Patent ID: 9466466
Filing Date: 2016-10-11
CPC Classification: H01J,H01L

Claim Text:
1. A method comprising: identifying an operation of a recipe for processing a substrate within a chamber, the operation being configured to provide a pulsed radio frequency (RF) to the chamber; performing a plurality of tests in the chamber for the operation utilizing the pulsed RF, each test having a duty cycle for the pulsed RF selected from a plurality of RF duty cycles; for each test, measuring a critical dimension (CD) value and a critical dimension uniformity (CDU) value for features in the substrate; identifying a first range of duty cycles that corresponds to a range of CD values that includes a minimum CD value from the measured CD values in the plurality of tests; identifying a second range of duty cycles that corresponds to a range of CDU values that includes a minimum CDU value from the measured CDU values in the plurality of tests; selecting a first duty cycle from an overlap of the first range of duty cycles and the second range of duty cycles; and setting the selected first duty cycle in the operation of the recipe for processing the substrate.