Mask pattern data creation method and mask
First Claim
1. A mask pattern data creation method for creating assist pattern feature data of a plurality of assist pattern features to be formed on a mask along with a plurality of main pattern features transferrable to a transfer destination by an exposure, the assist pattern features being not transferrable to the transfer destination, the method comprising:
- classifying the main pattern features into at least two groups in accordance with a minimum pitch between adjacent main pattern features;
determining, for a group having a smallest minimum pitch, whether a spacing between adjacent assist pattern features corresponding to main pattern features in the group is not more than a prescribed spacing, the determination being performed based on;
initial positions of the adjacent assist pattern features determined based on an illumination condition; and
initial sizes of the adjacent assist pattern features satisfying a size condition such that the adjacent assist pattern features are not transferrable to the transfer destination; and
adjusting, when it is determined that the spacing between the adjacent assist pattern features is not more than the prescribed spacing, at least one of the adjacent assist pattern features by at least one of changing its position or reducing its size, so as to increase the spacing between the adjacent assist pattern features to exceed the prescribed spacing.
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Accused Products
Abstract
A mask pattern data creation method includes: determining whether or not a spacing of adjacent assist pattern feature data is not more than a prescribed spacing, based on: initial position data indicating an initially set position of the assist pattern feature data determined based on an illumination condition; and initial size data indicating an initially set size of the assist pattern feature data satisfying a size condition to not optically form an image on the transfer destination; and moving at least one of the adjacent assist pattern feature data or reducing a size of the at least one to increase the spacing of the assist pattern feature data to exceed a prescribed spacing in the case where it is determined that the spacing of the assist pattern feature data is not more than the prescribed spacing.
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Citations
15 Claims
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1. A mask pattern data creation method for creating assist pattern feature data of a plurality of assist pattern features to be formed on a mask along with a plurality of main pattern features transferrable to a transfer destination by an exposure, the assist pattern features being not transferrable to the transfer destination, the method comprising:
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classifying the main pattern features into at least two groups in accordance with a minimum pitch between adjacent main pattern features; determining, for a group having a smallest minimum pitch, whether a spacing between adjacent assist pattern features corresponding to main pattern features in the group is not more than a prescribed spacing, the determination being performed based on; initial positions of the adjacent assist pattern features determined based on an illumination condition; and initial sizes of the adjacent assist pattern features satisfying a size condition such that the adjacent assist pattern features are not transferrable to the transfer destination; and adjusting, when it is determined that the spacing between the adjacent assist pattern features is not more than the prescribed spacing, at least one of the adjacent assist pattern features by at least one of changing its position or reducing its size, so as to increase the spacing between the adjacent assist pattern features to exceed the prescribed spacing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12)
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10. A mask pattern data creation method for creating assist pattern feature data of a plurality of assist pattern features to be formed on a mask along with a plurality of main pattern features transferrable to a transfer destination by an exposure, the assist pattern features being not transferrable to the transfer destination, the method comprising:
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classifying the main pattern features into at least two groups in accordance with a minimum pitch between adjacent main pattern features; setting assist pattern feature arrangement regions for at least one of the adjacent main pattern features, according to the minimum pitch between the adjacent main pattern features; and setting positions and sizes of the assist pattern features associated with the assist pattern feature arrangement regions so that a spacing between adjacent assist pattern features is more than a prescribed spacing. - View Dependent Claims (13, 14, 15)
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Specification