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<p>Although near-infrared (NIR)-absorbing acceptors tend to capture more photons to boost the photocurrent (<i>J</i><sub>SC</sub>) of polymer solar cells (PSCs), they often suffer from significant energy loss (<i>E</i><sub>loss</sub>), resulting in a low photovoltage (<i>V</i><sub>OC</sub>), which limits further improvement of the power conversion efficiency (PCE). Herein, we developed four selenium-fused NIR-absorbing acceptors (Y-SeNF, Y-SeNF-2ClO, Y-SeBNF, and Y-SeBNF-2ClO) by regulating the molecular photoelectric properties <i>via</i> end-group and side-chain dual-engineering. Among them, Y-SeNF-2ClO with linear side-chains and asymmetric end-groups showed favorable molecular packing and energy levels, achieving an optimized active layer morphology and suppressed energy loss. Therefore, among the binary PSCs with a polymer donor D18, the Y-SeNF-2ClO device achieved the minimized <i>E</i><sub>loss</sub> and the highest product of <i>V</i><sub>OC</sub>×<i>J</i><sub>SC</sub>, leading to a champion PCE of 17.41%, outperforming other devices based on acceptors with branched side-chains and/or symmetric end-groups. Encouraged by the above success, NIR-absorbing Y-SeNF-2ClO was also introduced into the classic D18:L8-BO host system to fabricate efficient ternary PSCs. Notably, the D18:L8-BO:Y-SeNF-2ClO device offered a further improved PCE of 20.08%, ranking among the highest values reported for asymmetric acceptors. This work provides a feasible molecular design strategy for end-group and side-chain dual-engineering to develop NIR-absorbing acceptors for constructing efficient PSCs.</p>

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End-group and Side-chain Dual-engineering of Selenium-fused Acceptors for 20.08% Efficiency Polymer Solar Cells with Low Energy Loss

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Wen-Yan Su,
  • Hao-Yu Su,
  • Xu-Min Zhou,
  • Kai Xiang,
  • Chen-Yang Dong,
  • Teng-Fei Li,
  • Shu-Juan Liu,
  • Tao Sun,
  • Hong-Mei Qin,
  • Hai-Rui Bai,
  • Yu-Xiang Li,
  • Zi-Cheng Ding,
  • Chao Gao,
  • Hong-Xiang Li,
  • Qun-Ping Fan

摘要

Although near-infrared (NIR)-absorbing acceptors tend to capture more photons to boost the photocurrent (JSC) of polymer solar cells (PSCs), they often suffer from significant energy loss (Eloss), resulting in a low photovoltage (VOC), which limits further improvement of the power conversion efficiency (PCE). Herein, we developed four selenium-fused NIR-absorbing acceptors (Y-SeNF, Y-SeNF-2ClO, Y-SeBNF, and Y-SeBNF-2ClO) by regulating the molecular photoelectric properties via end-group and side-chain dual-engineering. Among them, Y-SeNF-2ClO with linear side-chains and asymmetric end-groups showed favorable molecular packing and energy levels, achieving an optimized active layer morphology and suppressed energy loss. Therefore, among the binary PSCs with a polymer donor D18, the Y-SeNF-2ClO device achieved the minimized Eloss and the highest product of VOC×JSC, leading to a champion PCE of 17.41%, outperforming other devices based on acceptors with branched side-chains and/or symmetric end-groups. Encouraged by the above success, NIR-absorbing Y-SeNF-2ClO was also introduced into the classic D18:L8-BO host system to fabricate efficient ternary PSCs. Notably, the D18:L8-BO:Y-SeNF-2ClO device offered a further improved PCE of 20.08%, ranking among the highest values reported for asymmetric acceptors. This work provides a feasible molecular design strategy for end-group and side-chain dual-engineering to develop NIR-absorbing acceptors for constructing efficient PSCs.