Predicting pattern critical dimensions in a lithographic exposure process
First Claim
Patent Images
1. A method of predicting pattern critical dimensions in a lithographic exposure process, comprising:
- defining relationships between critical dimension, defocus, and dose;
performing at least one exposure run in creating a pattern on a wafer;
creating a dose map;
creating a defocus map; and
predicting, by a computer device, pattern critical dimensions based on the relationships, the dose map, and the defocus map,wherein the dose map is created based on dose integrator data; and
the defocus map is created based on wafer table direct interferometer data, total field deviation data, and focus correction data.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for predicting pattern critical dimensions in a lithographic exposure process includes defining relationships between critical dimension, defocus, and dose. The method also includes performing at least one exposure run in creating a pattern on a wafer. The method also includes creating a dose map. The method also includes creating a defocus map. The method also includes predicting pattern critical dimensions based on the relationships, the dose map, and the defocus map.
28 Citations
29 Claims
-
1. A method of predicting pattern critical dimensions in a lithographic exposure process, comprising:
-
defining relationships between critical dimension, defocus, and dose; performing at least one exposure run in creating a pattern on a wafer; creating a dose map; creating a defocus map; and predicting, by a computer device, pattern critical dimensions based on the relationships, the dose map, and the defocus map, wherein the dose map is created based on dose integrator data; and the defocus map is created based on wafer table direct interferometer data, total field deviation data, and focus correction data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A system for predicting pattern critical dimensions in a lithographic exposure process, comprising:
a computing device configured to; create a dose map and a defocus map based on data from at least one exposure run that creates a pattern on a wafer; and predict pattern critical dimensions based on the dose map, the defocus map, and predetermined relationships between critical dimension, defocus, and dose, wherein the dose map is created based on dose integrator data; and the defocus map is created based on a vector sum of topography target errors, stage trajectory errors, and image plane excursions. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
23. A computer program product comprising program code stored in a computer readable medium that, when executed on a computing device, causes the computing device to:
-
create a dose map and a defocus map based on data from at least one exposure run that creates a pattern on a wafer; and predict pattern critical dimensions based on the dose map, the defocus map, and predetermined relationships between critical dimension, defocus, and dose, wherein the dose map is created based on dose integrator data; and the defocus map is created based on a vector sum of topography target errors, stage trajectory errors, and image plane excursions. - View Dependent Claims (24, 25, 26, 27, 28, 29)
-
Specification