Abstract
Three new donor–acceptor (D–A) type of conjugated polymers, with 1,1-diheptyl-3,4-diphenyl-2,5-bis(4,7-dithienyl-2,1,3-benzothiadiazole)-silole as acceptor unit, were synthesized through palladium-catalyzed Stille polymerization. The resulting polymers exhibit a broad absorption in the range from 350 to 850nm and have excellent thermal stability with decomposition temperature up to 400°C. The HOMO energy levels of the polymers determined from CV are lower than −5.1eV, so these polymers are promising donor materials for polymer solar cells (PSCs). Bulk-heterojunction (BHJ) PSCs based on an inverted device configuration of ITO/PFN/PDTBDT-HSTBT:PC61BM/MoO3/Ag showed good photovoltaic performance with power conversion efficiency of 3.24%.
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