Patent ID: 8399605

Claim:
A semiconductive polymer comprising a first repeat unit in the polymer backbone comprising general formula I and a co-repeat unit comprising an aryl group or a heteroaryl group: where a=1 or 2; b=0 such that Ar 4 is not present; and c=1 or 2; Ar 1 , Ar 3 , Ar 5 , and Ar 6 each independently represent an aryl or heteroaryl ring or a fused derivative thereof; Ar 2 represents a 6-membered aryl or heteroaryl ring or a fused derivative thereof; provided that (a) when a=1, Ar 1 is not linked to Ar 2 by a direct bond, (b) when c=1, Ar 2 is not linked to Ar 5 by a direct bond, (c) when a=2, the Ar 1 groups are not linked by a single bond, and (d) when c=2, the Ar 5 groups are not linked by a single bond, wherein at least one of Ar 1 , Ar 2 , and Ar 5 is non-conjugating along the polymer backbone.