Patent ID: 8309999
Filing Date: 2012-11-13
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first impurity diffusion region formed in a semiconductor substrate; a first interlayer insulating film formed over the semiconductor substrate, the first interlayer insulating film having a first hole over the first impurity diffusion region; a first conductive plug formed in the first hole and electrically connected to the first impurity diffusion region; an underlying insulating film formed over the first interlayer insulating film, the underlying insulating film having a second hole over the first conductive plug; a second conductive plug formed in the second hole, and electrically connected to the first conductive plug; a planarization conductive film formed on the second conductive plug and the underlying insulating film around the second conductive plug, the planarization conductive film being made of titanium nitride oriented in the (111) direction; a conductive adhesive film formed on the planarization conductive film; a crystalline conductive film formed on the conductive adhesive film; a conductive oxygen barrier film formed on the crystalline conductive film; a lower electrode formed on the planarization conductive film, where a planar size of the lower electrode is substantially the same as a planar size of the planarization conductive film; a capacitor dielectric film formed on the lower electrode and made of a ferroelectric material; and an upper electrode formed on the capacitor dielectric film, wherein the lower electrode comprises a lowest conductive layer and an upper conductive layer, the lowest conductive layer being made of a noble metal other than iridium, and the upper conductive layer being formed on the lowest conductive layer and made of a conductive material, which is different from a material for the lowest conductive layer, and which is other than platinum.