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<p>Non-fused ring electron acceptors (NFREAs) exhibit substantial commercial application potential. Nevertheless, their subpar electron transport performance results in slightly low power conversion efficiencies (PCEs) of organic solar cells (OSCs). Herein, we put forward an innovative supramolecular side-chain-induced multi-dimensional charge transport strategy to exploit two NFREAs 3TT-Ph2 and 3TT-Ph4 with terminal phenyl/fluorinated phenyl side chains. In comparison to the unfunctionalized control molecule 3TT-2, both 3TT-Ph2 and 3TT-Ph4 form additional phenyl-acceptor (Ph-A) supramolecular interactions between the phenyl side groups and the cyanoindanone end groups. Meanwhile, these fluorinated terminal phenyl groups can induce the formation of multiple supramolecular interactions, including F···F, F···H and F···C. The synergistic effect of these supramolecular interactions promotes the tight and ordered stacking of molecules, facilitates the construction of multi-dimensional charge transport channel. Finally, D18:3TT-Ph4-based device achieved a record-breaking PCE of 19.12% and a fill factor of 80.65%. Our research pave an&#xa0;effective strategy for the molecular design of high-performance NFREAs.</p>

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Attaining 19.12% solar cell efficiency for non-fused ring electron acceptors via multi-dimensional charge transport

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月18日

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  • Miao Li,
  • Qianqian Zhu,
  • Nan Wei,
  • Yuanyuan Zhou,
  • Guangliu Ran,
  • Shuaishuai Shen,
  • Zhiying Ma,
  • Longfei Jia,
  • Wenchao Zhao,
  • Jiahe Zhang,
  • Wenkai Zhang,
  • Wenjun Zhang,
  • Yuanyuan Zuo,
  • Ruiping Qin,
  • Xiaodan Tang,
  • Congxin Xia,
  • Jinsheng Song,
  • Zhishan Bo,
  • Yahui Liu

摘要

Non-fused ring electron acceptors (NFREAs) exhibit substantial commercial application potential. Nevertheless, their subpar electron transport performance results in slightly low power conversion efficiencies (PCEs) of organic solar cells (OSCs). Herein, we put forward an innovative supramolecular side-chain-induced multi-dimensional charge transport strategy to exploit two NFREAs 3TT-Ph2 and 3TT-Ph4 with terminal phenyl/fluorinated phenyl side chains. In comparison to the unfunctionalized control molecule 3TT-2, both 3TT-Ph2 and 3TT-Ph4 form additional phenyl-acceptor (Ph-A) supramolecular interactions between the phenyl side groups and the cyanoindanone end groups. Meanwhile, these fluorinated terminal phenyl groups can induce the formation of multiple supramolecular interactions, including F···F, F···H and F···C. The synergistic effect of these supramolecular interactions promotes the tight and ordered stacking of molecules, facilitates the construction of multi-dimensional charge transport channel. Finally, D18:3TT-Ph4-based device achieved a record-breaking PCE of 19.12% and a fill factor of 80.65%. Our research pave an effective strategy for the molecular design of high-performance NFREAs.