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Keywords:

  • π–π stacking;
  • branch effect;
  • conjugated polymers;
  • organic photovoltaics;
  • side chain at sp3 element

Abstract

We study the degree of π−π interactions 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 stack among the polymers, the solid-state absorption spectra of the polymers reveal that P2 possesses stronger interchain interactions than P1. We also evaluate the photovoltaic properties of each polymer with [6,6]-phenyl-C71-butyric acid methyl ester. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012