Patent ID: 8296091
Filing Date: 2012-10-23
Classification: G01J,H01L

Abstract:
1. A process, comprising: placing a semiconductor wafer within a thermal processing chamber, the thermal processing chamber comprising a first temperature measuring device configured to detect thermal radiation emitted from the semiconductor wafer, the thermal processing chamber being in communication with a lamp heat source, the thermal processing chamber comprising a second temperature measuring device comprising at least one light source and at least one light detector, the at least one light source configured to be controlled independently from the lamp heat source, the second temperature measuring device configured to determine the temperature of the semiconductor wafer based on a temperature dependence of an optical property of the semiconductor wafer; detecting thermal radiation emitted from a first location on the semiconductor wafer with the first temperature measuring device, the first location being positioned at a first radial distance from the center of the semiconductor wafer; radiating light energy from the at least one light source onto a second location on the semiconductor wafer; and detecting the light energy transmitted through or reflected from the semiconductor wafer with the at least one light detector; wherein the second location is located at a second radial distance from the center of the semiconductor wafer, the difference between the first radial distance and the second radial distance being no greater than about 5 cm.