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<p>The bulk heterojunction (BHJ) configuration has immensely boosted the power conversion efficiencies (PCEs) of organic solar cells (OSCs). Nevertheless, precise control over donor/acceptor microstructures within BHJ films remains challenging, due to their intertwined self-assembly process during solution casting, thus limiting device performance. Herein, we report a dual-additive targeted engineering strategy to synergistically regulate the donor and acceptor aggregation structures in BHJ blends via introducing two types of additives with distinct characteristics. Specifically, it is found that the solid additive featuring twisted bulky groups (<i>e.g.</i>, DBM) can effectively decelerate crystallization kinetics of the polymer donors, thus alleviating their over-aggregation and promoting molecular ordering. Distinctively, the solvent additive with linear or co-planar configurations (<i>e.g.</i>, DIO or 1-CN) can induce enhanced pre-aggregation and also more ordered packing of the small molecule acceptors via their special intermolecular interactions. Intriguingly, these two different types of additives can operate collaboratively rather than interfering with each other. Ultimately, the PM6:L8-BO-based OSC processed with DIO+DBM achieves a notable PCE of 20.1% with superior photostability. The universality of this strategy is validated across various blend systems. In D18:L8-BO:BTP-S10 system, a champion PCE of 20.9% (certified as 20.6%) is attained. This study provides an effective pathway for dual-phase morphological modulation toward high-performance OSCs.</p>

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Achieving 20.9% efficiency organic solar cell enabled by a dual-additive targeted engineering

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Bo Cheng,
  • Xinxin Xia,
  • Zhen Fu,
  • Dongcheng Jiang,
  • Chenyu Han,
  • Yumiao Huo,
  • Feng Hua,
  • Hao Wang,
  • Sixuan Cheng,
  • Fengbo Sun,
  • Kangning Zhang,
  • Xia Guo,
  • Hang Yin,
  • Xiaoyan Du,
  • Xiaotao Hao,
  • Yongfang Li,
  • Maojie Zhang

摘要

The bulk heterojunction (BHJ) configuration has immensely boosted the power conversion efficiencies (PCEs) of organic solar cells (OSCs). Nevertheless, precise control over donor/acceptor microstructures within BHJ films remains challenging, due to their intertwined self-assembly process during solution casting, thus limiting device performance. Herein, we report a dual-additive targeted engineering strategy to synergistically regulate the donor and acceptor aggregation structures in BHJ blends via introducing two types of additives with distinct characteristics. Specifically, it is found that the solid additive featuring twisted bulky groups (e.g., DBM) can effectively decelerate crystallization kinetics of the polymer donors, thus alleviating their over-aggregation and promoting molecular ordering. Distinctively, the solvent additive with linear or co-planar configurations (e.g., DIO or 1-CN) can induce enhanced pre-aggregation and also more ordered packing of the small molecule acceptors via their special intermolecular interactions. Intriguingly, these two different types of additives can operate collaboratively rather than interfering with each other. Ultimately, the PM6:L8-BO-based OSC processed with DIO+DBM achieves a notable PCE of 20.1% with superior photostability. The universality of this strategy is validated across various blend systems. In D18:L8-BO:BTP-S10 system, a champion PCE of 20.9% (certified as 20.6%) is attained. This study provides an effective pathway for dual-phase morphological modulation toward high-performance OSCs.