Patent ID: 6527819
Filing Date: 2003-03-04
Classification: C09G,H01L

Abstract:
A method for chemical mechanical polishing copper, barrier material and dielectric material, the method which comprises the steps of:providing a first chemical mechanical polishing slurry having a removal rate on copper that is at least 3000 Ã¥/min; chemical mechanical polishing a semiconductor wafer surface with said first slurry; providing a second chemical mechanical polishing slurry having, a pH in a range of from about 2 to 5, and a removal rate on said barrier material that is greater than 500 Ã¥/min, a removal rate on said copper that is less than or equal to the removal rate of said barrier material and a removal rate on said dielectric material that is less than the removal rate of said barrier material; and chemical mechanical polishing said semiconductor wafer surface with said second slurry.