Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 97: ZnO
HL 97.11: Vortrag
Freitag, 15. März 2013, 12:15–12:30, H16
Synchrotron based spectroscopic ellipsometry of MgZnO — •Maciej D. Neumann1, Christoph Cobet2, Martin Feneberg3, Rüdiger Goldhahn3, Jean-Michel Chauveau4, and Norbert Esser1 — 1Leibniz-Institut für Analytische Wissenschaften − ISAS − e.V., 12489 Berlin, Germany — 2Johannes Kepler Universität Linz, 4040 Linz, Austria — 3Otto-von-Guericke-Universität Magdeburg, 39106 Magdeburg, Germany — 4Centre de Recherche sur l’Hétéro-Epitaxie et ses Applications, 06565 Sophia Antipolis, France
Using a newly developed synchrotron VUV ellipsometer allowing variable angle of incidence studies, non-polar MBE grown MgZnO samples with Mg contents up to 45% were investigated in the photon energy range from 2 to 25 eV. For the first time, both the parallel and perpendicular components of the complex dielectric tensor are presented. The strength of optical anisotropy above 10 eV decreases continuously with increasing Mg content. It suggests that the optical transitions in this range are strongly related to the Zn-3d levels. The results are in remarkable agreement to novel ab-initio calculations.