An alkylthieno-2-yl flanked dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene-based low band gap conjugated polymer for high performance photovoltaic solar cells

A conjugated polymer from 5,10-dialkylthieno-2-yl-dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene and naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole derivative, was synthesized, and inverted polymer solar cells with a power conversion efficiency of 7.52% was achieved.