Influence of different copolymer sequences in low band gap polymers on their performance in organic solar cells

Alexander Lange, Hartmut Krueger, Bernhard Ecker, Ali Veysel Tunc, Elizabeth von Hauff, Mauro Morana

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The chemical design of a polymer can be tailored by a random or a block sequence of the comonomers in order to influence the properties of the final material. In this work, two sequences, PCPDTBT and F8BT (F8), were polymerized to form a block or a random copolymer. Differences between the various polymers were examined by exploring the surface topography and charge carrier mobility. A distinct surface texture and a higher charge carrier mobility was found for the block copolymer with respect to the other materials. Solar cells were prepared with polymer:PC71BM blend active layers and the best performance of up to 2% was found for the block copolymer, which was a direct result of the fill factor. Overall, the sequences of different copolymers for solar cell applications were varied and a positive impact on efficiency was found when the block copolymer structure was utilized. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
Original languageEnglish
Pages (from-to)1622-1635
JournalJOURNAL OF POLYMER SCIENCE PART A. POLYMER CHEMISTRY
Volume50
Issue number8
DOIs
Publication statusPublished - 15 Apr 2012

Keywords

  • diblock copolymers
  • morphology
  • organic solar cells
  • phase behavior
  • random copolymers

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