carrier mobilities and suppressed charge recombination loss. Consequently, the D18:Yq-4F based binary OSCs provide a PCE of 18.30%, surpassing these ones based on D18:Yq-0F (11.27%), D18:Yq-2F (17.73%), and D18:Yq-6F (17.00%). When introducing Yq-4F as a guest into D18:L8-BO host to fabricate ternary OSCs, the PCE further increases to 20.77%, as the highest reported value among quinoxaline-derived SMAs. Moreover, ternary D18:Yq-4F:BTP-eC9 and D18:L8-BO:Yq-4F OSCs with ~500 nm active layer thickness offer impressive PCEs of >17%, ranking among the top values for thick-film devices with similar thickness. This work offers an effective SMA design strategy for opening a path towards efficient thin-film and thick-film OSCs simultaneously.