Patent ID: 8049206

Claim:
An organic field effect transistor comprising: a semiconductor layer containing an organic semiconductor material; a source electrode and a drain electrode in a same layer; a gate electrode; and a gate insulating film interposed between the gate electrode and one of the source electrode and the drain electrode, wherein at least one of the source electrode and the drain electrode comprises a composite layer comprising an organic compound and an inorganic compound; wherein the organic compound is a carbazole derivative represented by a general formula (1); wherein each of R 11 and R 13 represents hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 25 carbon atoms, a heteroaryl group having 5 to 9 carbon atoms, an arylalkyl group, or an acyl group having 1 to 7 carbon atoms; Ar 11 represents an aryl group having 6 to 25 carbon atoms or a heteroaryl group having 5 to 9 carbon atoms; R 12 represents hydrogen, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms; R 14 represents hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a substituent represented by a general formula (2); and wherein in the substituent represented by the general formula (2), R 15 represents hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 25 carbon atoms, a heteroaryl group having 5 to 9 carbon atoms, an arylalkyl group, or an acyl group having 1 to 7 carbon atoms; Ar 12 represents an aryl group having 6 to 25 carbon atoms or a heteroaryl group having 5 to 9 carbon atoms; and R 16 represents hydrogen, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms: