A polymer comprising: In this polymer R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are independently selected from H, F, Cl, S, CN, or substituted, unsubstituted, straight-chain, branched, or cyclic alkyls ranging from 1 to 100 carbon atoms. The length of the polymer can range with n from about 1 to about 100,000 repeat units.