Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition
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Date
2009-09
Publication Type
Journal Article
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yes
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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.
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published
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Journal / series
Volume
2 (3)
Pages / Article No.
1388 - 1401
Publisher
MDPI
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Subject
Oxynitrides; strontium titanate; pulsed laser deposition; thin films; optical properties
Organisational unit
08619 - Labor für Ionenstrahlphysik (LIP) / Laboratory of Ion Beam Physics (LIP)
03421 - Wokaun, Alexander (emeritus)
02513 - Laboratorium für Anorganische Chemie / Laboratory of Inorganic Chemistry