Patent ID: 6433878
Filing Date: 2002-08-13
Classification: G03F

Abstract:
A method of determining optical mask corrections for photolithography, comprising the steps of:A. printing a plurality of grating patterns onto a wafer utilizing a mask comprising at least one grating, wherein each grating pattern within said plurality of grating patterns is associated with known photolithographic settings, B. illuminating independently said each grating pattern with a light source, so that light is diffracted off said each grating pattern, C. measuring said diffracted light utilizing scatterometry techniques to determine measured diffracted values, D. comparing said measured diffracted values to values in a library to determine a profile match, E. assigning a profile description to said each grating pattern based on said profile match, F. compiling a database of said profile descriptions for said plurality of grating patterns, and G. generating a set of rules by accessing said database of said profile description, wherein said rules are for mask design and correction.