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Infrared ellipsometry investigation of SiO x N y thin films on silicon

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Abstract

The dielectric function ɛ˜( ɛ˜ = ɛ1 + iɛ2) of silicon oxynitride films deposited on silicon wafers by dual ion-beam sputtering is determined by infrared ellipsometry between 580 and 5000 cm−1. The phase-separation model is unable to reproduce the experimental data. The dependence of ɛ˜ on stoichiometry is analyzed with the microscopic Si-centered tetrahedron model. The random-bonding model with five SiO4− jNj (j = 0–4) tetrahedra gives a good description of the spectra, provided the dielectric function of the mixed tetrahedra is carefully chosen.

© 1996 Optical Society of America

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