Novel wide-bandgap copolymer bearing alkylthio-thiophene-substituted benzodithiophene and methyl thiophene-3-carboxylate for highly stable fullerene-free simple polymer solar cells

We synthesized a novel wide bandgap copolymer, 3MT-Th-S which showed complementary absorption behavior with ITIC as an acceptor. Fullerene-free polymer solar cells with as-cast blend film exhibited high PCE of 7.86% with high Voc of 0.96 V and Jsc of 16.11 mA cm−2.205