Patent ID: 8119476

Claim:
A method of forming an integrated circuit capacitor, comprising: forming a first mold layer of a first material on a substrate; forming a trench in an upper surface of the first mold layer; forming a second mold layer in the trench and on an upper surface of the first mold layer, said second mold layer comprising a second material different from the first material; forming an opening that extends through at least a portion of the second mold layer in the trench and at least partially through the first mold layer at a location adjacent a bottom of the trench; forming a U-shaped capacitor electrode in the opening; selectively etching back the second mold layer to expose a sidewall of the trench; selectively removing at least a portion of the first mold layer to expose at least a portion of the second mold layer that at least partially wraps around the U-shaped capacitor electrode; covering an exterior portion of the U-shaped capacitor electrode and the exposed portion of the second mold layer with a capacitor dielectric layer; and forming an upper capacitor electrode on the capacitor dielectric layer.