Time dependence of different contributions for the photovoltaic effect in ferroelectric PZT thin films with asymmetric electrodes

In this work the photovoltaic response of ferroelectric Pb(Zr 0.20 Ti 0.80 )O 3 (PZT) thin films, with asymmetric Metal/Ferroelectric/Metal structure (Au/PZT/ITO), was investigated and its effect correlated to the ferroelectric and interface properties. We found two effects governing the photovoltai...

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Bibliographic Details
Published in:Ferroelectrics 2019-06, Vol.545 (1), p.22-32
Main Authors: Gonçalves, André Marino, Eiras, José Antonio
Format: Article
Language:English
Subjects:
Deoxidizing
Depolarization
domain structure
Electric fields
Electrode polarization
Electrodes
Ferroelectric materials
ferroelectric thin films
Ferroelectricity
functional interfaces
Gold
Interfacial properties
Lead zirconate titanates
Metals
Photoelectric effect
Photoelectric emission
Photovoltaic devices
Photovoltaic effect
Photovoltaics
Polarization
Thin films
Time dependence
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Summary:In this work the photovoltaic response of ferroelectric Pb(Zr 0.20 Ti 0.80 )O 3 (PZT) thin films, with asymmetric Metal/Ferroelectric/Metal structure (Au/PZT/ITO), was investigated and its effect correlated to the ferroelectric and interface properties. We found two effects governing the photovoltaic response in these thin films, a depolarization electric-field (E dep ), dependent on the direction and magnitude of the polarization, and an internal built-in electric field (E bi ) which could be generated by the different electrodes and processing conditions. The time dependence of the photocurrent showed a strong reduction of the photocurrent after poling, probably related to a reaccommodation of charges and back-switching of the polarization, due to the rearrangement of the domain structure in the material.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2019.1621707