Patent ID: 8900982

Claim:
A method for processing a substrate, the method comprising: disposing a mask between an ion source and the substrate, the mask comprising one or more first apertures disposed in a first row and one or more second apertures disposed in a second row, each row extending along a width direction of the mask, wherein the one or more first apertures and the one or more second apertures have non-uniform alignment along a height direction of the mask; directing an ion beam toward an upper part of the mask so as to overlap a first part of the ion beam with at least a portion of the one or more first apertures and a second part of the ion beam with at least a portion of the one or more second apertures; translating at least one of the mask and the substrate relative to the other one of the mask and the substrate along the height direction of the mask while the ion beam is being directed toward the upper part of the mask; and implanting the substrate with ions passing through the one or more first apertures and with ions passing through the one or more second apertures.