Patent ID: 6447373
Filing Date: 2002-09-10
Classification: C09G,C09K

Abstract:
A method for chemical-mechanical polishing a metal layer of a substrate, the method which comprises the steps of:a) providing a chemical mechanical polishing slurry comprising particles dispersible in an aqueous medium, said aqueous medium having a static etch rate with respect to the metal layer of less than about 75 Angstroms per minute, said slurry particles having a surface area ranging from about 40 m2/g to about 430 m2/g, an aggregate size distribution less than about 1.0 micron, a mean aggregate diameter less than about 0.4 micron and said slurry comprising an amount of at least one ionic species which is sufficient to prevent a force sufficient to repel and overcome van der Waals forces between the particles, wherein said slurry particles are able to readily form agglomerates of greater than 0.75 microns and said agglomerates being stable stage 1 agglomerates; and b) chemical mechanical polishing a metal layer on a semiconductor substrate with said slurry.