Patent ID: 6906374

Claim:
A semiconductor device formed on a semiconductor substrate including a capacitor region and a peripheral region comprising: an interlayer insulation film located above said semiconductor substrate; and a tubular metal film with a bottom end portion, having the bottom located at a lower side and an opening side located at an upper side so as to pierce said interlayer insulation film, and an underlying interlayer insulation film underlying said interlayer insulation film, wherein said underlying interlayer insulation film is composed of an upper underlying interlayer insulation film and a lower underlying interlayer insulation film that is thicker than said upper underlying interlayer insulation film and is located beneath said upper underlying interlayer insulation film, said bottom end portion of said tubular metal film penetrates said upper underlying interlayer insulation film and enters into said lower underlying interlayer insulation film so that a recess is made in an upper part of said lower underlying interlayer insulation film and said bottom end portion of said tubular metal film is in direct contact with side surfaces of said recess, and said opening side of said tubular metal film being formed only of a portion of said tubular metal film extending along a wall surface of a through hole where said tubular metal film is located.