Tatsuaki Nakanishi, Yasuhiro Shirai, Takeshi Yasuda and Liyuan Han Effect of branched alkyl chains attached at sp3 silicon of donor–acceptor copolymers on their morphology and photovoltaic properties Journal of Polymer Science Part A: Polymer Chemistry 50
The degree of π–π interactions is studied in two copolymers composed of 2-octylbenzotriazole and dialkyldithienosiloles with linear hexyl (P1) and branched 2-ethylhexyl groups (P2). Although the branched ethyl group can be positioned above the π-plane of dithienosilole to bring disadvantage to stacking among the polymers, the solid-state absorption spectra of the polymers reveal that P2 possesses stronger interchain interactions than P1. The photovoltaic properties of each polymer are evaluated with [6,6]-phenyl-C71-butyric acid methyl ester.
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