Patent ID: 11967486
Assignee: LAM RESEARCH CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A substrate processing system, comprising:
an upper chamber;
a gas delivery system to supply a gas mixture to the upper chamber;
an RF generator to generate plasma in the upper chamber;
a lower chamber including a substrate support; and
a dual ion filter arranged between the upper chamber and the lower chamber, the dual ion filter including:
an upper filter including a first plurality of through holes configured to filter ions; and
a lower filter including a second plurality of through holes configured to control plasma uniformity;

wherein a diameter of the first plurality of through holes of the upper filter is less than a diameter of the second plurality of through holes of the lower filter; and
wherein a number of the first plurality of through holes of the upper filter is greater than a number of the second plurality of through holes of the lower filter.