Patent ID: 8790465
Filing Date: 2014-07-29
Classification: C11D,H01L,H05K

Abstract:
1. A method of cleaning a substrate having copper and dielectric damascene metallization, the surface of the copper having a cap of cobalt, cobalt alloy, nickel, nickel alloy, or cobalt-nickel alloy film, the method comprising: applying a cleaning solution to the substrate to remove at least one of defects and contamination, wherein the cleaning solution comprises an amine at a concentration from about 1 g/L to about 100 g/L to provide a pH for the cleaning solution of 7 to 13 and all values and subranges subsumed therein; a non-amine complexing agent at a concentration from about 0.5 g/L to about 50 g/L; a corrosion inhibitor at a concentration from about 0.01 g/L to about 20 g/L; a surface active agent at a concentration of 0.02 g/L to 2 g/L; an oxygen scavenger at a concentration from about 0.05 g/L to about 10 g/L, the oxygen scavenger comprising hydroxylamine, diethylhydroxylamine, methyl-ethylketoxime, carbohydrazide, chlorogenic acid, hydrazine, hydrazine salts, derivatives of hydrazine, caffeic acid, phytic acid, luteolin, and/or sulfites; a reducing agent at a concentration from about 0.1 g/L to about 10 g/L, the reducing agent comprising a boron containing reducing agent, a hypophosphite, and/or a thiosulfate; and a water soluble solvent at concentration from about 10 g/L to about 100 g/L.