Patent ID: 7592657

Claim:
A semiconductor device comprising: a first interlayer insulating film formed over a semiconductor substrate; a lower electrode formed over the first interlayer insulating film; a capacitor dielectric film formed over the lower electrode and made of ferroelectric material; an upper electrode including a first conductive metal oxide film and a second conductive metal oxide film which are sequentially formed over the capacitor dielectric film to form a capacitor together with the capacitor dielectric film and the lower electrode; a conductive cover film formed over the upper electrode and made of a platinum-group element except for iridium; and an alumina film formed over the conductive cover film and over a side surface of the capacitor; wherein a relation y 2 /y 1 >x 2 /x 1 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.