Acceptor manipulation of bisalkylthiothienyl benzo[1,2-b:4,5-b']dithiophene core-structured oligomers for efficient organic photovoltaics

Benzo[1,2-b:4,5-b']dithiophene (BDT) core-structured small molecules with bisalkylthio side-group lowered HOMO levels showed the highest power conversion efficiency (PCE) of 5.17% in OSCs.230