Patent ID: 6895360
Filing Date: 2005-05-17
Classification: B24B,G01B

Abstract:
1. A method for determining a material layer thickness transmissive to infrared (IR) energy in a semiconductor wafer manufacturing process comprising the steps of: providing at least one semiconductor wafer comprising an IR transmissive layer; passing IR energy through the IR transmissive layer to produce at least one Fourier transform infrared (FTIR) spectrum; and, determining an amount of the IR transmissive layer present according to an amount of IR energy absorbed by a predetermined contributing characteristic vibrational mode portion of the FTIR spectrum, which comprises at least one bandwidth of frequencies characteristic of an atomic bond vibrational mode of the IR transmissive layer, said predetermined contributing characteristic vibration mode portion is determined according to a deconvoluted peak area representing absorbance corresponding to the at least one bandwidth of frequencies.