合成了两种以三苯胺为核的星形齐聚噻吩衍生物,三[4-(2-噻吩)苯]胺(TTPA)和三[4-(5'-氰基-2 '-噻吩)苯]胺(TCTPA),应用紫外-可见吸收光谱、荧光光谱和循环伏安法研究了它们的光物理和电化学性能,计算了它们的HOMO、LUMO能级和电化学带隙,并讨论了分子结构与光电性能之间的关系.研究结果表明,TCTPA中氰基的引入使最大吸收峰和发射峰与TTPA相比均发生了红移,TCTPA的起始氧化电位和还原电位均向阳极移动.分别以TTPA和TCTPA为电子给体材料,3,4,9,10-二萘嵌苯四甲酸二酐(PTCDA)为电子受体材料,采用真空蒸镀方法制备了两种p-n异质结有机光伏器件:(a) ITO/TTPA/PTCDA/Al和(b)ITO/TCTPA/PTCDA/Al,研究了它们的光伏性能.两种器件的光电转换效率分别为0.55％和1.28％,TCTPA结构中引入氰基后使其光伏性能显著提高.原子力显微镜观察膜表面形态发现,TCTPA具有更好的有序性,更易发生取向,这可能是其光伏性能较好的主要原因.
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