Polishing compositions for noble metals
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United States of America Patent
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Issued Date -
Aug 15, 2002
app pub date -
Dec 11, 2000
filing date -
Dec 14, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The polishing composition of this invention is useful for chemical mechanical polishing of substrates containing noble metals such as platinum and contains sulfur-containing compounds at about 0.1% to 50% by weight of the polishing composition, abrasive particles at about 0.5% to about 55% by weight of the polishing composition and water-soluble organic additives up to about 10% by weight of the polishing composition. The abrasive particles are selected from the group consisting of alumina, ceria, silica, diamond, germania, zirconia, silicon carbide, boron nitride, boron carbide or mixtures thereof. The organic additives improve dispersion of the abrasive particles and also enhance metal removal rates and selectivity for metal removal by stabilizing the pH of the polishing composition and suppressing the dielectric removal rate.
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