Patent ID: 6919266
Filing Date: 2005-07-19
Classification: H01L

Abstract:
1. A method of forming a copper damascene structure, said method comprising the steps of: providing a metal layer within a semiconductor substrate; forming a low-dielectric constant layer over and in contact with said metal layer; directly patterning said low-dielectric constant layer to form at least one opening through said low-dielectric constant layer, said opening extending to at least a portion of said metal layer; forming a tungsten nitride layer by atomic-layer deposition using sequential surface reactions, said tungsten nitride layer being in contact with said at least one opening; removing horizontal portions of said tungsten nitride layer formed above a surface of said low-dielectric constant layer by chemical mechanical polishing; and subsequently providing a copper layer in said at least one opening and in contact with said tungsten nitride layer, wherein said copper layer is selectively deposited by low-temperature metal-organic chemical vapor deposition.