Patent ID: 8449174
Filing Date: 2013-05-28
Classification: H01L

Abstract:
1. A method for performing a thermal calibration of a chuck, comprising: (a) supporting a wafer on the chuck in exposure to a heat source; (b) applying a gas at a substantially constant pressure at an interface between the wafer and the chuck; (c) removing the heat source; (d) measuring a temperature of the wafer as a function of time following removal of the heat source while maintaining the applied gas pressure; (e) determining a chuck thermal characterization parameter value based on the measured temperature of the wafer as a function of time, wherein the determined chuck thermal characterization parameter value corresponds to the applied gas pressure; (f) repeating operations (a) through (e) for a number of different applied gas pressures; and (g) establishing a correlation between the determined chuck thermal characterization parameter values and corresponding gas pressures to generate a thermal calibration curve for the chuck.