Patent ID: 6713353
Filing Date: 2004-03-30
Classification: H01L

Abstract:
A method of manufacturing a semiconductor integrated circuit device by forming an insulating film of a first thickness on a first active region of a semiconductor substrate and forming an insulating film of a second thickness smaller than said first thickness on a second active region, said method comprising the steps of:(a) forming a first insulating film on the surface of said semiconductor substrate; (b) forming a second insulating film on said first insulating film; (c) covering said first active region with a masking pattern; (d) successively removing said second insulating film and said first insulating film from said second active region by using said masking pattern as a mask; (e) selectively removing chiefly said second insulating film from said first active region after said masking pattern has been removed; and (f) forming a third insulating film on said semiconductor substrate.