Patent ID: 6749691
Filing Date: 2004-06-15
Classification: B08B,C23G,Y10S

Abstract:
A method of removing discoloration from a metal surface of an integrated circuit flip-chip package, the method comprising the steps of:a) exposing a metallic surface of an integrated circuit flip-chip package to a first composition comprising an organic reagent, the metallic surface having discoloration thereon, said discoloration caused by the presence of non-ionic residues, oxides, hydroxides, and organic residues, under conditions sufficient to form a first intermediate metallic surface having less than 1 ppm total of said non-ionic residues; b) contacting the first intermediate metallic surface with a second composition comprising an acid under conditions sufficient to form a second intermediate metallic surface having less than 10 ppm total of said non-ionic residues, oxides, and hydroxides; and c) rinsing the second intermediate metallic surface with deionized water, the deionized water having less than 1 ppm organic compounds, under conditions sufficient to form a cleaned metallic surface having less than 1 ppm total of said non-ionic residues, oxides, hydroxides, organic residues, the first composition and the second composition, and thereby removing said discoloration.