Patent ID: 8354751
Filing Date: 2013-01-15
Classification: H01L

Abstract:
1. An interconnect structure comprising: a first interconnect level including a first dielectric material having at least one conductive feature embedded therein, said at least one conductive feature having a via gouging feature located therein; a patterned metallic capping layer located atop some, but not all, portions of the at least one conductive feature; a patterned dielectric capping layer located atop the patterned metallic capping layer and portions of the first dielectric material; a second interconnect level including a second dielectric material having at least one conductively filled line embedded in a porous dielectric material located atop and connected to an underlying conductively filled via embedded in a non-porous third dielectric material, a third diffusion barrier formed on all exposed surfaces of the one opening within the first dielectric material and on top of the hard mask comprising a multilayered stack with at least one layer of tantalum, at least one layer of ruthenium, and at least one layer of titanium.