Patent ID: 8716134

Claim:
A method of forming a metal interconnect structure comprising: forming at least one patterned recess in a dielectric material layer; depositing a Group VIIIB element layer in said at least one patterned recess; depositing a CuMn alloy layer over said Group VIIIB element layer, wherein said Group VIIIB element layer is a layer of a single elemental metal selected from Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, and Pt; and forming a metallic alloy liner comprising Mn and at least one Group VIIIB element by annealing said Group VIIIB element layer and said CuMn alloy layer, wherein Mn in said CuMn alloy layer diffuses into said Group VIIIB element layer to form said metallic alloy liner, wherein said CuMn alloy layer loses more than 50% of Mn during said annealing.