Patent ID: 7776712
Filing Date: 2010-08-17
Classification: G02F,H01L

Abstract:
1. A method of forming a semiconductor device comprising: forming a semiconductor layer over a substrate; forming a gate insulating film over the semiconductor layer; forming a first conductive film over the gate insulating film; forming a second conductive film over the first conductive film; forming a second layer of a gate electrode from the second conductive film; adding an impurity element having one conductivity type to the semiconductor layer through the gate insulating film and the first conductive film after forming the second layer of the gate electrode; forming a first layer of the gate electrode from the first conductive film so that a part of the first layer of the gate electrode extends beyond at least one of the side edges of the second layer of the gate electrode after adding the impurity element having one conductivity type to the semiconductor layer through the gate insulating film and the first conductive film; and adding an impurity element having the one conductivity type to the semiconductor layer through the gate insulating film after forming the first layer of the gate electrode.