Patent ID: 7049210

Claim:
A method of implanting a substrate, comprising a) generating an implant beam having a predetermined beam direction, b) orienting the substrate to a first orientation relative to the implant beam about an axis transverse to the plane of the substrate, c) in said first orientation, producing a first relative movement between the substrate and the beam both (i) in a first direction transverse to the beam direction to produce at least one pass of the beam over the substrate and (ii) in a second direction transverse to the beam direction and said first direction to produce a plurality of scans of the beam over the substrate during each said pass, whereby said scans draw on the substrate a first raster of lines having mid-points which have predetermined spacing in said first direction, d) orienting the substrate to a second said orientation at 180° about said axis to said first orientation, and e) in said second orientation, producing a second said relative movement between the substrate and the beam to draw on the substrate a second raster of lines which are interleaved with the lines of said first raster.