University of Oulu

Vats, G., Bai, Y. and Seidel, J. (2021), Optomechanical Mapping of Ferroelectric Domains and the Piezo-Photovoltaic Effect in Ba- and Ni-Doped (K0.5Na0.5)NbO3. Adv. Photonics Res. 2100050.

Optomechanical mapping of ferroelectric domains and the piezo-photovoltaic effect in Ba- and Ni-Doped (K0.5Na0.5)NbO3

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Author: Vats, Gaurav1,2; Bai, Yang3; Seidel, Jan1
Organizations: 1School of Materials Science and Engineering University of New South Wales Sydney, NSW 2052, Australia
2Department of Physics and Astronomy Katholieke Universiteit Leuven Celestijnenlaan 200D, Leuven B-3001, Belgium
3Microelectronics Research Unit Faculty of Information Technology and Electrical Engineering University of Oulu Oulu FI-90014, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
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Language: English
Published: John Wiley & Sons, 2021
Publish Date: 2021-08-19


The piezo-photovoltaic effect has been recently proposed as an analogy of the flexo-photovoltaic effect in noncentrosymmetric ferroelectrics that are also piezoelectric in nature. It has been demonstrated to boost the photovoltaic performance of ferroelectrics under applied uniaxial mechanical loads. The impact of the piezo-photovoltaic effect on ferroelectric domains, however, has not yet been studied. In this context, a nanoscale insight into mechanical as well as optomechanical control of domains in a novel bandgap-engineered ferroelectric, namely—KNBNNO ((K0.5Na0.5)NbO3–2 mol% Ba(Ni0.5Nb0.5)O3−δ), is provided. It is found that the applied mechanical force of 1 μN (pressure: 0.25 GPa) using a scanning probe tip evinces a 67% amplification in piezoresponse in the material, and on removing mechanical load, the material retains 33% higher piezoresponse than the pristine state. Mechanically induced property changes in the material are found to be strongly influenced by light illumination. Applied mechanical stress due to an atomic force microscopy (AFM) tip is highly nonuniform and can induce additional polarization via the flexoelectric effect which further enhances the photovoltaic charge screening.

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Series: Advanced photonics research
ISSN: 2699-9293
ISSN-E: 2699-9293
ISSN-L: 2699-9293
Volume: Early View
Issue: Early View
Pages: 1 - 7
DOI: 10.1002/adpr.202100050
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The authors acknowledge support from the Australian Research Council (ARC) through Discovery Grants. Y.B. would like to acknowledge the joint funding by the University of Oulu and Academy of Finland profiling action ‘‘Ubiquitous wireless sensor systems’’ (grant number 24302332). G.V. acknowledges the financial support from the Marie Skłodowska Curie Actions grant (Agreement ID: 892669) under Horizon 2020 by the European Commission.
Copyright information: © 2021 The Authors. Advanced Photonics Research published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.