Patent ID: 8124476

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: forming an impurity diffusion region in a surface layer of a semiconductor substrate; forming an insulating film on the semiconductor substrate; forming a hole in the insulating film above the impurity diffusion region; forming a conductive film for plug on an upper surface of the insulating film and in the hole; leaving the conductive film for plug only in the hole by polishing, and making the conductive film for plug in the hole into a conductive plug which is electrically connected to the impurity diffusion region; forming an underlying conductive film on each of the upper surfaces of the insulating film and the conductive plug; polishing an upper surface of the underlying conductive film to planarize the upper surface; forming a crystalline conductive film on the planarized upper surface of the underlying conductive film; and forming a capacitor in which a lower electrode, a capacitor dielectric film made of a ferroelectric material, and an upper electrode are laminated in this order on the crystalline conductive film.