Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 41: Heterostructures, interfaces, and surfaces
HL 41.3: Talk
Thursday, April 4, 2019, 15:30–15:45, H31
Strain study of piezotronic ZnO microstructures utilising X-ray nanodiffraction techniques — Philipp Jordt1, Stjepan Hrkac2, Niklas Wolff3, Mona Mintken3, •Christina Krywka4, Rainer Adelung3, Lorenz Kienle3, Olaf Magnussen1, and Bridget Murphy1 — 1Institut für Experimentelle und Angewandte Physik, Kiel University, Germany — 2UC San Diego, CA, USA — 3Technische Fakultät, Kiel University, Germany — 4Zentrum für Material- und Küstenforschung, Helmholtz-Zentrum Geesthacht, Germany
Combining piezoelectric/piezotronic and magnetostrictive materials is one promising approach to design bio magnetic field sensors to detect magnetic signals from the human body. To achieve the extreme sensitivity of less than 100 pT required for medical applications, is a challenge. Piezotronic readout is possibility to increase the limit of detection. For piezotronic, the strain induced piezoelectric potential causes additional charges at the metal-semiconductor interface resulting in a change of height and width of the Schottky barrier. The charge carrier transport across the metal-semiconductor contact is therefore dependent on the piezoelectric charges, which can be controlled by the applied strain or vice versa. For this experiment we used ZnO micro wires with diameters between one and 100 microns. During the experiment we collected the current voltage curves of the sample and simultaneous applied a mechanical stress while observing key Bragg reflections. This nanofocus diffraction experiment provided unique spatially resolved lattice deformation during piezotronic measurements.