Patent ID: 8735855
Filing Date: 2014-05-27
Classification: H01J

Abstract:
1. An ion beam irradiation method for use in an ion implanter comprising a beam deflection scanner that scans a wafer with an ion beam at a beam scan speed in an X direction, a beam parallelizing device, and a wafer mechanical scan device that moves the wafer at a wafer mechanical scan speed in a Y direction orthogonal to the X direction so as to irradiate the wafer with the ion beam, wherein the method comprises: setting multistage beam scan areas of the wafer in the Y direction for ion implantation and setting beam scan widths in the X direction in each of the multistage beam scan areas; changing a combination of the beam scan speed by the beam deflection scanner and the wafer mechanical scan speed by the wafer mechanical scan device as a function of each of the beam scan widths so as to keep a dose uniformity in the X direction; setting a same beam scan frequency to all of the multistage beam scan areas and automatically changing the wafer mechanical scan speed as a function of the change of the beam scan speed; and configuring the beam deflection scanner and the wafer mechanical scan device so that each of the multistage beam scan areas which are different in beam scan widths has a same dose amount of the ion beam, by using different combinations of the beam scan speed and the wafer mechanical scan speed.