富勒烯
有机太阳能电池
材料科学
能量转换效率
光伏系统
制作
纳米技术
化学
光电子学
有机化学
聚合物
医学
生态学
替代医学
病理
复合材料
生物
作者
Yuzhang Xiao,Qingling Nie,Qiang Guo,Yanfang Geng,Bo Xiao,Erjun Zhou
标识
DOI:10.1021/acs.jpcc.2c01093
摘要
In virtue of unique advantages of low cost, stability, and simple synthesis, the homopolymer poly(3-hexylthiophene) (P3HT) shows great potential in the field of organic photovoltaics (OPV) for large-area fabrication. Designing non-fullerene acceptors (NFAs) for P3HT has always been a hot topic of P3HT research, which has not yet met the power conversion efficiency (PCE) required for commercialization. Our group is the first to focus on A2-A1-D-A1-A2-type NFAs with benzotriazole (BTA) as the A1 unit used in the P3HT system and has contributed to the development of P3HT-based OPVs. Herein, we first introduce a DAD ladder-type fused core into the A2-A1-D-A1-A2-type NFAs and synthesize two A2-A1-DA1D-A1-A2-type NFAs (BTA91 and BTA93) with different end-capping A2 groups. With a red-shifted absorption spectrum and appropriate blend morphology, the P3HT:BTA93 device achieved an improved PCE of 5.46% compared to that of P3HT:BTA91 (2.03%). In summary, the fused central core in the A2-A1-DA1D-A1-A2-type NFAs would be a great promise for P3HT devices, and fine-tuning the structure remains key to improve the device performance since the crystallization behavior of P3HT blends is difficult to control completely.
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