Patent ID: 8558109

Claim:
A copolymer comprising a structure represented by: wherein R 1 and R 2 are independently selected from a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; Ar 1 and Ar 2 are independently a heteroaromatic group comprising about 4 to about 30 carbon atoms, and can be optionally substituted; a and b are each 1; Ar 3 and Ar 4 are independently selected from the group consisting of: which can be optionally substituted with an alkyl or halogen, wherein X is independently O, S or Se; Z is H or F; and R 3 is an alkyl or substituted alkyl group; c and e are each 1; d is 1 to 4 and the carbon-carbon double bond is in the E-configuration; and n represents a number from 2 to about 5,000.