Patent ID: 7605392

Claim:
A field effect transistor comprising at least a substrate, an organic semiconductor layer, an insulating layer, and a conductive layer, wherein the insulating layer comprises a cured product of a phenol resin represented by a following general formula (1): wherein, R 1 , R 2 and R 3 are each independently at least one selected from the group consisting of hydrogen atom, halogen atom, hydroxymethyl group, alkyl group having 1 to 12 carbon atoms, alkenyl group, alkinyl group, alkoxyl group, alkylthio group, and alkyl ester group, X 1 and x 2 are each independently at least one selected from the group consisting of hydrogen atom, alkyl group having 1 to 12 carbon atoms, alkenyl group, alkinyl group, and aryl group, and n is an integer of 0 to 2,000.