Patent ID: 6451688
Filing Date: 2002-09-17
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device, comprising the steps of:forming a second film uniformly on the surface of an interlayer insulating film being formed on the surface of a semiconductor substrate or a wire layer via a first film; patterning a first mask layer above said second film so as to selectively expose the surface of said second film; removing said second film selectively by using said first mask layer to the extent that said interlayer insulating film is exposed and thereby creating a step differential within said second film; patterning a second mask layer so as to form an opening exposing the lower side of said step differential at the bottom thereof; etching said second film so as to at least partially expose said interlayer insulating film, and subsequently etching said interlayer insulating film; and removing said second mask layer and thereafter etching said second mask layer and subsequently etching said interlayer insulating film so as to expose said first mask layer and thereby configuring a window having a step differential on said interlayer insulating film.