Patent ID: 9366601
Filing Date: 2016-06-14
CPC Classification: G01N,H01L

Claim Text:
1. A method of characterizing a patterned wafer, comprising: receiving a wafer having undergone a semiconductor fabrication patterning process, the wafer comprising a waveguide; performing multiple-internal reflection (MIR)-infrared (IR) spectroscopy by irradiating a first angled surface of the wafer using an IR source to achieve internal reflection within the waveguide of the wafer and detecting IR transmission/absorption in the waveguide from radiation exiting a second angled surface of the wafer using an IR detector; processing a signal received by the IR detector in a computer system to provide an absorbance spectra; and analyzing the absorbance spectra to provide a characterization of material on the wafer having undergone the semiconductor fabrication process.