近日，西安交通大学凡群平团队揭示卤化二苯基醚溶剂添加剂使有机太阳能电池和高性能不透明/半透明组件的效率达到20%。相关论文发表在2025年8月21日出版的《国家科学评论》杂志上。

溶剂添加剂被认为是优化有机太阳能电池（OSCs）形态以提高功率转换效率（PCE）的通用工具。为了优化活性层（PM6:L8-BO）的形貌，研究组开发了三种卤化二苯基醚（DPE）溶剂添加剂（氟化DPE-F、氯化DPE-Cl和溴化DPE-Br）。随着卤素原子量的增加，三种添加剂的沸点逐渐升高，而DPE-Cl和DPE-Br的偶极矩与DPE-F相似，但高得多。DPE-Br较高的沸点和偶极矩有望在活性层成膜过程中增强添加剂与L8-BO之间的非共价相互作用，从而改善分子间的堆积、电荷传输、激子解离和电荷收集。

因此，经过DPE-Br处理的有机太阳能电池（OSC）获得了18.40%的光电转换效率（PCE），优于经DPE-F（17.73%）和DPE-Cl（18.03%）处理的器件。值得注意的是，当使用D18作为给体材料时，基于DPE-Br处理的D18:L8-BO:BTP-eC9体系进一步实现了约20%的PCE提升。其11.6 cm²不透明组件和半透明组件还分别实现了16.42%和10.50%的高效率，该数值位居有机太阳能电池及其不透明/半透明组件性能排行榜前列。这项工作强调了在DPE衍生添加剂中的卤化是一种有前景的策略，以优化形貌，以获得高效的OSCs和模块。

附：英文原文

Title: Halogenated diphenyl ether solvent additives enable ～20% efficiency organic solar cells and high-performance opaque/semitransparent modules

Author: Zhou, Yibo, Su, Wenyan, Liang, Zezhou, Wu, Qiang, Bai, Hairui, Liu, Han, Song, Bohao, Li, Xiong, Xie, Bomin, Liu, Chang, Zhang, Yuchan, Wang, Yu, Cao, Jiamin, Liao, Xunfan, Lu, Guanghao, Liu, Yuhang, Ma, Ruijie, Du, Huiling, Ma, Wei, Fan, Qunping

Issue&Volume: 2025-08-21

Abstract: Solvent additives are considered as the versatile tools to optimize morphology for boosting power conversion efficiency (PCE) of organic solar cells (OSCs). Here, three halogenated diphenyl ether (DPE) solvent additives (fluorinated DPE-F, chlorinated DPE-Cl, and brominated DPE-Br) are developed to optimize active layer (PM6:L8-BO) morphology. With the halogen atomic weight increases, three additives show gradually increasing boiling-point, while DPE-Cl and DPE-Br have similar but much higher dipole moment compared to DPE-F. The higher boiling-point and dipole moment of DPE-Br are expected to enhance the non-covalent interaction between additive and L8-BO during the active layer film-forming process, offering the improved intermolecular packing, charge transport, exciton dissociation, and charge collection. As a result, the DPE-Br-treated OSC achieves a higher PCE (18.40%) compared to the DPE-F and DPE-Cl-treated ones (17.73% and 18.03%). Impressively, using D18 as donor, the OSCs based on DPE-Br-processed D18:L8-BO:BTP-eC9 obtain a further boosted PCE of ～20%, while their 11.6 cm2 opaque and semitransparent modules also achieve high PCEs of 16.42% and 10.50%, respectively, which are among the top values in OSCs and opaque/semitransparent modules. This work highlights that the halogenation in DPE derived additives is a promising strategy to optimize morphology for obtaining efficient OSCs and modules.

DOI: 10.1093/nsr/nwaf346

Source: https://dx.doi.org/10.1093/nsr/nwaf346