Patent ID: 11961708
Assignee: NUFLARE TECHNOLOGY, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 5:
6. A charged particle beam writing method that writes a pattern on a substrate on a stage by causing a deflector to deflect a charged particle beam, the charged particle beam writing method comprising:
virtually dividing a writing region of the substrate in a mesh-like manner and calculating a pattern density distribution indicating an arrangement ratio of the pattern for each mesh region;
calculating a dose distribution indicating a dose for each mesh region using the pattern density distribution;
calculating an exposure amount distribution of the charged particle beam, to which the substrate is exposed, using the pattern density distribution and the dose distribution;
calculating a plurality of fogging charged particle amount distributions by convoluting each of a plurality of distribution functions for fogging charged particles with the exposure amount distribution, the plurality of distribution functions having different distribution centers and radius of influence of a fogging effect from each other;
calculating a charge amount distribution due to direct charge using the pattern density distribution, the dose distribution, and the exposure amount distribution, and calculating a plurality of charge amount distributions due to fogging charge using the plurality of fogging charged particle amount distributions;
calculating a position shift amount of a writing position based on the charge amount distribution due to direct charge and the plurality of charge amount distributions due to fogging charge;
correcting an exposure position using the position shift amount; and
exposing the corrected exposure position to a charged particle beam.