Patent ID: 8143660

Claim:
A capacitor of a semiconductor device, the capacitor comprising: an interlayer dielectric (ILD) film on a semiconductor substrate, the ILD film including a conductive plug therein; a lower electrode formed on the ILD film; an AHO ((Al x ,Hf 1-x )O y ) film formed on the lower electrode; an upper electrode formed on the AHO ((Al x ,Hf 1-x )O y ) film; and an oxidation barrier film formed between the lower electrode and the AHO ((Al x ,Hf 1-x )O y ) film; a dielectric film having a dielectric constant that is higher than that of the AHO ((Al x ,Hf 1-x )O y ) film between the upper electrode and the AHO ((Al x ,Hf 1-x )O y ) film, wherein the dielectric film is an HfO 2 layer, a ZrO 2 layer, or an STO layer, wherein the dielectric film is directly in contact with the upper electrode, and wherein the lower electrode, the oxidation barrier film and the AHO film include a recess above the conductive plug, and the recess is filled by the upper electrode.