Patent ID: 6110626
Filing Date: 2000-08-29
Classification: G03F,H01J

Abstract:
A method for projection-transferring, with demagnification, a pattern defined by a mask onto a sensitive substrate, the method comprising:(a) providing a pattern divided into multiple subfields defining respective portions of the pattern, a subpopulation of the subfields individually defining at least one respective feature that cannot or may not be definable on a single respective mask subfield of a stencil mask;(b) determining, for each subfield in the subpopulation, whether to divide the respective subfield into first and second complementary subfields;(c) based on determinations made in step (b), dividing only those subfields requiring division, yielding a first population of undivided subfields and a second population of divided subfields, each divided subfield being represented in the second population by respective first and second complementary subfields;(d) on a mask substrate, forming a mask comprising all the first and second populations of subfields; and(e) passing a charged particle beam individually through the subfields of the mask formed in step (d) to form corresponding transfer subfields on a sensitive substrate.