Patent ID: 9224578
Filing Date: 2015-12-29
Classification: G03F,H01J

Abstract:
1. A charged particle beam writing apparatus comprising: a first mesh division unit configured to virtually divide a pattern writing region of a target object into a plurality of first mesh regions in a first mesh size; a second mesh division unit configured to virtually divide the pattern writing region of the target object into a plurality of second mesh regions in a second mesh size obtained by dividing the first mesh size by a product of a natural number and a number of passes of multiple pattern writing performed by shifting a position; a first dose operation unit configured to operate a first dose of a charged particle beam corrected for a proximity effect for each of the plurality of second mesh regions by using a dose model using a dose threshold; a representative temperature operation unit configured to operate a representative temperature of the first mesh region rising due to heat transfer originating from irradiation of the charged particle beam by using a dose for an applicable pass of the multiple pattern writing of the first dose operated, for each pass of the multiple pattern writing and each of the plurality of first mesh regions; a polynomial operation unit configured to operate a polynomial having a term obtained by multiplying a dose modulation coefficient based on the representative temperature of each pass by a pattern area density for each of the plurality of second mesh regions as an element; and a pattern writing unit configured to write a pattern on the target object by using a charged particle beam of a dose that makes a difference between a value obtained by operating the polynomial and the dose threshold within a tolerance.