NICKEL PHOSPHOROUS CMP COMPOSITIONS AND METHODS
First Claim
1. A chemical mechanical polishing (CMP) composition for planarizing a nickel phosphorus (NiP) substrate, the composition comprising a suspension of about 1 to about 20 percent by weight (wt %) of colloidal silica particles and about 0.3 to about 10 wt % of fused silica particles in an acidic aqueous carrier comprising a primary oxidizing agent that includes hydrogen peroxide;
- wherein the concentration of the fused silica particles is not more than about 100% of the concentration of the colloidal silica particles.
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Abstract
A chemical mechanical polishing (CMP) composition for planarizing a nickel phosphorus (NiP) substrate comprises a suspension of colloidal silica particles and fused silica particles in an acidic aqueous carrier containing hydrogen peroxide, in which the concentration of the fused silica particles is less than or equal to the concentration of the colloidal silica particles. In some embodiments, the CMP composition includes a primary complexing agent, a secondary complexing agent, and a metal ion such as ferric ion, which is capable of reversible oxidation and reduction in the presence of hydrogen peroxide and NiP.
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Citations
28 Claims
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1. A chemical mechanical polishing (CMP) composition for planarizing a nickel phosphorus (NiP) substrate, the composition comprising a suspension of about 1 to about 20 percent by weight (wt %) of colloidal silica particles and about 0.3 to about 10 wt % of fused silica particles in an acidic aqueous carrier comprising a primary oxidizing agent that includes hydrogen peroxide;
- wherein the concentration of the fused silica particles is not more than about 100% of the concentration of the colloidal silica particles.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 27)
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20. A chemical mechanical polishing (CMP) composition for planarizing a nickel phosphorus (NiP) substrate, the composition comprising a suspension of about 1 to about 10 wt % colloidal silica particles and about 0.3 to about 6 wt % fused silica particles in an acidic aqueous carrier containing about 0.3 to about 1.8 wt % hydrogen peroxide;
- about 50 to about 150 ppm of a metal ion selected from the group consisting of Fe3+, Fe2+, Co2+, Cu2+, Eu3+, Mn2+, Re7+, W6+, Mo5+ and Ir3+;
about 0.3 to about 6 wt % of a primary complexing agent; and
about 0.4 to about 2 wt % of a secondary complexing agent;
wherein the fused silica particles are present in at a concentration that is not more than about 100% of the concentration of the colloidal silica particles. - View Dependent Claims (21, 22, 23, 24, 25, 26, 28)
- about 50 to about 150 ppm of a metal ion selected from the group consisting of Fe3+, Fe2+, Co2+, Cu2+, Eu3+, Mn2+, Re7+, W6+, Mo5+ and Ir3+;
Specification