Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 50: Poster II

HL 50.71: Poster

Thursday, March 30, 2006, 16:30–19:00, P3

Transport investigation on ZnO Nanowires — •T. Lüdtke¹, J. M. Becker¹, R. J. Haug¹, M. Kreye², and A. Waag² — ¹Institut für Festkörperphysik, Universität Hannover, D-30167 Hannover — ²TU-Braunschweig, D-38106 Braunschweig

We report on fabrication and transport measurements on ZnO nanowires. The nanowires are grown vertically onto a highly doped SiO₂ substrate and have a diameter of 50nm - 200nm and a length up to 2µ m. We use a method to contact this array of nanowires vertically. The sample is completely coated with an insulating polyimid whereas the tips of some wires are uncovered in several etching steps. Gold pads of a few tenth µ m are located above the uncovered tips to connect the wires to leads.

The sample is measured inside a He⁴ cryostat allowing temperatures down to 1.5 K and magnetic fields up to 15T. I-V characteristics shows an asymmetric diode like behaviour and the current rises while increasing the temperature. By illuminating the sample the conductivity is increasing by a factor of 2. Further temperature dependent measurements have been performed to analyze possible piezoelectric effects of the ZnO.