Patent ID: 6674137
Filing Date: 2004-01-06
Classification: H01L

Abstract:
A semiconductor device, comprising:at least one gate electrode formed over a semiconductor substrate having at least a portion with a reverse tapered shape when viewed in cross section; a mask insulating film formed on a top surface of the at least one gate electrode; a side surface insulating film formed on a side surface of the at least one gate electrode; a side wall insulating film formed on a side surface of the mask insulating film and the at least one gate electrode; a first impurity region formed in the semiconductor substrate with the at least one gate electrode and the side surface insulating film as a mask, and without the side wall insulating film as a mask; and a second impurity region formed in the semiconductor substrate with at least the side wall insulating film as a mask, the second impurity region having a higher impurity concentration than the first impurity region.