Patent ID: 7714319

Claim:
An organic thin film transistor comprising: at least three terminals comprising a gate electrode, a source electrode and a drain electrode; and an insulating layer and an organic semiconductor layer on a substrate, which controls an electric current flowing between the source electrode and the drain electrode by applying an electric voltage across the gate electrode, a distance between the source electrode and the drain electrode being 1 μm to 1 mm; wherein the organic semiconductor layer comprises a heterocyclic compound containing a nitrogen atom expressed by formula (II): wherein R 21 and R 22 each independently represents a hydrogen atom or a substituent; and Z 2 represents an atomic group forming a five-member ring or a six-member ring; wherein the substituents represented by R 21 and R 22 are each independently selected from the group consisting of an alkyl group having 1 to 40 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkynyl group having 2 to 8 carbon atoms, an aryl group having 6 to 40 carbon atoms, an amino group having 0 to 6 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, an aryloxy group having 6 to 12 carbon atoms, an acyl group having 1 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 12 carbon atoms, an aryloxycarbonyl group having 7 to 10 carbon atoms, an acyloxy group having 2 to 10 carbon atoms, an acylamino group having 2 to 10 carbon atoms, an alkoxycarbonylamino group having 2 to 12 carbon atoms, an aryloxycarbonyl-amino group having 7 to 12 carbon atoms, a sulfonylamino group having 1 to 12 carbon atoms, a sulfamoyl group having 0 to 12 carbon atoms, a carbamoyl group having 1 to 12 carbon atoms, an alkylthio group having 1 to 12 carbon atoms, an arylthio group having 6 to 20 carbon atoms, a sulphonyl group having 1 to 12 carbon atoms, a sulfinyl group having 1 to 12 carbon atoms, an ureide group having 1 to 12 carbon atoms, a phosphoric amide group having 1 to 12 carbon atoms, a hydroxy group, a mercapto group, a halogen atom, a cyano group, a sulfo group, a carboxyl group, a nitro group, a hydroxamic acid group, a surufino group, a hydrazino group, an imino group, and a heterocycle group having 1 to 12 carbon atoms; and said substituents are each independently unsubstituted or further substituted with an alkyl group, an alkenyl group, an aralkyl group, an aryl group, an acyl group, an alkoxyl group, an aryloxy group, an acyloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbonylamino group, a sulfonyl amino group, a sulfamoyl group, a carbamoyl group, a cyano group, a halogen atom, a hydroxy group or a heterocyclic group.