Patent ID: 11942343
Assignee: ADVANCED ION BEAM TECHNOLOGY, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C  G | IPC C  G  H

Claim 0:
1. A method for controlling wafer temperature in an ion implantation system having an ion implanter and a processing station, the method comprising:
implanting a wafer with ions from an ion beam while maintaining the wafer at a first predetermined temperature within a processing chamber of the ion implanter;
heating the wafer at the processing station with one or more infrared heating lamps;
ceasing to heat the wafer by turning off the one or more infrared heating lamps;
after turning off the one or more infrared heating lamps, at the processing station:
directing a laser beam from a laser source to a predefined location on the wafer; and
detecting, using a monochromator, fluorescent light emitted by the wafer in response to absorbing laser energy of the laser beam;

determining an intensity profile of the detected fluorescent light;
determining a current temperature of the wafer based on one or more characteristics determined from the intensity profile; and
in accordance with the determined current temperature of the wafer satisfying a predetermined condition:
forgoing continuing heating the wafer at the processing station; and
removing the wafer from the processing station.