Patent ID: 6046108
Filing Date: 2000-04-04
Classification: H01L

Abstract:
A method of forming a device on a surface of a conductive substrate comprising:forming a dielectric layer over said surface, said dielectric layer having a top level;forming a trench with sidewalls through said dielectric layer to expose a portion of said surface;forming a barrier layer narrowing said trench and covering said surface and covering said top level and said sidewalls of said dielectric layer;depositing copper as a blanket overfilling said narrow hole and covering said top level;subtracting material from the surface of said copper leaving a thin layer of said copper covering said barrier layer and said dielectric layer,forming a copper passivation combination with an element selected from silicon and germanium thereby lowering remaining portions of said copper below said dielectric top level in said narrow hole; andplanarizing said copper passivation combination to said top level leaving a thin layer of said compound covering said copper conductor in said narrow hole.