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

Claim 9:
10. 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 or cooling the wafer at the processing station;
after heating or cooling the wafer, at the processing station:
directing a laser beam from a laser source to a predefined location on an edge extending between a top surface of the wafer and a bottom surface of the wafer, wherein a size of a spot of the laser beam is smaller than a thickness of the wafer and wherein the thickness of the wafer is equivalent to a length of the edge;
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; and
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 to heat or cool the wafer at the processing station; and

removing the wafer from the processing station.