Patent ID: 6110396
Filing Date: 2000-08-29
Classification: H01L,Y10S

Abstract:
A method for polishing a surface comprising a metal selected from the group consisting of aluminum, copper, tungsten and alloys thereof, comprising:providing on said surface a slurry comprising abrasive particles and a dual-valent rare earth ion dissolved in said slurry, wherein said rare earth ion is in its higher valent form, and wherein the amount of said abrasive particles is about 0.2 to about 20 percent by weight and the amount of said dual-valent rare earth ion is about 0.05 to about 2 percent by weight, the amounts being based upon the total of said abrasive particles and rare earth ion or hydroxide in said slurry, and wherein said slurry has an acidic pH; and polishing said surface by contacting it with a polishing pad.