Patent ID: 6420700
Filing Date: 2002-07-16
Classification: B82Y,H01J

Abstract:
A method of calibrating deflection efficiency in a charged-particle-beam exposure device having at least two deflectors including a main deflector deflecting a charged-particle beam in a first area and a sub-deflector deflecting said charged-particle beam in a second area defined within said first area, a deflection efficiency of said charged-particle beam for said sub-deflector being dependent on a deflection amount of said main deflector, said method comprising the steps of:a) positioning each of a plurality of position-detection marks near a boundary of said second area by moving a reference chip through stage movement, said reference chip having said position-detection marks at predetermined relative positions thereon; b) deflecting said charged-particle beam through said main deflector to a general center of said second area; c) detecting positions of said position detection marks by deflecting said charged-particle beam through said sub-deflector and detecting charged particles scattered by said position-detection marks; d) obtaining said deflection efficiency of said second area based on detected positions of said position-detection marks and information regarding said stage movement; and e) obtaining correction coefficients for correcting said deflection efficiency of said second area.