Patent ID: 8110411

Claim:
A method for manufacturing a semiconductor device comprising the steps of: forming a first impurity diffusion region in a semiconductor substrate; forming a first interlayer insulating film over the semiconductor substrate; forming a first hole in the first interlayer insulating film; forming, in the hole, a first conductive plug electrically connected to the first impurity diffusion region; forming a conductive oxygen barrier film on each of the first interlayer insulating film and the first conductive plug; forming a conductive anti-diffusion film on the conductive oxygen barrier film; forming, on the conductive anti-diffusion film, a first conductive film exposing any of platinum and palladium on an upper surface; forming a ferroelectric film on the first conductive film; forming a second conductive film on the ferroelectric film; forming a capacitor including a lower electrode, a capacitor dielectric film and an upper electrode by patterning the conductive anti-diffusion film, the first conductive film, the ferroelectric film and the second conductive film while leaving the conductive anti-diffusion film in an island shape below the lower electrode; and removing the region of the conductive oxygen barrier film uncovered with the lower electrode, wherein a film made of a non-oxide conductive material for preventing the diffusion of a constituent element of the capacitor dielectric film is formed as the conductive anti-diffusion film.