Patent ID: 7405133
Filing Date: 2008-07-29
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, which comprises: forming a first insulating film on a semiconductor substrate having a semiconductor element formed therein; burying a first conductive layer in the first insulating film, said first conductive layer being electrically connected with the semiconductor element, and said first insulating film and the first conductive layer having the same surface level and forming a flat surface structure; forming a second conductive layer and a dummy film formed of a material selected from the group consisting of a metal, an oxide, and nitride, successively on said first insulating film, said second conductive layer being in contact with the first insulating film and the first conductive layer; forming a dummy film pattern by patterning said dummy film; forming a lower electrode by etching said second conductive layer with only said dummy film pattern being employed as an etching mask; forming a second insulating film on said first insulating film and on said dummy film pattern; removing a surface region of said second insulating film by means of chemical mechanical polishing to expose a surface of said dummy film pattern; forming a hole having a bottom exposing said lower electrode by removing said dummy film pattern; forming a ferroelectric film on the second insulating film and in the hole; removing a surface region of said ferroelectric film by means of chemical mechanical polishing to expose a surface of said second insulating film, said hole being filled with the ferroelectric film having substantially the same thickness as the dummy film pattern; and forming an upper electrode on said ferroelectric film thereby forming a capacitor.