Patent ID: 6940080
Filing Date: 2005-09-06
Classification: B82Y,H01J

Abstract:
1. A charged particle beam lithography system comprising: a charged particle beam emitter which generates a charged particle beam and which emits the charged particle beam to a wafer, the charged particle beam emitter emitting the charged particle beam at an acceleration voltage lower than a voltage causing a proximity effect that back scattered electrons generated from the wafer by irradiation of the charged particle beam influence an exposure amount of a pattern to be written close to an irradiation position of the charged particle beam; an illumination optical system which adjusts a beam radius of the charged particle beam; a cell aperture having a cell pattern of a shape corresponding to a desired pattern to be written; a first deflector which deflects the charged particle beam with an electric field so as to enter a desired cell pattern of the cell aperture, and which deflect the charged particle beam which passes through the cell pattern back to an optical axis thereof; a demagnification projection optical system which demagnifies the charged particle beam from the cell aperture with an electric field so as to form an image on the wafer; an illumination position adjusting unit which adjusts an illumination position of the charged particle beam so that the charged particle beam entering said demagnification projection optical system passes through a trajectory substantially symmetrical with respect to the optical axis in one of two planes which intersect at right angle on the optical axis; and a second deflector which deflects the charged particle beam from the cell aperture with an electric field and which scans the wafer with the charged particle beam.