Patent ID: 7235452

Claim:
A method for fabricating a capacitor in a semiconductor device, the method comprising the steps of: forming an interlayer insulating film on a semiconductor substrate, which includes a first contact hole exposing a portion of the substrate; forming a storage node plug filling the first contact hole; forming a first insulating film, a first silicon nitride film, and a second insulating film sequentially above the substrate inclusive of the storage node plug; forming a second silicon nitride film at least on the interlayer insulating film, before forming the first insulating film wherein the first and second silicon nitride films are substantially parallel to each other; forming a second contact hole that exposes the storage node plug by removing the second insulating film, the first silicon nitride film, the first insulating film partly and the second silicon nitride film; forming a recessed portion at side surfaces of the second contact hole and below the first silicon nitride film by wet-etching the first insulating film remained in the second contact hole; forming a storage node electrode of the capacitor, which is connected to the storage node plug, by filling the second contact hole inclusive of the recessed portion; removing the remained second insulating film; forming a dielectric film on the storage node electrode; and forming a plate electrode on the dielectric film and the silicon nitride film.