Patent ID: 6737747
Filing Date: 2004-05-18
Classification: H01L

Abstract:
An interconnect structure formed on a substrate, the structure comprising:a dielectric layer overlying the substrate, said dielectric layer being fanned of a carbon-containing dielectric material having a dielectric constant of less than about 4; a continuous hardmask layer on said dielectric layer, said hardmask layer having a top surface; at least one conductor embedded in said dielectric layer and having a surface coplanar with the top surface of said hardmask layer; a cap layer on said at least one conductor and on said hardmask layer, said cap layer having a bottom surface in strong adhesive contact with said conductor, wherein said cap layer is formed of silicon nitride by a plasma-enhanced chemical vapor deposition (PE CVD) process; and a pre-clean layer disposed beneath said cap layer and on said at least one conductor and said hardmask layer, said pre-clean layer or being formed of a material comprising copper, silicon and oxygen.