Patent ID: 8211794
Filing Date: 2012-07-03
Classification: H01L

Abstract:
1. A method of fabricating a diffusion barrier in a damascene structure, comprising: providing a dielectric layer with a damascene opening formed therein to expose an underlying interconnect; enriching a surface of the dielectric layer with silicon to form a first silicon enriched dielectric layer at least within the damascene opening by exposing the dielectric layer to silane-containing gas, the silicon enriched dielectric layer providing a surface coverage on the dielectric layer of from approximately one-tenth to approximately five monolayers; forming a barrier layer over the first silicon enriched dielectric layer at least within the damascene opening, the barrier layer comprising one or more of ruthenium, iridium, rhodium, palladium, tantalum, tantalum nitride, tungsten carbonitride, tungsten nitride, or combinations thereof, depositing a second silicon enriched dielectric layer over the barrier layer; and filling the damascene opening with copper or a copper alloy.