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Materials 2009, 2(3), 1388-1401; doi:10.3390/ma2031388
Article

Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition

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1 Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland 2 Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland 3 Ion Beam Physics, Paul Scherrer Institut and ETH Zurich, CH-8093 Zurich, Switzerland
* Author to whom correspondence should be addressed.
Received: 27 August 2009 / Revised: 17 September 2009 / Accepted: 21 September 2009 / Published: 22 September 2009
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Abstract

Perovskite-type N-substituted SrTiO3 thin films with a preferential (001) orientation were grown by pulsed laser deposition on (001)-oriented MgO and LaAlO3 substrates. Application of N2 or ammonia using a synchronized reactive gas pulse produces SrTiO3-x:Nx films with a nitrogen content of up to 4.1 at.% if prepared with the NH3 gas pulse at a substrate temperature of 720 °C. Incorporating nitrogen in SrTiO3 results in an optical absorption at 370-460 nm associated with localized N(2p) orbitals. The estimated energy of these levels is ≈2.7 eV below the conduction band. In addition, the optical absorption increases gradually with increasing nitrogen content.
Keywords: oxynitrides; strontium titanate; pulsed laser deposition; thin films; optical properties oxynitrides; strontium titanate; pulsed laser deposition; thin films; optical properties
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Marozau, I.; Shkabko, A.; Döbeli, M.; Lippert, T.; Logvinovich, D.; Mallepell, M.; Schneider, C.W.; Weidenkaff, A.; Wokaun, A. Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition. Materials 2009, 2, 1388-1401.

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