Patent ID: 8164068
Filing Date: 2012-04-24
Classification: H01J,H01L,Y02E,Y02P

Abstract:
1. A method for aligning a mask in an ion implanter comprising: directing an ion beam through a plurality of apertures of a mask toward a platen configured to support a target substrate; disposing an ion current measurement device, behind said mask, in a substantially co-planar relationship with respect to said target substrate as if said substrate is positioned on said platen; translating the ion current measurement device across said ion beam; recording the position of the ion current measurement device as it translates across said ion beam; measuring a current of the ion beam directed through the plurality of apertures of the mask using the ion current measurement device at the recorded positions; generating a current signal in response to the measured ion beam current from the ion current measurement device at each of the recorded positions; transmitting the current signal to a controller; and generating a control signal by said controller used to position at least one of the ion beam or the mask based on the control signal such that a mean ion beam angle is centered with respect to a center one of the plurality of apertures of the mask.