Patent ID: 7456454

Claim:
A semiconductor device comprising: a semiconductor substrate; a transistor formed on said semiconductor substrate and including a diffusion region formed in said semiconductor substrate; a capacitor formed on said semiconductor substrate and having a consecutively layered structure of a lower electrode, a ferroelectric film, and an upper electrode; an insulation film formed on said semiconductor substrate so as to cover said capacitor; a first contact hole formed in said insulation film so as to expose said upper electrode of said capacitor; a second contact hole formed in said insulation film so as to expose said diffusion region; a first CVD-deposited conductive plug formed in said first contact hole; and a second CVD-deposited conductive plug formed in said second contact hole, wherein a first conductive nitride film is formed between said first conductive plug and said upper electrode so as to completely cover an inner wall of said first contact hole and a surface of said upper electrode directly, and wherein there is provided a conductive film having a composition different from said first conductive nitride film between said diffusion region and said second conductive plug in said second contact hole, said first conductive nitride film completely covering said inner wall of said first contact hole and said surface of said upper electrode directly being disconnected at a top edge of said first contact hole, said conductive nitride film having a substantially stoichiometric composition.