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HL: Fachverband Halbleiterphysik

HL 48: ZnO: Devices

HL 48.10: Vortrag

Mittwoch, 16. März 2011, 12:45–13:00, POT 151

Synthesis and characterization of micro scaled free standing c-oriented piezoelectric ZnO needles — •Sören Kaps, Arnim Schuchardt, Yogendra Kumar Mishra, and Rainer Adelung — Functional Nanomaterials, Institute for Materials Science, University of Kiel, Kaiserstraße 2, 24143 Kiel

The combination of a piezoelectric and a magnetostrictive material on a microscopic scale allows the creation of magnetoelectric (ME) composites with a very high ME effect. For magnetic field sensors a freestanding ME composite has the advantage that no clamping of the composite is necessary and therefore no hindering of the deformation can occur. Since the preferred growth direction of ZnO is the c-axis which is also piezoelectric active and hence it becomes a potential candidate for building freestanding ME composites. The controlled growth and the piezoelectric properties of ME composites are highly important to realize ME composites by coating the ZnO with a magnetostrictive material. In the present work free standing ZnO needles with variable dimensions, have been synthesized by conventional vapor liquid solid (VLS) and a newly introduced flame transport synthesis (FTS) approach. The effect of different ZnO structures on piezoelectric properties will be discussed. Further the piezoelectric properties will be related to the electronic properties and it will be shown how reliable conductivity measurements can give a hint on the quality of the obtained structures.