Patent ID: 7064028
Filing Date: 2006-06-20
Classification: H01L

Abstract:
1. A method of producing a semiconductor memory, comprising: forming an inter-layer insulating film over a semiconductor substrate, the inter-layer insulating film having at least one conductive plug embedded therein, the conductive plug being electrically connected to a diffusion layer formed in the surface of the semiconductor substrate; forming a first insulating film on the inter-layer insulating film; forming a first dummy insulating film on the first insulating film; forming a beam-like insulator on the first dummy insulating film; selectively removing the first dummy insulating film and the first insulating film to provide a hole, an outer wall portion of the hole touching the beam-like insulator and a bottom of the hole reaching the conductive plug; forming a first conductive film extending from an inner wall of the hole to the bottom thereof, the first conductive film functioning as a lower electrode; selectively removing the first dummy insulating film in relation to the beam-like insulator and the first insulating film to have the lower electrode, the beam-like insulator and the first insulating film remaining un-removed; forming a dielectric film to cover inner and outer surfaces of the lower electrode; and forming a second conductive film on the dielectric film, the second conductive film functioning as an upper electrode.