Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 28: ZnO: preparation and characterization I
HL 28.10: Vortrag
Mittwoch, 25. März 2009, 12:15–12:30, BEY 118
Magneto-optical studies of bound exciton complexes in homoepitaxially grown polar ZnO Epilayers — •J.-H. Schulze1, M. R. Wagner1, C. Rauch1, A. Hoffmann1, J. Sann2, S. Lautenschläger2, B. K. Meyer2, and A. Rodina3 — 1Technische Universität Berlin, Institut für Feskörperphysik, Herdenbergstraße 36, 10623 Berlin, Germany — 2Justus Liebig Universität Giessen, I. Physics Insitute, Heinrich-Buff-Ring 16, 35592 Giessen, Germany — 3A. F. Ioffe Physico-Technical Institute, 194021 St.-Petersburg, Russia
The optical properties of homoepitaxially grown ZnO are strongly influenced by the surface polarity of the substrate. This dependency is e.g. shown at the luminescence of complex bound excitons. Our investigations revealed excitonic recombination lines that could exclusively be observed from a sample grown on O-polar ZnO (PRB 77, 144108). In order to determine the complex properties of this excitons magneto-optical investigations are performed. The electron- and hole effective g-values of the involved complex are calculated from these measurements. To obtain information about the symmetry of the excitonic valence states angular resolved magneto-optical data is acquired. Temperature and power dependent PL measurements are done to get further insight into the explicit recombination behavior with respect to the fine structure splitting. In addition pico-second time resolved measurements reveal the recombination dynamics. These results are compared with the temperature and magnetic field dependent thermalization behavior. Possible defect models and energy level splittings are discussed and compared to theoretical models.