Patent ID: 7465657
Filing Date: 2008-12-16
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device comprising the steps of: forming a first impurity diffusion region in a surface layer of a semiconductor substrate; forming a first insulating film over the semiconductor substrate; forming a first hole over the first impurity diffusion region by patterning the first insulating film; forming a first conductive plug, which is electrically connected to the first impurity diffusion region and an upper end portion of which is protruded upward from an upper surface of the first insulating film, in the first hole; forming a conductive oxygen barrier film on the first conductive plug and the first insulating film; patterning the conductive oxygen barrier film to leave the conductive oxygen barrier film to cover the upper end portion of the first conductive plug; forming an insulating oxygen barrier film on the first insulating film and the conductive oxygen barrier film; polishing the insulating oxygen barrier film to expose a surface of the conductive oxygen barrier film such that each upper surface of the conductive oxygen barrier film and the insulating oxygen barrier film constitute a continuous flat surface; forming a capacitor lower electrode conductive film on the flat surface; forming a ferroelectric film on the capacitor lower electrode conductive film; forming a capacitor upper electrode conductive film on the ferroelectric film; and forming a capacitor, which is constructed by laminating sequentially a capacitor lower electrode, a capacitor dielectric film, and a capacitor upper electrode, by patterning the capacitor upper electrode conductive film, the ferroelectric film, and the capacitor lower electrode conductive film.