Patent ID: 7745804

Claim:
An ion implantation method for achieving angular uniformity throughout a workpiece being implanted, comprising: providing an ion beam comprising at least one beamlet and mapping said workpiece to an imaginary planar coordinate system, wherein each of said beamlets strikes said workpiece surface with a corresponding incident angle whereby contributing to the intensity of said ion beam upon striking said workpiece, and said coordinate system has a first axis along a first direction and a second axis along a second direction; implanting said workpiece using said ion beam; rotating said workpiece by an angle of p degrees around an axis perpendicular to both said first direction and second direction; and repeating said implantation and rotation steps (n-1) times such that the product of n and p (n×p) is equal to 360 degrees thereby completing the ion implantation process, wherein for each implantation step, the contribution to said ion beam intensity by each said beamlet at its incident angle is rendered substantially the same from said first and second direction.