Thiophene fluorination to enhance photovoltaic performance in low band gap donor–acceptor polymers
- 27 September 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Chemical Communications
- Vol. 48 (90) , 11130-11132
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.Keywords
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