A single crystal of Fe (0.3%)-doped BaTiO3 was grown by a top-seeded solution growth method, and the photovoltaic (PV) properties (at 3.1 eV) in a multi-domain state with a 90° domain structure are investigated. We show that the overall behavior can be well understood by an analytical expression of the domain wall (DW)-PV effect superimposed on the bulk-PV effect. The fitting of photocurrents as a function of light polarization reveals that the offset component of the DW-PV effect is much larger than that of the bulk-PV effect, even though the volume fraction of the DW region is extremely small. A local electric field in the DW region is estimated to be several hundred kV cm−1, which is three orders of magnitude higher than the effective field inside the domains.
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Research Article| February 22 2021
Domain-wall photovoltaic effect in Fe-doped BaTiO3 single crystals
Special Collection: Domains and Domain Walls in Ferroic Materials
Ryotaro Inoue ;
Yuji Noguchi, Ryotaro Inoue, Hiroki Matsuo; Domain-wall photovoltaic effect in Fe-doped BaTiO3 single crystals. J. Appl. Phys. 28 February 2021; 129 (8): 084101. https://doi.org/10.1063/5.0035597
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