Patent ID: 7455791

Claim:
A method of chemical mechanical polishing an electronic component substrate comprising the steps of: a) obtaining an electronic component substrate, the electronic component substrate having an insulating film deposited over it, an interconnection pattern formed in the insulating film, and interconnection material deposited on the insulated film and in the interconnection pattern; and b) polishing the interconnection material until a surface of said insulating film is exposed by using an aqueous chemical mechanical polishing slurry comprising, in a concentration of from about 5 to about 20 wt %, aluminum-treated precipitated amorphous silica abrasive particles, wherein at least 75% of said particles having a particle size of less than 1 micron, and wherein the aluminum content of said aluminum-treated precipitated amorphous abrasive silica particles is from about 0.09 to about 0.3 wt% of the entire amount of said treated silica particles.