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

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:PC(71)BM blends afforded efficiencies up to 7.2% without the need for thermal annealing or processing additives.

DOI: 10.1021/ja311700u

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Cite this paper

@article{Zhong2013FusedDL, title={Fused dithienogermolodithiophene low band gap polymers for high-performance organic solar cells without processing additives.}, author={Hongliang Zhong and Zhe Li and Florent Deledalle and Elisa Collado Fregoso and Munazza Shahid and Zhuping Fei and Christian Benedikt Orea Nielsen and Nir Yaacobi-Gross and Stephan Rossbauer and Thomas D Anthopoulos and James R Durrant and Martin Heeney}, journal={Journal of the American Chemical Society}, year={2013}, volume={135 6}, pages={2040-3} }