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Proceedings Paper

Optical properties of porous titanium dioxide
Author(s): Vladimir Ya. Gayvoronsky; O. Loginenko; R. Didenko; A. Galas; V. Reznichenko; M. I. Strashnikova; Thomas Dittrich; V. Duzhko
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Paper Abstract

This paper presents optical absorption spectra and refractive index dispersion curves of porous anatase thin layers on glass substrate. The results have been measured in the photon energy range 1,5-3,5 eV at room temperature. Estimated samples porosity is about 58 percent in framework of Bruggeman effective medium approximation. Indicatrix of diffusion was measured at 632.8 nm. Defects absorption gives the major contribution into transmitted light losses below the gap in comparison with scattering phenomena. We obtained optical band gaps for both direct -Eg = 3.69 eV and indirect transitions Eg = 3.42 eV. The Urbach tail width 180 meV obtained from the optical absorption measurements agrees with the magnitude of trap depth 185 meV from the conductivity temperature dependencies for the similar anatase nanocrystallines.

Paper Details

Date Published: 11 December 2002
PDF: 8 pages
Proc. SPIE 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals, (11 December 2002); doi: 10.1117/12.486674
Show Author Affiliations
Vladimir Ya. Gayvoronsky, Institute of Physics (Ukraine)
O. Loginenko, Institute of Physics (Ukraine)
R. Didenko, Institute of Physics (Ukraine)
A. Galas, Institute of Physics (Ukraine)
V. Reznichenko, Institute of Physics (Ukraine)
M. I. Strashnikova, Institute of Physics (Ukraine)
Thomas Dittrich, Technical Univ. of Munich (Germany)
V. Duzhko, Technical Univ. of Munich (Germany)

Published in SPIE Proceedings Vol. 4938:
Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals
Galina A. Puchkovska; Sergey A. Kostyukevych, Editor(s)

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