表面改性
有机太阳能电池
氟
分子间力
侧链
材料科学
三元运算
能量转换效率
化学物理
聚合物太阳能电池
化学
化学工程
物理化学
光电子学
有机化学
分子
聚合物
工程类
复合材料
程序设计语言
冶金
计算机科学
作者
Huawei Hu,Shuai Liu,Jiaoyu Xu,Ruijie Ma,Zhengxing Peng,Top Archie Dela Peña,Yongjie Cui,Wenting Liang,Xiaoli Zhou,Siwei Luo,Han Yu,Mingjie Li,Jiaying Wu,Shangshang Chen,Gang Li,Yiwang Chen
标识
DOI:10.1002/anie.202400086
摘要
Abstract Fluorine side chain functionalization of non‐fullerene acceptors (NFAs) represents an effective strategy for enhancing the performance of organic solar cells (OSCs). However, a knowledge gap persists regarding the relationship between structural changes induced by fluorine functionalization and the resultant impact on device performance. In this work, varying amounts of fluorine atoms were introduced into the outer side chains of Y‐series NFAs to construct two acceptors named BTP‐F0 and BTP‐F5. Theoretical and experimental investigations reveal that side‐chain fluorination significantly increase the overall average electrostatic potential (ESP) and charge balance factor, thereby effectively improving the ESP‐induced intermolecular electrostatic interaction, and thus precisely tuning the molecular packing and bulk‐heterojunction morphology. Therefore, the BTP‐F5‐based OSC exhibited enhanced crystallinity, domain purity, reduced domain spacing, and optimized phase distribution in the vertical direction. This facilitates exciton diffusion, suppresses charge recombination, and improves charge extraction. Consequently, the promising power conversion efficiency (PCE) of 17.3 % and 19.2 % were achieved in BTP‐F5‐based binary and ternary devices, respectively, surpassing the PCE of 16.1 % for BTP‐F0‐based OSCs. This work establishes a structure‐performance relationship and demonstrates that fluorine functionalization of the outer side chains of Y‐series NFAs is a compelling strategy for achieving ideal phase separation for highly efficient OSCs.
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