材料科学
堆积
有机太阳能电池
能量转换效率
激子
接受者
电子受体
电子迁移率
卤化
纳米纤维
戒指(化学)
离解(化学)
电子
纳米技术
光化学
光电子学
有机化学
聚合物
化学
物理
量子力学
复合材料
凝聚态物理
作者
Cui-Hong Li,Huarui Zhang,Xinyue Cui,Yanan Chen,Nan Wu,Guangliu Ran,Hao Lü,Shenhua Chen,Wenkai Zhang,Cui-Hong Li,Yahui Liu,Yuan Liu,Zhishan Bo
标识
DOI:10.1002/adma.202310362
摘要
Three nonfused ring electron acceptors (NFREAs), namely, 3TT-C2-F, 3TT-C2-Cl, and 3TT-C2, are purposefully designed and synthesized with the concept of halogenation. The incorporation of F or/and Cl atoms into the molecular structure (3TT-C2-F and 3TT-C2-Cl) enhances the π-π stacking, improves electron mobility, and regulates the nanofiber morphology of blend films, thus facilitating the exciton dissociation and charge transport. In particular, blend films based on D18:3TT-C2-F demonstrate a high charge mobility, an extended exciton diffusion distance, and a well-formed nanofiber network. These factors contribute to devices with a remarkable power conversion efficiency of 17.19%, surpassing that of 3TT-C2-Cl (16.17%) and 3TT-C2 (15.42%). To the best of knowledge, this represents the highest efficiency achieved in NFREA-based devices up to now. These results highlight the potential of halogenation in NFREAs as a promising approach to enhance the performance of organic solar cells.
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