Patent ID: 7186604

Claim:
A method of producing a semiconductor integrated circuit device, comprising the steps of: (a) forming a high dielectric constant insulating film over a semiconductor substrate; (b) forming a conductive film over the high dielectric constant insulating film; (c) forming a mask film over the conductive film; (d) selectively removing the mask film thereby forming a mask pattern; (e) etching the conductive film by using the mask film having the mask pattern as a mask thereby forming a conductor piece; (f) removing the mask film in a state of leaving the high dielectric constant insulating film on both ends of the conductor piece over the semiconductor substrate; (g) after the step (f), removing the high dielectric constant insulating film on both ends of the conductor piece over the semiconductor substrate; (h) after the step (g), forming semiconductor regions in the semiconductor substrate; and (i) after the step (h), forming side wall on side surfaces of the conductor piece by depositing an insulating film and anisotropically etching the insulating film.