An organic photovoltaic device comprising a polymer:




and an acceptor. In this organic photovoltaic device, R1, R2, R3, R4, R5 and R6 are independently selected from the group consisting of: a halogen, a substituted alkyl, an unsubstituted alkyl, a substituted aryl, an unsubstituted aryl, a substituted heteroaryl and an unsubstituted heteroaryl.