Patent ID: 7199043
Filing Date: 2007-04-03
Classification: H01L

Abstract:
1. A method of forming a copper wiring in a semiconductor device, comprising: providing a substrate in which a damascene pattern is formed in an interlayer insulating film; forming a copper anti-diffusion conductive film and a copper layer on the structure including the damascene pattern; forming a copper wiring in the damascene pattern by means of a chemical mechanical polishing process, wherein the chemical mechanical polishing process is performed until a top surface of the copper wiring is concave from a top view and the top surface of the copper wiring has a lowermost portion disposed below a top surface on the interlayer insulating film; performing an annealing process to convert the concave top surface of the copper wiring to a convex top surface so that side edges of the copper wiring that engage the copper anti-diffusion conductive film are disposed below a top surface of the interlayer insulating film, wherein the annealing process is performed using an inert gas of N forming a copper anti-diffusion insulating film on the entire structure including the convex the top surface of the copper wiring having the convex shape, thereby flatting a surface of the entire structure.