Patent ID: 7960226

Claim:
A method comprising: forming an interlayer dielectric (ILD); forming a first conductor structure in said ILD; forming a bottom electrode layer over said first conductor structure from two or more layers of different materials, said bottom electrode layer having a surface including a series of grooves, said bottom electrode layer including conductive material that prevents diffusion of copper and oxygen, wherein the formation of the bottom electrode layer having said surface including said series of grooves comprises depositing a polycrystalline film of said conductive material on said first conductor structure, and selectively etching grain boundaries of said polycrystalline film with a wet chemical etch; forming a dielectric layer over said bottom electrode layer in an oxidizing atmosphere; forming a top electrode layer over said dielectric layer from two or more layers of different materials, said top electrode layer including conductive material that prevents diffusion of copper and oxygen; and forming a hard mask over said top electrode layer, said hard mask comprising tungsten.