A semiconducting compound comprising the structure: where R1 to R4 independently comprise, but are not limited to, optionally substituted straight, branched or cyclic alkyl chains having 2 to 20 (e.g. 2 to 12) carbon atoms, alkoxy, amino, amido, silyl, alkyl, alkenyl, aryl or hetero aryl; where X1 and X2 independently comprise S, O, NR5 or SiR6R7 where R8 to R7 independently comprise C1 to C5 branched, straight or cyclic alkyl chains; and where Ar1 comprises a heterocyclic ring, and where n is an integer between 1 and 4.