Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.110: Poster
Donnerstag, 17. März 2011, 18:00–21:00, P4
Optical properties of ZnO/ZnMgO nanowire heterostructures — •Nils Neubauer1, Bingqiang Cao2, Marius Grundmann2, and Frank Cichos1 — 1Molecular Nanophotonics Group, University of Leipzig, Linnéstraße 5, 04103 Leipzig — 2Semiconductor Physics Group, University of Leipzig, Linnéstraße 5, 04103 Leipzig
ZnO nanowires are promising candidates for the fabrication of nanoscaled light emitting devices. Due to the large energy bandgap and exciton binding energy of ZnO, it offers the possibility for nanoscale light emitters in the UV spectral region working at room temperature. Pulsed laser deposition (PLD) enables the growth of defined nanowire shapes and nano-heterostructures to modify their optical properties. Due to quantum confinement effects in such heterostructures even single-photon emission is possible, a key requirement for future communication technologies like quantum cryptography. We have investigated ZnO nanowires with a radial and axial ZnO/ZnMgO quantum well heterostructure. These core/shell nanostructures were grown by a two step PLD process, which leads to a low area-density of the nanowires to provide homogeneous growth of the quantum well heterostructures. Optical studies were carried out in a photoluminescence setup. Excitation is done with a frequency quadrupled Nd:YVO4 laser in a TIRF (Total Internal Reflection Fluorescence) configuration. The emitted light is collected confocally and is detected in a Hanbury Brown-Twiss setup to study photon correlations.