Patent ID: 6309964
Filing Date: 2001-10-30
Classification: H01L

Abstract:
A method for forming a damascene structure over tungsten plugs using nitridation of said tungsten plugs, comprising the steps of:a. providing a substrate structure, having at least one device layer thereon; said device layer having a first dielectric layer thereover; said dielectric layer having tungsten plugs therein providing a conductive path between the surface of said dielectric layer and said device layer;b. nitridizing said tungsten plugs to form a tungsten nitride (WN.sub.x) layer on said tungsten plugs;c. depositing a second dielectric layer over said WN.sub.x layer and said first dielectric layer;d. patterning said second dielectric layer to form a trench in said second dielectric layer; whereby said WN.sub.x layer is exposed in said trench;e. forming a barrier layer in said trench;f. forming a metal layer over said barrier layer; andg. planarizing said metal layer and said second dielectric layer to form a damascene structure.