Patent ID: 6881643

Claim:
A method of producing a semiconductor device, the method comprising: sequentially forming an interlayer insulating film and a barrier film on a semiconductor substrate; making a contact hole in the barrier film and the interlayer insulating film, and forming a plug within the contact hole; forming an insulation film and then an adhesion film on the plug and the barrier film, and then forming a hole in the insulation film and the adhesion film leading to the plug such that an upper surface of the plug and an adjacent part of the barrier film are exposed; forming a first conductive film on the insulation and adhesion films and on and over an exposed part of the barrier film in the hole such that the hole in the insulation film and in the adhesion film is filled with the first conductive film, and then etching the first conductive film and the adhesion film by a chemical mechanical polishing method to thereby form a lower electrode within the hole in the insulation film; etching the insulation film until the barrier film is exposed, so as to leave the lower electrode in a protuberant manner; wherein the adhesion film is removed before the lower electrode is left in the protuberant manner; forming a dielectric film that covers the protuberant lower electrode and at least part of the barrier film, and then forming a second conductive film that covers at least part of the dielectric film, said dielectric film being made of a ferroelectric or high-dielectric-constant substance; and patterning the dielectric film and the second conductive film simultaneously to thereby form a capacitor dielectric film and an upper electrode.