Abstract
Nitrogen-doped titanium dioxide (TiO2) thin films were synthesized on glass substrates by reactive pulsed laser deposition technique (PLD). A frequency quadrupled Nd:YAG (λ = 266 nm, τFWHM ≅ 5 ns, ν = 10 Hz) laser source was used for the irradiations of TiO2 targets. The experiments were performed in controlled reactive atmosphere consisting of mixtures of oxygen and nitrogen gases. We demonstrated that there exists the possibility for the accurate control of the nitrogen incorporation through the growth parameters, i.e., the nitrogen partial pressure in the reaction enclosure. The substitutional nitrogen doping of the anatase phase TiO2 thin films allows for the continuous shift of the optical absorption edge towards the visible spectral range. When a threshold value of the nitrogen dopant level is surpassed the crystallization structure of the TiO2 anatase phase thin films changes, and the onset of a stable titanium-oxinitride phase formation takes place.
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Acknowledgments
Financial support from the European Union under the contract “Functionalized Advanced Materials Engineering of Hybrids and Ceramics” (FAME), NMP3-CT-2004-500159, the Catalan Government (Departament de Medi Ambient i Habitatge), SGR-0333 Grant is acknowledged with thanks. The authors acknowledge with many thanks the support and advice in performing the x-ray photoelectron spectroscopy investigations of Dr. Jordi Fraxedas, Centre d’Investigacions en Nanociència i Nanotecnologia, Barcelona, Spain and the Romanian National University Research Council Grant 863/2006.
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Sauthier, G., György, E. & Figueras, A. Investigation of nitrogen-doped TiO2 thin films grown by reactive pulsed laser deposition. Journal of Materials Research 23, 2340–2345 (2008). https://doi.org/10.1557/jmr.2008.0306
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DOI: https://doi.org/10.1557/jmr.2008.0306