Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 16: Functional Oxides
DS 16.1: Hauptvortrag
Dienstag, 26. Februar 2008, 17:00–17:30, H 2032
Zinc Oxide Nanostructures: Optical resonators and lasing — •Klaus Thonke1, Anton Reiser1, Martin Schirra1, Martin Feneberg1, Guenther M. Prinz1, Tobias Röder1, Rolf Sauer1, Johannes Fallert2, Felix Stelzl2, Heinz Kalt2, Stefan Gsell3, Matthias Schreck3, and Bernd Stritzker3 — 1Institut für Halbleiterphysik, Universität Ulm, D-89069 Ulm — 2Institut für Angewandte Physik, Universität Karlsruhe (TH), D-76128 Karlsruhe — 3Experimentalphysik IV, Universität Augsburg, D-86135 Augsburg
ZnO allows to grow a wide variety of nanostructures: Simple nano-clusters, -wool, ribbons, comb- and tree-like structures, tetrapods, pillars etc. All kinds of growth methods are used like metal-organic vapour phase epitaxy, molecular beam epitaxy, magnetron sputtering, pulsed laser deposition, vapour deposition with or without catalysts, electrodeposition, spray pyrolysis, or even simple wet chemistry methods. For application as sensors and optoelectronic devices nano-pillars are of special interest. Best structural quality and purity can be obtained with high temperature-processes around 900°C. We will show here examples of rather well-faceted hexagonal pillars grown on sapphire and silicon/iridium (fcc) substrates. Performing CL with high spatial resolution on as-grown single pillars we find UV light standing waves in pillars with appropriate diameters. These pillars show competing well-resolved spectral laser modes. Time-resolved measurements reveal the transition from spontaneous to stimulated emission and allow to study the electron-hole plasma driven lasing dynamics in more detail.