Abstract
Two random terpolymers bearing alkoxy-benzodithiophene as an electron-rich unit and N-octylthieno[3,4,c]pyrrole-4,6-dione (TPD) as an electron deficient group with thiophene and selenophene π bridges, were synthesized and characterized. Electrochemical, optical properties of the polymers were analyzed to get an insight on the effect of different π bridges. Photovoltaic performances of the polymers were investigated with a conventional device architecture. PBTS, PBTSe based polymer solar cells (PSCs) exhibited power conversion efficiency of 3.32% and 3.19%. PCE of PBTS:PC71BM based PSCs were improved to 4.30% with the addition of 1% (vol/vol) 1,8-diiodooctane (DIO) as a solution processing additive. With the introduction of diphenyl ether (DPE) as the solvent additive, PBTSe based polymer solar cells attained 5.15% PCE value due to the formation of the interpenetrated network structure of domains.
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