Patent ID: 7008871

Claim:
A method for fabricating a patterned copper structure which comprises providing a dielectric material on a substrate, providing at least one trench/via in the dielectric material; providing a liner on the bottom and sidewalls of the at least one trench/via and on horizontal surfaces of the dielectric material in the vicinity of the at least one trench/via; depositing copper in the at least one trench/via on the liner; and selectively etching the copper by electroetching to recess the copper with respect to the top surfaces of the dielectric; and then selectively depositing on the Cu, one or more materials by electrolytic plating or by electroless plating, and wherein an etchant is applied through a nozzle for the electroetching and the nozzle is circular with a diameter smaller than the diameter of the substrate for reducing the overall current during the electroetching and wherein the electroetching is carried out under substantially constant voltage conditions.