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Direct observation of spontaneous polarization induced electron charge transfer in stressed ZnO nanorods

: Seifikar, Masoud; Christian, Björn; Volk, János; Radó, János; Lukács, István E.; Dauksevicius, Rolanas; Gaidys, Rimvydas; Lebedev, Vadim; Viana, Antoine; O'Reilly, Eoin P.


Nano energy 43 (2018), S.376-382
ISSN: 2211-2855
Fraunhofer IAF ()

We report here a theoretical and experimental study of the charge generated when a ZnO nanorod is subjected to external force and contacting on a timescale of order seconds. We show, for the samples considered, that the measured charge flow is over four orders of magnitude larger than expected based on the strain-induced piezoelectric response, and is comparable in magnitude to the spontaneous charge on the surface of an ideal nanorod. We present a defect-mediated electrostatic model to explain how the measured charge transfer can arise from the nanorod spontaneous polarization induced electron charge.