Patent ID: 8445894

Claim:
A thin film transistor comprising at least three terminals consisting of a gate electrode, a source electrode and a drain electrode; an insulator layer and an organic semiconductor layer on a substrate, which controls an electric current flowing between the source and the drain by applying an electric voltage across the gate electrode, wherein the organic semiconductor layer comprises a styryl compound represented by formula (a): wherein R 1 , R 2 , R 4 , R 5 , R 14 , R 15 , R 17 , and R 18 each independently represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms; R 3 and R 16 represent the same groups and are an alkyl group having 1 to 4 carbon atoms; R 6 to R 13 each independently represents a hydrogen atom; R 19 to R 22 each independently represents a hydrogen atom; and l, m, and n each represents an integer of 0 or 1; and a sum of l+m+n makes an integer of 1.