Patent ID: 11931855
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 19:
20. A method for planarization of a substrate, the method comprising:
positioning a substrate in a polishing apparatus, the substrate comprising a polymeric material selected from the group consisting of polyimide, polyamide, parylene, and silicone;
exposing a polymer layer of a substrate surface of the substrate to a first polishing process, the first polishing process comprising:
delivering a grinding slurry to a polishing pad of the polishing apparatus, the polishing pad pressed against the substrate surface and rotated at a velocity between about 50 rotations per minute and about 100 rotations per minute, the grinding slurry comprising:
a first plurality of colloidal particles having a grit size between about 5 μm and about 20 μm and a weight percentage between about 2% and about 20%, the first plurality of colloidal particles comprising a material selected from the group consisting of ferric oxide (Fe2O3), diamond (C), and boron nitride (BN);
a non-ionic polymer dispersion agent comprising polyvinylpyrrolidone; and
an aqueous solvent, wherein the non-ionic polymer dispersion agent is mixed with the aqueous solvent in a ratio of about 1:1 v/v dispersion agent:aqueous solvent;

exposing the polymer layer of the substrate surface of the substrate to a second polishing process, the second polishing process comprising:
delivering a polishing slurry to the polishing pad of the polishing apparatus, the polishing slurry comprising:
a second plurality of colloidal particles having a grit size between about 25 nm and about 200 nm and a weight percentage between about 1% and about 25%, wherein the second plurality of colloidal particles are formed from a different material than the material of the first plurality of colloidal particles; and

recycling the first and second pluralities of colloidal particles to reform the grind slurry and the polishing slurry.