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<p>Developing low-cost active layer systems that offer both high performance and non-halogenated solvent processing is a critical step towards the commercialization of organic solar cells (OSCs). Herein, we design and synthesize a fully non-fused ring electron acceptor (NFREA), DTBM22, with a material-only cost of 12.0 $ g<sup>−1</sup> and well-ordered molecular stacking. The non-halogenated solvent processed DTBM22-based OSCs achieve a PCE of 13.5%. Interestingly, DTBM22 forms an alloy-like phase when blended with the low-cost fully NFREA DTB22. Compared to pristine DTB22 films, the blend improves the exciton diffusion length from 25.7 to 30.2 nm and reduces the exciton dissociation energy barrier from 10.4 to 6.7 meV. When OSCs are fabricated using a non-halogenated solvent, the control DTB22-based OSC delivers a good PCE of 16.9%, while the DTBM22:DTB22-based OSC achieves an outstanding PCE of 18.0%, which is the highest PCE value reported to date for both NFREA-based and fully NFREA-based OSCs processed using non-halogenated solvents. This study offers a new insight into developing high-performance, low-cost, non-halogenated solvent-processed OSCs.</p>

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18% Efficiency in fully non-fused ring acceptor solar cells via an alloy-like strategy

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Kun Li,
  • Xuefeng Liu,
  • Cunbin An,
  • Jianbin Zhong,
  • Chuangcheng Hong,
  • Yuan Yao,
  • Yu Chen,
  • Wei Zhang,
  • Yishi Wu,
  • Qing Liao,
  • Hongbing Fu

摘要

Developing low-cost active layer systems that offer both high performance and non-halogenated solvent processing is a critical step towards the commercialization of organic solar cells (OSCs). Herein, we design and synthesize a fully non-fused ring electron acceptor (NFREA), DTBM22, with a material-only cost of 12.0 $ g−1 and well-ordered molecular stacking. The non-halogenated solvent processed DTBM22-based OSCs achieve a PCE of 13.5%. Interestingly, DTBM22 forms an alloy-like phase when blended with the low-cost fully NFREA DTB22. Compared to pristine DTB22 films, the blend improves the exciton diffusion length from 25.7 to 30.2 nm and reduces the exciton dissociation energy barrier from 10.4 to 6.7 meV. When OSCs are fabricated using a non-halogenated solvent, the control DTB22-based OSC delivers a good PCE of 16.9%, while the DTBM22:DTB22-based OSC achieves an outstanding PCE of 18.0%, which is the highest PCE value reported to date for both NFREA-based and fully NFREA-based OSCs processed using non-halogenated solvents. This study offers a new insight into developing high-performance, low-cost, non-halogenated solvent-processed OSCs.