Patent ID: 7883909

Claim:
A method for measuring ion beam angle with respect to a substrate, comprising: providing a plurality of shadowing structures extending substantially perpendicular from an upper surface of the substrate; tilting the substrate at a known angle relative to a first position; directing an ion beam toward the tilted substrate at an incident angle offset from normal to the substrate first position, the plurality of shadowing structures interrupting the ion beam to define implanted and non-implanted portions of the substrate; measuring the dose of implanted species within the substrate; determining an implanted surface area as a function of measuring the dose of implant; determining non-implanted surface area based on the implanted surface area; and obtaining the ion beam angle offset from normal to the substrate first position as a function of the non-implanted surface area and the known angle; wherein providing the plurality of shadowing structures comprises providing a plurality of regions of differently oriented shadowing structures and a region free of the plurality of shadowing structures; and wherein providing the plurality of regions of differently oriented shadowing structures comprises providing a first series of spaced shadowing structures oriented parallel to an x-axis of the substrate in a first region, and a second series of spaced shadowing structures oriented parallel to a y-axis of the substrate in a second region.