Patent ID: 7153197
Filing Date: 2006-12-26
Classification: B24B,H01L,Y10S

Abstract:
1. A method for removing a copper oxide overlayer over a copper containing semiconductor process wafer polishing surface prior to a copper chemical mechanical polishing (CMP) process to improve copper polishing uniformity comprising the steps of: providing a semiconductor process wafer comprising a copper containing polishing surface having said copper oxide overlayer; removing said copper oxide overlayer according to a process selected from the group consisting of a dipping, megasonic agitation, and brushing, said process comprising a first carboxylic acid containing solution; carrying out a cleaning step; and, then polishing the copper containing polishing surface to a CMP process comprising an abrasive slurry with a complexing agent in the absence of an oxidizer, said complexing agent comprising a second carboxylic acid.