Patent ID: 8044447

Claim:
A semiconductor device comprising: a semiconductor substrate; a first impurity diffusion region formed in a surface layer of the semiconductor substrate; a first insulating film provided with a first hole over the first impurity diffusion region; a conductive film, which is formed over an inner surface of the first hole and is electrically connected to the first impurity diffusion region; a filler body, which is formed over the conductive film and formed in the first hole with a thickness to fill the first hole, where the filler body constituting a first contact plug together with the conductive film, and at least an upper surface of the filler body being made of amorphous insulating material, and the filler body being removed outside the first hole; and a capacitor, which is formed over the first contact plug and is provided with a lower electrode electrically connected to the conductive film, a capacitor dielectric film formed of a ferroelectric material, and an upper electrode.