Synthesis and Photovoltaic Properties of D–A Copolymers Based on Dithienosilole and Benzotriazole
Synthesis and Photovoltaic Properties of D–A Copolymers Based on Dithienosilole and Benzotriazole
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DOI：
10.1021/ma201673m
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发表时间：
2011-09
期刊：
影响因子：
5.5
通讯作者：
J. Min;Zhiguo Zhang;Siyuan Zhang;Maojie Zhang;Jing Zhang;Yongfang Li
中科院分区：
文献类型：
--
作者：
J. Min;Zhiguo Zhang;Siyuan Zhang;Maojie Zhang;Jing Zhang;Yongfang Li
合成了两种新型的含噻吩并噻咯（dithienosilole，BTA）给体和苯并三唑（benzotriazole，BTA）受体的无噻吩桥和含噻吩桥的给体-受体共聚物PDTS-BTA和PDTS-DTBTA，研究了它们在聚合物太阳能电池（polymer solar cell，PSC）中的结构与性能关系。与PDTS-BTA相比，在PDTS-DTBTA中添加噻吩桥改善了平面性并增加了聚合物主链的有效共轭，这转化为更宽和更强的吸收，更高的空穴迁移率和更好的光伏性能。在AM1.5G，100 mW/cm 2的光照下，基于PDTS-DTBTA/PC 70 BM的PSC的功率转换效率为3.80%，与相同实验条件下基于PDTS-BTA/PC 70 BM的PSC的功率转换效率（1.64%）相比，有了显著的提高。
Two new donor–acceptor (D–A) copolymers containing dithienosilole (DTS) donor unit and benzotriazole (BTA) acceptor unit without and with thiophene bridge, PDTS-BTA and PDTS-DTBTA, were synthesized to study their structure–property relationships for the application in polymer solar cells (PSCs). Compared to PDTS-BTA, adding thiophene bridges in PDTS-DTBTA improves planarity and increases effective conjugation of the polymer main chain, which translated into broader and stronger absorption, higher hole mobility, and better photovoltaic performance. Under the illumination of AM1.5G, 100 mW/cm2, the PSC based on PDTS-DTBTA/PC70BM demonstrated a power conversion efficiency of 3.80%, which is significantly improved in comparison with that (1.64%) of the device based on PDTS-BTA/PC70BM under the same experimental conditions.