Side Chain Engineering of Polythiophene Derivatives with a Thienylene–Vinylene Conjugated Side Chain for Application in Polymer Solar Cells
作者:Zhi−Guo Zhang、Siyuan Zhang、Jie Min、Chaohua Cui、Hua Geng、Zhigang Shuai、Yongfang Li
DOI:10.1021/ma2026463
日期:2012.3.13
side-chain isolated polythiophene derivatives, PT4TV and PT4TV-C, were designed and synthesized by copolymerization of thiophene unit with thienylene–vinylene (TV) conjugated side chain and unsubstituted terthiophene unit. The difference of the two polymers is an additional carbonyl group on the conjugated TV side chain in PT4TV-C. Compared to previous reported conjugated side chain polythiophenes (CSC-PTs)
设计并合成了两个新的共轭侧链分离的聚噻吩衍生物PT4TV和PT4TV-C,它们是通过噻吩单元与噻吩-乙烯基(TV)共轭侧链和未取代的三噻吩单元的共聚而合成的。两种聚合物的区别是PT4TV-C中共轭TV侧链上有一个额外的羰基。与以前报道的具有浓缩侧链的共轭侧链聚噻吩(CSC-PTs)相比,PT4TV和PT4TV – C表现出聚合物主链的红移和增强的π–π *跃迁吸收以及肩峰和陡峭的吸收边缘,表明有序的聚合物主链和堆积良好的侧链。PT4TV的吸收边缘为663 nm,其HOMO能级为-5.21 eV。在PT4TV – C中引入电子不足的羰基导致在-5.26 eV处出现17 nm的红移吸收和HOMO能级下移,但引起了聚合物主链平面性较差的问题。PT4TV中更有序的结构转化为更好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PT4TV作为施主和茚-C 60双加合物作为受主的聚合物太阳能电池在3