Patent ID: 6815317
Filing Date: 2004-11-09
Classification: H01L

Abstract:
A method of fabricating an integrated circuit requiring a deep ion implantion in a semiconductor substrate comprising the steps of:providing a semiconductor substrate having an upper surface through which impurity ions are to be implanted; applying a thin, easily removed, scattered impurity ion capturing layer on said surface of the semiconductor substrate; applying a mask material adjacent said ion capturing layer to provide a mask with openings for passing implanted ions into the substrate, wherein the mask openings expose the ion capturing layer, the ion capturing layer extending across the entirety of each of the mask openings; implanting impurity ions of sufficient energy and dosage to implant the ions deep in the semiconductor substrate; and capturing by the ion capturing layer those ions directed into the mask material but scattered in the material and deflected at the edge of the mask opening into the opening.