Patent ID: 9721802
Date: 2017-08-01
CPC Classifications: C23F,H01J,H01L,H05K

Claim:
1. A substrate processing system, comprising: a substrate processing chamber having a substrate processing region surrounded by one or more chamber walls; a substrate support configured to support a substrate having a metal layer in the substrate processing region during a substrate processing operation; a gas delivery system configured to deliver one or more process gasses including an etching gas for etching the metal layer to the substrate processing region; a plasma source operatively coupled to the substrate processing chamber; a window positioned on one of the one or more chamber walls; a plurality of LEDs positioned outside the substrate processing chamber and configured to emit radiation into the chamber through the window, or positioned within the substrate processing chamber; a controller operatively coupled to the plasma source and the plurality of LEDs, the controller configured to generate a series of pulses for the plasma source and a series of pulses for the plurality of LEDs, wherein, in each clock period, a start of a pulse for the plurality of LEDs is during a pulse for the plasma source, and an end of the pulse for the plurality of LEDs is after the pulse for the plasma source; and a biasing system configured to apply a bias between the substrate and an electrode, wherein the controller is further configured to generate a series of pulses for the biasing system, and wherein, in each clock period, an end of a pulse for the biasing system is after the pulse for the plasma source but before the end of the pulse for the plurality of LEDs.