Patent ID: 7831953
Filing Date: 2010-11-09
Classification: G03F,G06F

Abstract:
1. A method for using a computer to modify a mask layout, the method including using a lithography simulation method which predicts a result that a pattern formed on a mask is transferred onto a sample by use of a simulation based on pattern data of the mask, comprising: acquiring, using the computer, a minimum periodic length of the mask layout, the periodic length being a length of a pattern included in the mask layout and a length of a space between the pattern and another adjacent pattern; setting a distance from end to end of a calculation portion of the pattern data used for the simulation in a periodic direction of the pattern data to an integral multiple of the acquired minimum periodic length of the mask layout; and subjecting the mask layout containing a pattern whose periodicity is disturbed to the simulation by use of the thus set calculation area wherein the subjecting the mask layout containing the pattern whose periodicity is disturbed to the simulation includes correcting the pattern by taking an optical proximity effect into consideration, and verifying whether the corrected pattern is finished with desired size on a sample, and the correcting the pattern and the verifying are performed again after at least one of an exposure condition and a mask CD is changed when the corrected pattern is not finished with the desired size on the sample.