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11 December 2002 Optical properties of porous titanium doixide
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Proceedings Volume 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals; (2002) https://doi.org/10.1117/12.486674
Event: XV International School on Spectroscopy of Molecules and Crystals, 2001, Chernivsti, Ukraine
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.
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Vladimir Ya. Gayvoronsky, O. Loginenko, R. Didenko, A. Galas, V. Reznichenko, M. I. Strashnikova, Thomas Dittrich, and V. Duzhko "Optical properties of porous titanium doixide", Proc. SPIE 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals, (11 December 2002); https://doi.org/10.1117/12.486674
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