Patent ID: 8778756

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: forming a first interlayer insulating film over a semiconductor substrate; forming a first conductive film over the first interlayer insulating film; forming a ferroelectric film on the first conductive film; forming a second conductive film on the ferroelectric film; forming an upper electrode of a capacitor by patterning the second conductive film; forming a capacitor dielectric film by patterning the ferroelectric film; and forming a lower electrode of the capacitor by patterning the first conductive film, wherein the step of forming the first conductive film comprises the steps of: forming a lower conductive layer made of a noble metal other than iridium over the first interlayer insulating film; and forming an upper conductive layer on the lower conductive layer, the upper conductive layer being made of a conductive material, which is different from a material for the lower conductive layer, and which is other than platinum; and further comprising the steps of: forming a first impurity diffusion region and a second impurity diffusion region in the semiconductor substrate; forming a first hole in the first interlayer insulating film over the first impurity diffusion region; and forming a first conductive plug in the first hole, wherein, in the step of forming the lower electrode, the lower electrode is formed over the first conductive plug, and the lower electrode and the first conductive plug are electrically connected to each other; forming an underlying insulating film on the first interlayer insulating film and the first conductive plug; forming a second hole in the underlying insulating film on the first conductive plug; forming a second conductive plug in the second hole, the second conductive plug being electrically connected to the first conductive plug; forming a crystalline conductive film on the underlying insulating film and the second conductive plug; and forming a conductive oxygen barrier film on the crystalline conductive film, wherein, in the step of forming the first conductive film, the first conductive film is formed on the conductive oxygen barrier film.