Patent ID: 7092096
Filing Date: 2006-08-15
Classification: H01L

Abstract:
1. A method of analyzing structural characteristics of sidewall spacers fabricated on a wafer, comprising the steps of: etching said sidewall spacers on said wafer using an etcher; providing a grating bar having a plurality of grating targets each comprising a gate electrode and a pair of dielectric spacers; generating a theoretical optical scatterometry spectrum by subjecting said grating targets to input light in optical scatterometry; generating an experimental optical scatterometry spectrum by subjecting said sidewall spacers to input light in optical scatterometry; comparing said experimental optical scatterometry spectrum to said theoretical optical scatterometry spectrum; and equating said structural characteristics of said sidewall spacers with said structural characteristics of said grating targets when said theoretical optical scatterometry spectrum substantially matches said experimental optical scatterometry spectrum.