Patent ID: 8772942

Claim:
A metal interconnect structure comprising: a dielectric material layer having at least one patterned recess therein; a barrier metallic liner located directly on surfaces of said dielectric material layer in said at least one patterned recess, wherein said barrier metallic liner comprises at least one elemental metal selected from Group IVB elements, Group VB elements, and Group VIB elements; a metallic liner stack located in said at least one patterned recess, said metallic liner stack comprising a Group VIIIB element layer and a CuMn alloy layer, 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 a Cu-containing conductive structure located on said metallic liner stack, wherein said Group VIIIB element layer is spaced from said Cu-containing conductive structure at least by said CuMn alloy layer, and is spaced from said dielectric material layer by said barrier material layer.