Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 90: Poster Session: Quantum information systems; Optical properties; Ultrafast phenomena
HL 90.3: Poster
Donnerstag, 14. März 2013, 16:00–20:00, Poster A
Temperature dependent dielectric function of yttria stabilized zirconia and alumina — •Tobias Lühmann, Tammo Böntgen, Helena Franke, Rüdiger Schmidt-Grund, and Marius Grundmann — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstraße 5, 04103 Leipzig
We present the dielectric function (DF) of yttria stabilized zirconia (YSZ) and Al2O3 thin films in the spectral range 1 - 7.5 eV for temperatures between 10 K and room temperature. The DF spectra of the pulsed laser deposited thin films where obtained by means of spectroscopic ellipsometry with subsequent layer model analysis using model dielectric functions. Special attention is devoted to differences in the absorption properties in the near band gap spectral range for films grown at low and high temperature, respectively. It was found that the structural properties, and thus the absorption properties, differ considerably. The low temperature grown materials are found to be amorphous whereas the high temperature grown films are nano-crystalline.
The near band gap absorption properties of these materials have great impact on the usability of these materials for dielectric mirrors, so-called distributed Bragg reflectors, which are used in ZnO-based microcavities [1].
[1] H. Franke, C. Sturm, R. Schmidt-Grund, G. Wagner, and M. Grundmann, New J. Phys. 14, 013037 (2012).