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

Claim 11:
12. A method for planarization of a substrate, the method comprising:
exposing a polymer layer of a substrate to a first polishing process, the first polishing process comprising:
polishing the substrate with a grinding slurry and a polishing pad, the grinding slurry comprising a first plurality of colloidal particles having a grit size between about 5 μm and about 55 μm, the first plurality of colloidal particles comprising ferric oxide (Fe2O3), diamond (C), or boron nitride (BN);

exposing the polymer layer of the substrate to a second polishing process, the second polishing process comprising:
polishing the substrate with a polishing slurry and the polishing pad, the polishing slurry comprising a second plurality of colloidal particles having a grit size between about 20 nm and about 500 nm.