Patent ID: 7968455

Claim:
A method for metallizing an electrical interconnect feature with copper, the electrical interconnect feature being located in a dielectric material on a semiconductor integrated circuit device substrate, wherein the dielectric material has a top-field surface and the electrical interconnect feature has a bottom, a sidewall having a depth and a top opening having an opening dimension, the method comprising: forming a deposit on the bottom and the sidewall of the electrical interconnect feature, the deposit comprising a copper wettable metal; forming a copper-based deposit on the top-field surface; forming an initial metal profile in the electrical interconnect feature, the initial metal profile comprising copper metal deposited on the bottom of the electrical interconnect feature and a segment of the sidewall having essentially no copper metal thereon, wherein the initial metal profile is formed by (i) depositing a copper seed layer on the bottom and the sidewall of the interconnect feature and (ii) dissolving a portion of the copper seed layer to thereby form the initial metal profile; partially filling the interconnect feature by electrolytic Cu deposition between said (i) depositing the copper seed layer on the bottom and the sidewall of the interconnect feature and said (ii) dissolving the portion of the copper seed layer; and filling the electrical interconnect feature having the initial metal profile with copper to thereby metallize the electrical interconnect feature .