Achieving 20% Efficiency in Organic Solar Cells Through Conformationally Locked Solid Additives

作者：Siying Wang, Sixuan Wang, Jiarui Wang, Na Yu, Jiawei Qiao, Xianqiang Xie, Congqi Li, Misbah Sehar Abbasi, Ruxue Ding, Xin Zhang, Yinghui Han, Guanghao Lu, Jianqi Zhang, Xiaotao Hao, Zheng Tang, Yunhao Cai, Hui Huang · 发表于：Advanced Energy Materials · 年份：2025 · DOI：10.1002/aenm.202405205 · 被引用次数：87 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Perovskite Materials and Applications

Abstract Volatile solid additives (VSAs) have emerged as one of the most effective strategies for optimizing the active layer morphology of organic solar cells (OSCs). In this study, two VSAs, HBT‐1 and HBT‐2, are designed and synthesized to investigate the effect of the VASs’ conformation on the photovoltaic performances. Compared to HBT‐1, HBT‐2 incorporates internal noncovalent conformational locks (NoCLs), resulting in reduced conformational disorder, improved molecular planarity, and enhanced crystallinity. These features significantly influence the intermolecular packing of both donor and acceptor materials in the active layer, which can facilitate charge transport and reduce charge recombination. Consequently, the D18:L8‐BO:PY‐C11 OSCs utilizing the HBT‐2 additive achieved an impressive efficiency of 20.01%, markedly higher than devices fabricated without additives (17.83%) and those processed with HBT‐1 (18.76%). Furthermore, HBT‐2 demonstrated excellent compatibility across multiple systems. This work underscores the NoCL strategy as a straightforward and effective approach for designing VSAs for high performance OSCs.