Patent ID: 7033942
Filing Date: 2006-04-25
Classification: C09G,C09K,C23F,H01L,Y10S

Abstract:
1. A method of chemically mechanically polishing a substrate, said method comprising: providing a semiconductor wafer substrate comprising a surface having a metal to be polished; and contacting the surface with a polishing slurry comprising a first oxidizer and a second oxidizer, wherein the second oxidizer is different than the first oxidizer, and the slurry comprising the first and second oxidizers exhibits a synergistically increased metal removal rate, wherein: the first oxidizer is selected from the group consisting of ammonium persulfate, hydroxylamine nitrate, periodic acid, hydrogen peroxide, an indirect source of hydrogen peroxide, a urea hydrogen peroxide complex, or a percarbonate; the second oxidizer is selected from the group consisting of a peroxymonosulfate compound, hydroxylamine, potassium periodate, an IO