Patent ID: 6955979

Claim:
A method for making a metallization structure comprising: forming a substrate comprising at least one metal layer on a surface thereof, a first layer of the at least one metal layer comprising titanium; forming a dielectric layer over the at least one metal layer; forming an aperture through the dielectric layer to expose a surface of the at least one metal layer; forming a conducting layer in the aperture such that at least a bottom surface of the conducting layer contacts a portion of the at least one metal layer; forming at least one upper metal layer overlying the dielectric layer and the conducting layer in the aperture, a first upper metal layer of the at least one upper metal layer comprising titanium; removing portions of the at least one upper metal layer overlying the dielectric layer, removing the dielectric layer, and removing portions of the at least one metal layer surrounding the conducting layer to form a multilayer metal structure having at least one sidewall; and forming a titanium spacer flanking the at least one sidewall of the multilayer metal structure.