Patent ID: 7646050

Claim:
A semiconductor device, comprising: a semiconductor substrate; a first electrode that is formed over said semiconductor substrate; a capacitive insulating film that is formed on said first electrode and is comprised of a metal oxide ferroelectric; a second electrode that is formed on said capacitive insulating film; an insulating film that has a first opening which exposes a portion of an upper side of said second electrode and is formed so as to cover said first electrode, said capacitive insulating film, and said second electrode; a first barrier film that is formed inside said first opening and on said insulating film; a second barrier film that is formed by oxidizing a surface of said first barrier film; and a wiring film that is formed above said first barrier film and said second barrier film, and is electrically connected to the second electrode through the first and second barrier films, wherein the wiring film, the first barrier film and the second barrier film constitute one interconnection layer, wherein said first barrier film is comprised of TiN, and wherein said second barrier film is either a laminated film comprised of TiO 2 and Ti x O y N z or a single layer film comprised of Ti x O y N z .