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

Materials

Ivan Marozau²  Andrey Shkabko¹  Max Dli³  Thomas Lippert²  Dimitri Logvinovich¹  Marc Mallepell³  Christof W. Schneider²  Anke Weidenkaff¹ 

[1] Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland; E-Mails:;Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland; E-Mails:;Ion Beam Physics, Paul Scherrer Institut and ETH Zurich, CH-8093 Zurich, Switzerland; E-Mails:

关键词: oxynitrides;    strontium titanate;    pulsed laser deposition;    thin films;    optical properties;   

DOI  :  10.3390/ma2031388

来源: mdpi

【 摘 要 】

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 SrTiO_3-x:N_x 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.

【 授权许可】

CC BY   
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.