Fused dithienogermolodithiophene low band gap polymers for high-performance organic solar cells without processing additives.
نویسندگان
چکیده
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.
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ورودعنوان ژورنال:
- Journal of the American Chemical Society
دوره 135 6 شماره
صفحات -
تاریخ انتشار 2013