Low band gap dithienogermolodithiophene copolymers with tunable acceptors and side-chains for organic solar cells

Hongliang Zhong, Zhe Li, Ester Buchaca-Domingo, Stephan Rossbauer, Scott E. Watkins, Natalie Stingelin, Thomas Anthopoulos, Martin Heeney*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

We report the synthesis and characterisation of five new donor-acceptor type co-polymers based on a fused dithienogermolodithiophene unit for use in photovoltaic devices. The influence of three electron deficient co-monomers, as well as the length and variety of the solubilising side-chains, on the physical and optoelectronic properties of the polymers is reported. The number and variety of alkyl side-chains is found to have a significant impact on the polymer aggregation and film morphology, with larger and more bulky side-chains leading to improved solubility and molecular weight. The influence of these properties upon the performance of bulk heterojunction solar cells is shown.

Original languageEnglish (US)
Pages (from-to)14973-14981
Number of pages9
JournalJournal of Materials Chemistry A
Volume1
Issue number47
DOIs
StatePublished - Dec 21 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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