Patent ID: 9735050
Date: 2017-08-15
CPC Classifications: H01L

Claim:
1. A method for forming a contact plug, the method comprising: forming a dielectric layer over a substrate; patterning an opening in the dielectric layer, the opening exposing the substrate; depositing a diffusion barrier layer in the opening; depositing a conductive liner comprising cobalt or ruthenium over the diffusion barrier layer, wherein the conductive liner as deposited is thicker on a bottom surface of the opening than on sidewalls of the opening; and filling remaining portions of the opening with a conductive core, wherein the conductive core and the conductive liner comprise different metallic materials, wherein a metallic material of the conductive core is in direct contact with a metallic material of the conductive liner, and wherein the conductive liner is disposed between the conductive core and the diffusion barrier layer.