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Elastic properties of indium tin oxide films

Identifieur interne : 011446 ( Main/Repository ); précédent : 011445; suivant : 011447

Elastic properties of indium tin oxide films

Auteurs : RBID : Pascal:02-0142029

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English descriptors

Abstract

The Brillouin light scattering (BLS) technique is used to observe thermally excited acoustic surface phonons in backscattering geometry. A series of DC sputtered ITO films with thicknesses ranging from 31 to 3600 nm were deposited at a substrate temperature of 150°C on hydrogen terminated (100) silicon. From the dispersion of the Rayleigh mode and of the higher order Rayleigh-like modes in the discrete part of the spectrum, three independent stiffness constants, c11, c33 and c55, are determined with reasonable accuracy. These results are obtained using a hexagonal model, which takes the axial symmetry of the film material into account. The elastic anisotropy, c11/c33 ≃ 5/4, is attributed to the single crystal anisotropy of the strongly textured ITO. The Young's moduli obtained from BLS and a microindentation analysis are in good agreement.

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Pascal:02-0142029

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<div type="abstract" xml:lang="en">The Brillouin light scattering (BLS) technique is used to observe thermally excited acoustic surface phonons in backscattering geometry. A series of DC sputtered ITO films with thicknesses ranging from 31 to 3600 nm were deposited at a substrate temperature of 150°C on hydrogen terminated (100) silicon. From the dispersion of the Rayleigh mode and of the higher order Rayleigh-like modes in the discrete part of the spectrum, three independent stiffness constants, c
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<sub>33</sub>
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<sub>11</sub>
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<sub>33</sub>
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<sub>33</sub>
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