Field effect type organic transistor and process for production t hereof

A field effect type organic transistor comprising a source electrode, a drain electrode, a gate electrode, a gate insulating layer, and an organic semiconductor layer, wherein a surface portion of the gate insulating layer being in contact with the organic semiconductor layer is anisotropic, and the gate insulating layer is comprised of any one compound selected from the group consisting of:

• wherein R represents H, a halogen, CN, CF3, or an alkyl or perfluoroalkyl group of 1 to 20 carbon atoms, where in the alkyl, one or more of methylene groups may be replaced by O, CO, NH, or S;
• X represents an alkylene group of 1 to 20 carbon atoms, where in the alkylene, one or more of methylene groups may be replaced by O, CO, NH, or S;
• A represents —CH—CH2—, —C(CH3)—CH2—, or —SiZ-O—, with Z representing an alkyl or alkoxy group of 1 to 20 carbons;
• and the symbol n represents an integer showing a polymer, ranging from 10 to 100,000 corresponding to a number-average polymerization degree.