Patent ID: 8343830

Claim:
A method of manufacturing a semiconductor device comprising: forming a first insulating film over a semiconductor substrate; forming a capacitor over the first insulating film, the capacitor having a lower electrode, a capacitor dielectric film made of a ferroelectric material, and an upper electrode; forming a second insulating film covering the capacitor; forming a first hole in the second insulating film above the lower electrode; forming an aluminum film over the second insulating film and in the first hole; patterning the aluminum film to form a metal wiring that directly contacts the lower electrode; forming a first capacitor protective insulating film covering the metal wiring and the second insulating film; forming a third insulating film over the first capacitor protective insulating film; etching the third insulating film to remove the third insulating film located above the metal wiring and to form an insulating sidewall on the first capacitor protective insulating film beside the metal wiring; forming a fourth insulating film over the insulating sidewall to cover the metal wiring with the fourth insulating film; polishing the fourth insulating film; after polishing the fourth insulating film, forming a second hole, which reaches the metal wiring that contacts the lower electrode, in the fourth insulating film over the metal wiring by selectively etching the fourth insulating film under an etching condition that an etching rate of the insulating sidewall becomes lower than that of the fourth insulating film; and forming a conductive plug, which is connected to the metal wiring, in the second hole.