Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 38: ZnO I

HL 38.8: Vortrag

Donnerstag, 29. März 2007, 12:00–12:15, H17

Luminescence properties of ordered ZnO single crystal nanorod arrays — •Huijuan Zhou, Markus Wissinger, Johannes Fallert, Robert Hausschild, Felix Stelzl, Mario Hauser, Claus Klingshirn, and Heinz Kalt — Institut für angewandte Physik, Universität Karlsruhe (TH), Karlsruhe, Germany

ZnO is an important material for blue/ultraviolet (UV) light emitting diode or laser diode. The practical application depends to great extend on the crystal quality of ZnO. By a controlled vapor phase transportation growth method we have recently fabricated high quality ordered ZnO nanorod arrays, which may be promising candidates for UV emitting devices. The ZnO nanorods are [0001] oriented single crystals with diameter of 250-300 nm and length of 2.5-4.7 µm, perpendicularly grown on GaN substrate.

The luminescence properties of the nanorods are studied extensively. Low temperature measurements show well separated bound exciton and free A-exciton emission in the UV region of the spectra, indicating high sample quality. By using the combination of a confocal microscopy and a 50 fs Ti:Sapphire laser, time resolved micro-photoluminescence (µ-TRPL) spectra are measured on single nanorods. Power dependent measurements demonstrate lasing behavior of the rods.