Patent ID: 9679739
Date: 2017-06-13
CPC Classifications: H01J

Claim:
1. An ion implantation system, comprising: an ion source and extraction assembly configured to generate an ion beam; a mass-analysis magnet assembly configured to mass resolve the ion beam; a mass resolving aperture positioned downstream of the mass-analysis magnet assembly, wherein the mass resolving aperture is configured to filter undesirable species from the ion beam, and wherein the ion beam generally diverges after passing through the mass resolving aperture; a combined electrostatic lens system positioned downstream of the mass-analysis magnet assembly, wherein a path of the ion beam is deflected and contaminants are generally filtered out of the ion beam, while concurrently decelerating and parallelizing the ion beam, wherein the combined electrostatic lens system comprises a plurality of electrodes including a top terminal suppression electrode and a bottom terminal suppression electrode, wherein a curvature of a downstream edge the top terminal suppression electrode differs from a curvature of a downstream edge of the bottom terminal suppression electrode; and a workpiece holder and translation system positioned downstream of the combined electrostatic lens system and configured to selectively translate a workpiece in one or more directions through the ion beam.