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Fused Dithienogermolodithiophene Low Band Gap Polymers for High-Performance Organic Solar Cells without Processing Additives

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Departments of Chemistry and Physics, Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, U.K.
Cite this: J. Am. Chem. Soc. 2013, 135, 6, 2040–2043
Publication Date (Web):January 25, 2013
Copyright © 2013 American Chemical Society

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    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.

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