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Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition
Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
Ion Beam Physics, Paul Scherrer Institut and ETH Zurich, CH-8093 Zurich, Switzerland
* Author to whom correspondence should be addressed.
Received: 27 August 2009; in revised form: 17 September 2009 / Accepted: 21 September 2009 / Published: 22 September 2009
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
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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.
Marozau I, Shkabko A, Döbeli M, Lippert T, Logvinovich D, Mallepell M, Schneider CW, Weidenkaff A, Wokaun A. Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition. Materials. 2009; 2(3):1388-1401.
Marozau, Ivan; Shkabko, Andrey; Döbeli, Max; Lippert, Thomas; Logvinovich, Dimitri; Mallepell, Marc; Schneider, Christof W.; Weidenkaff, Anke; Wokaun, Alexander. 2009. "Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition." Materials 2, no. 3: 1388-1401.