Abstract

Two conjugated polymers (PuIDTBD and PuIDTQ) with unsymmetric side chains have been prepared for polymer solar cells using two other polymers (PIDTBD and PIDTQ) with symmetric side chains as control compounds. The combination of methyl and 4-hexylphenyl side chains on the same bridged carbon can ensure good solubility, decrease π-π stacking distances, and bring proper miscibility with PC₇₁BM simultaneously. Therefore, the corresponding polymer solar cells (PSCs) based on donor polymers with unsymmetric side chains exhibited enhanced short-circuit current density (J_SC) and power conversion efficiency (PCE) compared with those of control polymers. The PIDTBD and PIDTQ based devices possessed low PCE of 2.13% and 1.48%, while PCEs of devices based on PuIDTBD and PuIDTQ were improved to 3.93% and 4.12%, respectively. The results demonstrate that unsymmetric side chain engineering of conjugated polymers is an effective approach to achieve high performance PSCs.

中文翻译：

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茚并二噻吩共聚物的不对称侧链可改善包装和装置性能

摘要

已经使用两种其他具有对称侧链的聚合物（PIDTBD和PIDTQ）作为控制化合物，制备了具有不对称侧链的两种共轭聚合物（PuIDTBD和PuIDTQ）用于聚合物太阳能电池。同一桥碳上甲基和4-己基苯基侧链的结合可确保良好的溶解性，减少π - π的堆积距离，并同时与PC ₇₁ BM产生适当的混溶性。因此，基于具有不对称侧链的施主聚合物的相应聚合物太阳能电池（PSC）表现出增强的短路电流密度（J _SC）和功率转换效率（PCE）与对照聚合物相比。基于PIDTBD和PIDTQ的设备的PCE较低，分别为2.13％和1.48％，而基于PuIDTBD和PuIDTQ的设备的PCE分别提高至3.93％和4.12％。结果表明，共轭聚合物的不对称侧链工程化是实现高性能PSC的有效方法。