Patent ID: 7045415

Claim:
A manufacturing method of a MIM capacitor comprising the steps of: forming a first electrode from a metal material by a damascene process; forming on the first electrode a first insulating film having a function of preventing diffusion of the metal material; removing part of the first insulating film to use the part as a capacitor area; forming in the capacitor area a first diffusion prevention film having a function of preventing diffusion of the metal material; forming on the first diffusion prevention film a capacitor insulating film, a second diffusion prevention film having a function of preventing diffusion of the metal material, and a second insulating film having the same function as the first insulating film; forming an interlevel insulating film on the first and second insulating films; forming using the damascene process trenches reaching the first electrode and the second diffusion prevention film in the interlevel insulating film and the first and second insulating films; and filling the metal material in the trenches to form a wiring line connected to the first electrode and a second electrode connected to the second diffusion prevention film.