Patent ID: 6576914
Filing Date: 2003-06-10
Classification: B82Y,H01J

Abstract:
A stencil reticle for a projection particle beam lithography system comprising:more than one set of subfields, for use with the same type of resist, formed from a blocking material and collectively representing a pattern of a layer of an integrated circuit, said pattern including at least one closed area in which a central blocking area that is not to be exposed on a wafer and is surrounded by an open area that is to be exposed, said open area being disposed within a blocking region; in which at least one set of said more than one set of subfields includes n subfields, where n is an integer greater than one, each having a central blocking portion of said blocking material attached to a blocking region of said blocking material by at least two supporting struts of said blocking material, each subfield further being exposed by one nth of an exposing dose of particles; and in each said subfield of said n subfields, said at least two supporting struts being located in different locations of said open area relative to each other of said n subfields, whereby each of said struts blocks only one nth of said exposing dose of particles.