Patent ID: 8093071

Claim:
A method of manufacturing a semiconductor device, the method comprising: forming a first interlayer insulating film over a semiconductor substrate; forming a crystalline conductive film on the first interlayer insulating film; forming a first conductive film on the crystalline conductive film; forming a ferroelectric film on the first conductive film; forming a second conductive film on the ferroelectric film; forming a conductive cover film, made of platinum-group element except for iridium, on the second conductive film; forming a hard mask on the conductive cover film; etching the conductive cover film, the second conductive film, the ferroelectric film and the first conductive film in areas exposed from the hard mask, while using the hard mask as an etching mask, to form a capacitor including an upper electrode made of the second conductive film, a capacitor dielectric film made of the ferroelectric film, and a lower electrode made of the first conductive film, wherein side surfaces of the upper electrode, the capacitor dielectric film and the lower electrode reside in the same plane; and etching the hard mask and the crystalline conductive film in areas exposed from the lower electrode using an etching condition under which the hard mask is etched, wherein the forming of the second conductive film comprises: forming a first conductive metal oxide film on the ferroelectric film; and forming a second conductive metal oxide film on the first conductive metal oxide film, wherein a relation y2/y1>x2/x1 holds for compositions AO x1 and BO y1 (A and B represent metallic elements), where AO x1 and BO y1 being stoicheiometric compositions of first and second metal oxide constituting the first and second conductive metal oxide film respectively, and for AO x2 and BO y2 , where AO x2 and BO y2 being actual compositions of the first and second metal oxides respectively.