有机太阳能电池
位阻效应
接受者
单体
取代基
材料科学
光化学
化学
聚合物
立体化学
有机化学
物理
凝聚态物理
作者
Xinyuan Jia,Yu Li,Xiangjian Cao,Xingqi Bi,Wenkai Zhao,Zhaoyang Yao,Guankui Long,Bin Kan,Yaxiao Guo,Chenxi Li,Xiangjian Wan,Yongsheng Chen
出处
期刊:Small
[Wiley]
日期:2024-09-03
标识
DOI:10.1002/smll.202405925
摘要
Abstract Dimeric acceptors are expected to satisfy both excellent power conversion efficiency (PCE) and operational stability of organic solar cells (OSCs). However, comparing to highly planar and symmetrical monomer‐like acceptors, the quite different steric/spatial configurations of dimeric acceptors affect device outcomes greatly. Herein, on basis of the same dimeric molecular platform that constructed by bridging central units of two monomer‐like acceptor, diverse substituents (─OCH 3 for D1, ─CH 3 for D2, and ─CF 3 for D3) are grafted on central units to regulate the three dimensions (3D) geometries of dimeric acceptors delicately. A systematic investigation reveals the substituent‐dependent variation of energy level, absorption, and molecular packing behavior. Consequently, D2 acceptor, characteristic of more favorable configuration, affords a superior film morphology and charge transfer/transport dynamics in resulting OSCs, thus yielding an excellent PCE of 17.50% along with a good long‐term stability. This work manifests the crucially important role of central substituents in constructing high‐performance dimeric acceptors.
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