Patent ID: 8367428

Claim:
A method for manufacturing a semiconductor device comprising: 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, a plug conductive film in the first hole, to form 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 above the conductive oxygen barrier film; forming, above the conductive anti-diffusion film, a first conductive film; forming a ferroelectric film on the first conductive film; forming a second conductive film on the ferroelectric film; patterning the conductive anti-diffusion film, the first conductive film, the ferroelectric film and second conductive film; and removing the region of the conductive oxygen barrier film uncovered with the patterned first conductive film, wherein a film made of a non-oxide conductive material for preventing the diffusion of a constituent element of the ferroelectric film is formed as the conductive anti-diffusion film.