Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 97: ZnO

HL 97.2: Talk

Friday, March 15, 2013, 09:45–10:00, H16

Growth of ZnO nanowires for sensor applications — •Manfred Madel, Felix Senf, Teresa Baur, Martin Dickel, Simon Berke, Sebastian Bauer, Ingo Tischer, Benjamin Neuschl, Uwe Röder, and Klaus Thonke — Institut für Quantenmaterie / Gruppe Halbleiterphysik, Universität Ulm

ZnO nanowires with average diameter of 50   nm and length up to 10   µ m were grown by chemical vapour deposition and reveal suitability for sensor applications due to a large surface to volume ratio. Good crystal quality and excellent structural definition is shown by scanning electron microscopy, X-ray diffraction as well as by photo- and cathodoluminescence measurements. Photoconductivity measurements were performend either by direct contacting single pillars via a conductive atomic force microscope tip, or using interdigital structures, on which the wires were aligned by a dielectrophoresis method. The wires show a high sensitivity to light with a threshold for persistent photoconductivity of around 2.8  eV. Optical readout with a micro-PL setup shows a clear change of the signal intensity in different gas ambient atmospheres.