Thiophene fluorination to enhance photovoltaic performance in low band gap donor–acceptor polymers

Zhuping Fei, Munazza Shahid, Nir Yaacobi-Gross, Stephan Rossbauer, Hongliang Zhong, Scott E. Watkins, Thomas D. Anthopoulos, Martin Heeney

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

We report the first synthesis of a tetrafluorinated 4,7-bis(3,4-difluorothiophen-2-yl)-2,1,3-benzothiadiazole monomer and its polymerisation with dithieno[3,2-b:2′,3′-d]germole by Stille coupling to afford a low band gap polymer with a high ionisation potential. Direct comparison to the non-fluorinated analogue demonstrates that fluorination results in an increase in ionisation potential with no change in optical band gap, and enhanced aggregation over the non-fluorinated polymer. These desirable properties result in a significant enhancement in OPV device performance in blends with PC71BM. © 2012 The Royal Society of Chemistry.
Original languageEnglish (US)
Pages (from-to)11130-11132
Number of pages3
JournalChemical Communications
Volume48
Issue number90
DOIs
StatePublished - Oct 17 2012
Externally publishedYes

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