Patent ID: 8502199

Claim:
A semiconductive conjugated polymer comprising a first repeat unit comprising general formula I: wherein Ar 1 , Ar 3 , and Ar 5 are the same or different and each represents an optionally substituted aryl or heteroaryl group; each of Ar 2 and Ar 4 comprises a group having formula II: wherein Ar represents a 6-membered aryl or heteroaryl group; and X comprises a group having formula III: wherein Ar 6 represents a 6-membered aryl or heteroaryl group and Ar 7 and Ar 8 are the same and each represents an aryl or heteroaryl group located at the meta position; wherein Ar 2 and Ar 4 sterically interact with one another so as to cause an increase in the bandgap of the polymer relative to a corresponding polymer wherein Ar 2 and Ar 4 do not sterically interact with one another; and wherein both Ar 2 and Ar 4 have a molecular weight of greater than 300.