Patent ID: 8852964
Filing Date: 2014-10-07
Classification: H01J,H01L

Abstract:
1. A method of controlling CD uniformity of features of a wafer in a plasma processing system, the system having a wafer support assembly including a plurality of independently controllable temperature control zones arranged in proximity to device die locations above the temperature control zones on the wafer, and a controller that controls each temperature control zone, the method comprising: receiving process control and temperature data associated with at least one wafer previously processed in a plasma chamber of the plasma processing system; receiving critical device parameters of a wafer currently inserted in the plasma chamber; calculating a target trim time and a target temperature profile of the current wafer to be processed based on the process control and temperature data of the at least one previously processed wafer and the critical device parameters of the current wafer; and processing the current wafer for a duration of the target trim time where the temperature of each device die location is adjusted based on the target temperature profile.