Patent ID: 8975626
Filing Date: 2015-03-10
Classification: H01L

Abstract:
1. A flexible semiconductor device comprising: a metal layer comprising a gate electrode, a source electrode and a drain electrode; a metal oxide film, wherein the metal oxide film is an oxidized portion of a surface region of the metal layer; a semiconductor layer formed above the gate electrode via the metal oxide film; and a first extraction electrode and a second extraction electrode, wherein the first extraction electrode is arranged on the metal oxide film such that the metal oxide film is sandwiched between the first extraction electrode and the source electrode, and the second extraction electrode is arranged on the metal oxide film such that the metal oxide film is sandwiched between the second extraction electrode and the drain electrode, wherein uncovered portions are locally formed in the surface region of the metal layer such that each of the uncovered portions of the surface region of the metal layer is not covered with the metal oxide film, wherein, via the uncovered portions, the source electrode and the semiconductor layer are electrically interconnected, and also the drain electrode and the semiconductor layer are electrically interconnected, wherein the metal layer, from which the gate, source and drain electrodes are provided, is made of a metal foil, wherein each of the uncovered portions of the metal foil serves as an interlayer connecting portion, and a part of the oxidized portion of the metal foil is a gate insulating film, wherein the metal layer comprises a first metal layer and a second metal layer, wherein the first metal layer comprises a valve metal and the second metal layer comprises a metal other than the valve metal, wherein the metal oxide film is an anodic oxide film made from the valve metal, wherein the metal oxide film is an oxidized portion of a surface region of only the first metal layer, and wherein the oxidized portion of the surface region of the first metal layer includes an upper surface and side surfaces of the first metal layer.