Patent ID: 11932934
Assignee: APPLIED MATERIALS, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 15:
16. A physical vapor deposition method comprising:
positioning a substrate having a substrate surface on a pedestal in a magnetron physical vapor deposition chamber, the magnetron physical vapor deposition chamber comprising a magnetron assembly comprising a rotatable drive shaft having a location that is aligned with a central axis of the chamber, the location of the rotatable drive shaft fixed with respect to the central axis of the chamber, a plurality of magnets that are coupled to a magnet support member connected to the rotatable drive shaft to rotate around the central axis, a first energy source comprising a first RF bias power source to provide RF power to a target assembly comprising a carbon target at a first frequency, and a second energy source comprising a second RF bias power source to provide RF power to the target assembly at a second frequency, the second frequency different than the first frequency;
depositing a film comprising carbon on the substrate surface by generating a deposition plasma at a deposition pressure less than or equal to about 40 mtorr in the chamber, depositing the film creates particulates in the plasma; and
decreasing particulates falling on the substrate surface by increasing pressure in the chamber to a particulate purge pressure greater than or equal to about 70 mtorr to agglomerate particulates in the plasma and move the agglomerated particulates to an outer portion of the physical vapor deposition chamber, wherein the pedestal is biased during deposition and at the particulate purge pressure, wherein moving the agglomerated particulates comprises increasing the frequency of the bias applied to the pedestal to create a charge on at least some of the particulates to form charged particulates, and increasing the frequency creates a trapping force that decreases an amount of time for the charged particulates to discharge.