Patent ID: 8722534

Claim:
A method, comprising: forming a recess in a dielectric layer of a substrate, said recess having corner portions adjacent an upper surface of said dielectric layer and sidewalls having a substantially vertical length; forming a first transition metal layer in the recess above said corner portions of the recess and above a portion, but not all, of said vertical length of said sidewalls of said recess; forming a second transition metal layer in the recess over the first transition metal layer to line the recess; filling the recess with a fill layer; annealing the substrate, wherein the first transition metal layer and the second transition metal layer form an alloy portion proximate at least the corner portions during the annealing, wherein the alloy portion has a reduced wettability for a material of the fill layer than the second transition metal; and polishing the substrate to remove portions of the fill layer extending above the recess.