Patent ID: 6727146
Filing Date: 2004-04-27
Classification: H01L

Abstract:
A method of manufacturing a semiconductor comprising the steps of:(a) forming a first gate insulation film in a first region of a main face of a semiconductor substrate, followed by forming a second gate insulation film that is thicker than the first gate insulation film in a second region of a main face of the semiconductor substrate; (b) applying oxynitridation to the first and second gate insulation film; (c) forming a first gate electrode of a first MISFET on top of the first gate insulation film, followed by forming a second gate electrode of a second MISFET on top of the second insulation film; and (d) implanting an ion that contains nitrogen or nitrogen atoms in at least one part of an interface between the second gate insulation film and the semiconductor substrate before or after the step (a) or before or after the step (c).