Patent ID: 7802917
Filing Date: 2010-09-28
Classification: H01L

Abstract:
1. A method for controlling wafer temperature during a wafer fabrication process, comprising: generating a thermal calibration curve for a chuck by, determining a target value for the thermal characterization parameter of the chuck to be used to hold a wafer during a wafer fabrication process; examining the generated thermal calibration curve for the chuck to determine a backside gas pressure value corresponding to the target value of the thermal characterization parameter of the chuck, wherein the backside gas pressure corresponds to a pressure of a gas applied at an interface between the wafer and the chuck; setting the backside gas pressure to the value corresponding to the target value of the thermal characterization parameter of the chuck; and maintaining the backside gas pressure substantially constant during an entirety of the wafer fabrication process so as to control a temperature of the wafer during the wafer fabrication process.