Patent ID: 6699402
Filing Date: 2004-03-02
Classification: C09G,C23F,H01L

Abstract:
A halide-based aqueous polishing slurry composition, for use in a chemical mechanical polishing process to remove noble metal and/or noble metal alloy from a substrate having said noble metal and/or noble metal alloy deposited on the substrate, comprising:(1) abrasive polishing particles; and (2) a halide-based oxidizer chemistry consisting essentially of: (a) a bromide compound selected from group consisting of ammonium bromide, potassium bromide, sodium bromide, and hydrogen bromide, wherein the bromide compound is present in the halide-based oxidizer chemistry in a concentration of at least about 12 percent by weight thereof; (b) a bromate compound, which provides free bromine as an oxidizing agent in the composition, the bromate compound in an amount less than the bromide compound; and (c) an organic acid, which mediates decomposition of the bromate compound in the composition; (d) optionally, an anionic surfactant, wherein the surfactant when present is at a concentration of up to 4 percent by weight in the halide-based oxidizer chemistry; and (e) deionized water; wherein the halide in said halide-based aqueous polishing slurry composition consists of said bromide compound and said bromate compound.