Patent ID: 8004030

Claim:
A semiconductor device comprising: a base insulating film formed over a semiconductor substrate; a capacitor formed on the base insulating film, the capacitor including a lower electrode, a capacitor dielectric film made of a ferroelectric material, and an upper electrode; a plurality of interlayer insulating films and metal interconnections which are alternately formed over the capacitor; and a conductive plug which is formed in a hole provided in the interlayer insulating films and is electrically connected to the first metal interconnections, wherein a first capacitor protection insulating film is formed on an upper surface of at least one interlayer insulating film among the plurality of interlayer insulating films, the first capacitor protection insulating film being formed by sequentially stacking a first insulating metal oxide film, an intermediate insulating film having a relative dielectric constant lower than that of silicon oxide, and a second insulating metal oxide film, wherein the at least one interlayer insulating film is a silicon oxide film; and the hole is also formed in the first capacitor protection insulating film.