Patent ID: 6846711

Claim:
A semiconductor device manufacturing method comprising the steps of: forming an interlevel insulating film on a semiconductor substrate; forming a contact plug from a conductive material so as to extend through the interlevel insulating film; forming a barrier film so as to cover the contact plug exposed from the interlevel insulating film; forming a first electrode from a metal material on the interlevel insulating film so as to be connected to the contact plug via the barrier film; forming a capacitor insulating film from an insulating metal oxide on the first electrode; and forming a second electrode on the capacitor insulating film, wherein the barrier film is formed from at least two layers, one layer of which is formed from WN, and the remaining layer is a film formed on the WN layer and includes Si and at least one chosen from either W or N, wherein the barrier film is formed by forming the tungsten nitride film and then forming a silicon nitride film on the tungsten nitride film by thermal chemical vapor deposition using nitrogen source gas and silicon source gas, and wherein the barrier film is formed from a first tungsten nitride thin film and a second silicon nitride thin film formed on the first thin film.