Enhanced pressure response in ZnO nanorods due to spontaneous polarization charge

Seifikar, Masoud and O'Reilly, Eoin P. and Christian, Björn P. and Lebedev, Vadim and Volk, János (2016) Enhanced pressure response in ZnO nanorods due to spontaneous polarization charge. In: 15th International Conference on Nanotechnology. IEEE, Piscataway, N.J., pp. 1465-1468. ISBN 978-1-4673-8155-0

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Abstract

We present measurements of the induced charge flow when a compressive force is applied by contacting to a ZnO nanowire (NW). The measured charge transfer from the NW is over 104 times larger than expected from the strain-induced piezoelectric response, and is comparable in magnitude to the spontaneous polarization charge, associated with an ideal ZnO NW. A model is presented that compares the total energy of an isolated NW and external capacitor with the total energy when the capacitor and NW form a closed circuit. The analysis shows that it is possible, for realistic values of surface defect creation energy, to have spontaneous polarization charge transferred from a NW to an external capacitor when a circuit is completed between them. We propose that it is possible to use spontaneous polarization charge to get a significantly enhanced response in ZnO-based NW pressure sensors. © 2015 IEEE.

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