Patent ID: 6503418
Filing Date: 2003-01-07
Classification: C09K

Abstract:
In a Chemical-Mechanical-Polishing (CMP) mixture present on the surface of an integrated circuit wafer while carrying out CMP on an integrated circuit copper metallization structure having a Ta barrier layer, said CMP mixture including,dissolved copper, dissolved tantalum, SiO2 particles; silica precipitate material and copper staining material; a slurry, said slurry including abrasive particles of silica suspended in an aqueous medium; and a copper corrosion inhibiting compound; the improvement comprising, said slurry including an organic additive selected from the group consisting of: polyvinyl alcohol (PVA), PVA-poly(vinyl acetate) co-polymer, PVA-polyethylene co-polymer, sorbitol, glycerol, polyacrylamide (PAA), ethylene glycol, di(ethylene glycol), poly(ethylene glycol) (PEG), glycerol ethoxylate (GEO), dimethylsiloxane-ethylene oxide co-polymer (DMSiO- EO), polyethylene oxide surfactants, perfluorinated analogs of polyethylene oxide surfactants, glycerol propoxylate (GPO), octylphenol polyethylene oxide, nonylphenol polyethlene oxide, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, N,N-diethylcyclohexylamine (DCA), and polyethyleneimine(PEI); said organic additive acting in said mixture to suppres chemical reactions between said silica, said copper, and said copper corrosion inhibiting compound, so that during siad CMP, the said silica precipitate material and the said copper staining material do not form visible residue on said integrated circuit.