Fused dithienogermolodithiophene low band gap polymers for high-performance organic solar cells without processing additives

Hongliang Zhong, Zhe Li, Florent Deledalle, Elisa Collado Fregoso, Munazza Shahid, Zhuping Fei, Christian B. Nielsen, Nir Yaacobi-Gross, Stephan Rossbauer, Thomas D. Anthopoulos, James R. Durrant*, Martin Heeney

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

132 Scopus citations

Abstract

We report the synthesis of a novel ladder-type fused ring donor, dithienogermolodithiophene, in which two thieno[3,2-b]thiophene units are held coplanar by a bridging dialkyl germanium. Polymerization of this extended monomer with N-octylthienopyrrolodione by Stille polycondensation afforded a polymer, pDTTG-TPD, with an optical band gap of 1.75 eV combined with a high ionization potential. Bulk heterojunction solar cells based upon pDTTG-TPD:PC71BM blends afforded efficiencies up to 7.2% without the need for thermal annealing or processing additives.

Original languageEnglish (US)
Pages (from-to)2040-2043
Number of pages4
JournalJournal of the American Chemical Society
Volume135
Issue number6
DOIs
StatePublished - Feb 13 2013

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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