Patent ID: 7402489

Claim:
A method for fabricating a capacitor having a first and a second electrode, comprising: forming an insulative layer on a surface; forming an opening in the insulative layer to expose a portion of the surface; forming a conductive plug in the opening, the conductive plug forming a first portion of the first electrode of the capacitor, the conductive plug recessed below a surface of the insulative layer; forming a first conductive layer overlying the conductive plug, the first conductive layer forming a second portion of the first electrode; forming a second conductive layer, for preventing diffusion of atoms, in the opening and overlying the first conductive layer such that the second conductive layer is surrounded on sidewalls by the insulative layer, the second conductive layer forming a third portion of the first electrode, the first conductive layer reducing a contact resistance between the conductive plug and the second conductive layer; and forming a third conductive layer overlying the second conductive layer to form a fourth portion of the first electrode.