Selection of side groups on simple non‐fullerene acceptors for the application in organic solar cells: From flexible to rigid
Selection of side groups on simple non‐fullerene acceptors for the application in organic solar cells: From flexible to rigid
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用于有机太阳能电池应用的简单非富勒烯受体侧基的选择：从柔性到刚性
DOI：
10.1002/pol.20210947
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发表时间：
2022-02
影响因子：
3.4
通讯作者：
Hongzheng Chen
中科院分区：
文献类型：
--
作者：
Shounuan Ye;Shuaishuai Chen;Xiangjun Zheng;Shuixing Li;Youwen Pan;Yiyao Chen;Jin Fang;Changqi Ma;Dan Wang;Qisheng Zhang;Minmin Shi;Hongzheng Chen
The side chains on non‐fullerene acceptors (NFAs) can affect greatly the photovoltaic performances of the resulting organic solar cells (OSCs) by regulating the molecular packing and orientation of NFAs. To explore suitable side groups for asymmetric simple NFAs, in this work, we design and synthesize two A‐D1‐A′‐D2‐A type NFAs, NTC‐4Cl, and PhNTC‐4Cl, which own flexible alkyloxy and rigid aryloxy side chains on the A′ cores, respectively. Due to the same molecular backbone (A′: benzotriazole; D1: thiophene; D2: cyclopentadithiophene; A: dichlorodicyanoindanone), NTC‐4Cl and PhNTC‐4Cl have similar absorptions and energy levels. However, the PhNTC‐4Cl‐based OSC gives a higher power conversion efficiency than that of the NTC‐4Cl‐based one (11.09% vs. 10.82%) because PhNTC‐4Cl shows more compact π–π stacking and dominant face‐on orientation, enhancing charge transport and mitigating charge recombination. Therefore, this work provides a new insight into the molecular design of high‐performance NFAs, especially the rational choice of side groups on asymmetric simple NFAs.
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