Patent ID: 6972990

Claim:
A ferro-electric memory device comprising: a semiconductor substrate; a gate electrode which is formed on the semiconductor substrate; a first diffusion layer and a second diffusion layer, which are formed in the semiconductor substrate on both sides of the gate electrode; a first insulating film which is formed on the semiconductor substrate and the gate electrode; a first contact which extends through the first insulating film and is electrically connected to the first diffusion layer; a first oxygen barrier film having insulating properties, which is formed on the first contact and the first insulating film; a second insulating film which is formed on the first oxygen barrier film; a second contact which extends through the second insulating film and the first oxygen barrier film and is electrically connected to the first contact; a second oxygen barrier film having insulating properties, which is formed on the second contact and the second insulating film; a ferro-electric capacitor which is formed in the second insulating film and has a lower electrode, a ferro-electric film, and an upper electrode; a third contact which is electrically connected to the upper electrode; a first interconnection which is electrically connected to the second contact and the third contact; and a third oxygen barrier film having insulating properties, which is arranged between the ferro-electric capacitor and the second contact and brought into contact with the first oxygen barrier film.