Patent ID: 8336204
Filing Date: 2012-12-25
Classification: H01L,Y10T

Abstract:
1. A method of forming an interconnect structure comprising: forming at least one opening in a dielectric material; forming a diffusion barrier on at least exposed wall portions of said dielectric material within said at least one opening, said diffusion barrier including at least an alloy metal A; forming a Cu alloy seed layer including an alloy metal B on said diffusion barrier; forming an alloy liner comprising alloy metal A and alloy metal B by annealing, said annealing causing diffusion of alloy metal A from the diffusion barrier and diffusion of alloy metal B from the Cu alloy seed layer and formation of said alloy liner directly between an underlying alloy metal A deficient diffusion barrier and an overlying alloy metal B deficient Cu alloy seed layer; and removing a portion of each of said alloy liner comprising alloy metal A and alloy metal B, said alloy metal A deficient diffusion barrier, and said metal B deficient Cu alloy seed layer from a bottom of the opening, wherein said removing comprises a directional etching process.