Patent ID: 7655531

Claim:
A semiconductor device fabricating method comprising: forming over a semiconductor substrate a capacitor including a lower electrode, a dielectric film formed over the lower electrode and an upper electrode formed over the dielectric film; forming a first insulation film over the semiconductor substrate and the capacitor; forming a contact hole in the first film down to the capacitor; forming over the first insulation film a first interconnection electrically connected to the capacitor via the contact hole; forming over the first insulation film a first hydrogen diffusion preventive film for preventing the diffusion of hydrogen, covering the first interconnection; forming a second insulation film over the first hydrogen diffusion preventive film; polishing the surface of the second insulation film to planarize the surface of the second insulation film; forming a third insulation film over the second insulation film; forming a second interconnection over the third insulation film; and forming over the third insulation film a second hydrogen diffusion preventive film for preventing the diffusion of hydrogen, covering the second interconnection, wherein in the forming the second interconnection, a solid conduction film is further formed at least above the capacitor, in the forming the second hydrogen diffusion preventive film, the second hydrogen diffusion preventive film is formed, covering the solid conduction film, the first hydrogen diffusion preventive film and the second hydrogen diffusion preventive film are formed of metal oxide, said method further comprises forming a silicon nitride film over the second hydrogen diffusion preventive film, and forming a polyimide film over the silicon nitride film.