Patent ID: 6090214
Filing Date: 2000-07-18
Classification: B08B,C11D

Abstract:
A method of cleaning a slurry residue from a surface of a copper layer, the copper layer disposed on a substrate which has been polished with a slurry composed of abrasive particles, comprising the steps of:a) bringing a brush into contact with the surface of the substrate;b) providing a relative motion between said brush and said substrate;c) exposing the substrate to a rinse solution comprising de-ionized water and ammonium persulphate while the substrate is in contact with said brush; andd) continuing step ""c"" until the slurry residue is removed from the copper layer;wherein the composition of the rinse solution is selected to undercut the abrasive particles residing on the surface of the copper layer and the pH of the rinse solution is selected so that the abrasive particles do not electrostatically cling to the surface of the copper layer.