Patent ID: 7781820
Filing Date: 2010-08-24
Classification: H01L

Abstract:
1. A semiconductor memory device comprising: a semiconductor substrate; a transistor that is formed on the semiconductor substrate and has a source electrode; an interlayer insulating film that is formed over the semiconductor substrate; a contact plug that extends through the interlayer insulating film in a thickness direction and is electrically connected to the source electrode of the transistor, the contact plug being made of a first silicon film including first impurity atoms; an insulating film that is formed on the interlayer insulating film and has a cylinder hole; and a capacitor that comprises a second silicon film including the first impurity atoms, a Ti film on the second silicon film, a TiN film on the Ti film, a capacitive insulating film on the TiN film and an upper electrode on the capacitive insulating film, the second silicon film being disposed so as to cover a bottom and side surfaces of the cylinder hole, wherein the cylinder hole penetrates through the insulating film so as to expose an upper surface of the contact plug; and the second silicon film has a Ti silicide layer around an interface between the second silicon film and the Ti film, the Ti silicide layer being produced by a reaction of the second silicon film with the Ti film.