Determination of microstructure related optical constants of titanium dioxide thin films using optical methods

Sang-Youl Kim; Hee Jung Kim; Hyun-Mo Cho; Yun Woo Lee

doi:10.1117/12.246228

16 August 1996 Determination of microstructure related optical constants of titanium dioxide thin films using optical methods

Sang-Youl Kim, Hee Jung Kim, Hyun-Mo Cho, Yun Woo Lee

Author Affiliations +

Proceedings Volume 2873, International Symposium on Polarization Analysis and Applications to Device Technology; (1996) https://doi.org/10.1117/12.246228
Event: International Symposium on Polarization Analysis and Applications to Device Technology, 1996, Yokohama, Japan

Abstract

Titanium dioxide films prepared by a conventional electron beam deposition, an ion assisted deposition (IAD) and a radio frequency (RF) sputtering deposition is studied, where optical methods of transmission, spectroscopic ellipsometry (SE) and a quantum mechanical dispersion relation are involved. The complex dielectric function of TiO₂ in film phase at the spectral range from 1.5 eV to 6.5 eV is obtained for the use of the reference data. From the SE analysis, it is found that IAD grown TiO₂ films and RF sputter grown TiO₂ films have lower void fraction (5 - 14%) compared to the conventional electron beam grown ones (19 - 24%). As the film thickness increases from 500 angstroms to 3200 angstroms, the packing density of TiO₂ films monotonically rises from 87% to 95% when prepared on c-Si substrate, but it varies from 86% to the maximum value of 91% near 2000 angstroms when prepared on vitreous silica substrate. Surface microroughness of TiO₂ films prepared by the conventional electron beam deposition is confirmed by atomic force microscopy images.

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Sang-Youl Kim, Hee Jung Kim, Hyun-Mo Cho, and Yun Woo Lee "Determination of microstructure related optical constants of titanium dioxide thin films using optical methods", Proc. SPIE 2873, International Symposium on Polarization Analysis and Applications to Device Technology, (16 August 1996); https://doi.org/10.1117/12.246228

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