Patent ID: 6690070
Filing Date: 2004-02-10
Classification: H01L

Abstract:
An insulating gate semiconductor device comprising:a gate oxide film formed on a semiconductor substrate of a first conductivity type; a field oxide film formed adjacent to the gate oxide film and thicker than the gate oxide film; a gate electrode comprising a first silicon layer and a second silicon layer, the first silicon layer being electrically in contact with the second silicon layer, the first silicon layer being disposed only on the gate oxide film, the second silicon layer being (continuous on the first silicon layer and the field oxide layer) disposed on the first silicon layer and the field oxide layer and the second silicon layer being (disposed on the first silicon layer) continuous on the first silicon layer and the field oxide layer so that the total thickness of the first and second silicon layers above the gate oxide film is larger than a thickness of the second silicon layer on the field oxide layer; and source and drain layers of a second conductivity type formed below (away from) the gate electrode.