Patent ID: 8748962
Filing Date: 2014-06-10
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 recessed portion formed on the second conductive plug; a planarization conductive film formed only in the recessed portion, 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 over 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.