Patent ID: 8242600
Filing Date: 2012-08-14
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a dielectric material having a dielectric constant of about 4.0 or less located above a substrate, the dielectric material having at least one opening located therein; a diffusion barrier located contiguously within the at least one opening; a redundant diffusion barrier layer comprising Ru and a Co-containing material located contiguously on the diffusion barrier within the at least one opening; and a conductive material located atop the redundant diffusion barrier within the at least one opening, wherein the diffusion barrier, the redundant diffusion barrier layer, and the conductive material each has an upper surface that is co-planar to an upper surface of the dielectric material, and wherein said redundant diffusion barrier layer is selected from the group consisting of a bilayer structure comprising a top layer of Ru and a bottom layer comprising at least said Co-containing material, a single layered structure including a gradient concentration of Ru which increases from a lower Co-containing surface upperwards and a multilayered structure including more than two alternating Ru and Co-containing layers.