Patent ID: 8343816

Claim:
A method for manufacturing an organic transistor, the method comprising: forming a first conductive layer over a substrate; performing plasma treatment on a surface of the first conductive layer to form a gate insulating film, wherein the plasma treatment is performed with density of electron of 10 11 cm −3 or more and an electron temperature in a range of 0.2 eV to 2.0 eV; forming an organic semiconductor layer over the gate insulating film; forming a first composite layer over and in contact with the organic semiconductor layer, wherein the first composite layer comprise a first organic compound and a metal selected from an alkali metal and an alkaline-earth metal, forming a second composite layer over and in contact with the first composite layer, wherein the second composite layer comprises a second organic compound and a metal oxide which are mixed with each other; and forming a second conductive layer over and in contact with the second composite layer, wherein the second conductive layer is in contact with the first composite layer, the organic semiconductor layer and the substrate.