Patent ID: 7754562

Claim:
A method of fabricating a semiconductor memory device having a capacitor comprising the steps of: forming a field effect transistor having a gate electrode, a source region and a drain region, on a major surface of a semiconductor substrate; forming a first insulating film having a first opening over said field effect transistor; forming a conductive plug in said first opening, being electrically connected to said source or said drain region of said field effect transistor; forming a interlayer insulating film above said conductive plug and first insulating film; forming a second opening in said interlayer insulating film by etching procedure, and exposing an upper surface of said conductive plug in said opening; forming a first conductive film along an inner surface of said opening and an upper surface of said interlayer insulating film; removing said first conductive film over said interlayer insulating film, so as to leave said first conductive film along an inner surface of said opening; forming a dielectric film on said first conductive film; and forming a second conductive film on said dielectric film; wherein said step of forming a interlayer insulating film includes the steps of: forming a second insulating film, and forming a third insulating film over said second insulating film, and said second insulating film has an etching rate larger than the etching rate of said third insulating film.