Patent ID: 6677599
Filing Date: 2004-01-13
Classification: H01J

Abstract:
A method of uniformly implanting a wafer with an ion beam, the wafer of the type having a surface area in the form of a disk with a diameter and center, comprising the steps of:forming the ion beam in an elongated shape incident on the wafer, the shape having a length along a first axis smaller than the diameter, and a width shorter than the length along a second axis; translating the center of the wafer disk along a path intersecting the beam substantially parallel with the second axis at a non-uniform velocity which has a translation velocity profile relative to position of the beam across the wafer; and simultaneously rotating the wafer substantially about the center at a rotational velocity; said translation velocity profile and said rotational velocity being such that the ion beam implants the wafer with substantially uniform dose across the surface area of the wafer.