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<p>Non-fused ring electron acceptors (NFREAs) feature simple synthetic procedures and remarkable cost-effectiveness, endowing them with great potential for pioneering applications in organic solar cell (OSC) commercialization. However, the rotation of C–C single bonds in these acceptors causes weak intermolecular interactions and low charge mobility, restricting further improvement of their power conversion efficiency (PCE). In this study, we designed and successfully synthesized three isomeric NFREAs. By regulating oxygen atom positions in side chains, we modulated intermolecular interactions, optimized thin-film morphology, and enhanced charge transport capability. Experimental results showed that molecular crystallinity gradually decreased with the outward shift of oxygen atoms. Among them, BTh-O-2 exhibited a higher molar extinction coefficient and moderate crystallinity, along with good miscibility with polymer donor D18. Its blend film presented an ideal fibrous network microstructure, ultimately achieving a PCE of 17.11%. Its blend film exhibited an ideal fibrous network morphology, with optimal charge transport and minimized charge recombination in the device. Consequently, the device based on D18:BTh-O-2 achieved a PCE of 17.11%. This achievement ranks among the highest efficiencies reported so far for OSCs based on NFREAs. This work elucidated the regulatory mechanism of side-chain oxygen positions on molecular crystallinity, providing important guidance for high-performance NFREAs design and synthesis.</p>

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Efficient organic solar cells enabled by alkoxy side-chain isomerization of non-fused ring electron acceptors

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Luyao Yang,
  • Bohan Shang,
  • Xiaolin Jiang,
  • Xinlu Bai,
  • Xing Yan,
  • Yetai Cheng,
  • Yixun Shu,
  • Weidong Wang,
  • Hao Lu,
  • Huawei Hu,
  • Xiaodong Wang,
  • Ya-Nan Chen,
  • Zhishan Bo,
  • Yahui Liu

摘要

Non-fused ring electron acceptors (NFREAs) feature simple synthetic procedures and remarkable cost-effectiveness, endowing them with great potential for pioneering applications in organic solar cell (OSC) commercialization. However, the rotation of C–C single bonds in these acceptors causes weak intermolecular interactions and low charge mobility, restricting further improvement of their power conversion efficiency (PCE). In this study, we designed and successfully synthesized three isomeric NFREAs. By regulating oxygen atom positions in side chains, we modulated intermolecular interactions, optimized thin-film morphology, and enhanced charge transport capability. Experimental results showed that molecular crystallinity gradually decreased with the outward shift of oxygen atoms. Among them, BTh-O-2 exhibited a higher molar extinction coefficient and moderate crystallinity, along with good miscibility with polymer donor D18. Its blend film presented an ideal fibrous network microstructure, ultimately achieving a PCE of 17.11%. Its blend film exhibited an ideal fibrous network morphology, with optimal charge transport and minimized charge recombination in the device. Consequently, the device based on D18:BTh-O-2 achieved a PCE of 17.11%. This achievement ranks among the highest efficiencies reported so far for OSCs based on NFREAs. This work elucidated the regulatory mechanism of side-chain oxygen positions on molecular crystallinity, providing important guidance for high-performance NFREAs design and synthesis.