Patent ID: 6067154
Filing Date: 2000-05-23
Classification: G01N

Abstract:
A method for obtaining identification of a molecular composition of material at a selected site within a semiconductor topography, comprising:determining intended compositions and thicknesses of underlying layers fabricated below the selected site, wherein the determining is accomplished using knowledge of a preceding semiconductor fabrication process performed upon the semiconductor topography;selecting an analysis depth above which material in the topography is to be identified wherein the analysis depth is consistent with said compositions and thicknesses;setting a frequency of a monochromatic radiation source such that a penetration depth of radiation from the radiation source into the topography corresponds to the analysis depth;illuminating the selected site with radiation from the monochromatic radiation source;detecting intensities and frequency shifts of radiation scattered from an illuminated region of the topography; andcomparing the detected intensities and frequency shifts to standard spectra to obtain identification of the molecular composition of the material within the illuminated region.