Abstract
Two thieno[3,4-c]pyrrole-4,6-dione (TPD)-based copolymers, poly[5,10-bis(2-ethylhexyloxy) naphtho[1,2-b:5,6-b’]dithiophene-2,7-diyl-alt-1,3-(5-heptadecan-9-yl)-4H-thieno[3,4-c]pyrrole-4,6-dione] (P1) and poly[4,9-bis(2-ethylhexyloxy)naphtho[1,2-b:5,6-b’]dithiophene-2,7-diyl-alt-1,3-(5-heptadecan-9-yl)-4H-thieno[3,4-c]pyrrole-4,6-dione] (P2), were synthesized and used as donor materials in polymer solar cells (PSCs). The optical, electrochemical, and photovoltaic properties of the copolymers were investigated. Under optimized conditions, the TPD-based polymers showed power conversion efficiencies (PCEs) for the PSCs in the range from 1.1 to 2.1% under AM 1.5 illumination (100 mW/cm2).
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