Patent ID: 6217212
Filing Date: 2001-04-17
Classification: B24B,H01L,Y10S

Abstract:
A method for detecting an incorrect position of a semiconductor wafer during a high-temperature treatment of the semiconductor wafer in a quartz chamber which is heated by IR radiators, the semiconductor wafer lying on a rotating support comprisingmeasuring the temperature of the semiconductor wafer and controlling the temperature of the semiconductor wafer as to hold the semiconductor wafer at a specific temperature;recording thermal radiation which is emitted by the semiconductor wafer using a pyrometer, said thermal radiation having components which emanate from the IR radiators and are reflected by the semiconductor wafer;determining a radiation temperature of the recorded thermal radiation; andestimating the wafer lying in an incorrect position if said radiation temperature of said recorded thermal radiation fluctuates to such an extent over time that the fluctuation has an amplitude which lies outside a temperature fluctuation range .DELTA.T which is considered as being permissible.