Journal
JOURNAL OF APPLIED PHYSICS
Volume 129, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0035597
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Funding
- JSPS [26-4693]
- JSPS KAKENHI [26249094, 17H06239]
- Grants-in-Aid for Scientific Research [17H06239, 26249094] Funding Source: KAKEN
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Experimental study showed that Fe doping significantly affects the photovoltaic properties of BaTiO3 single crystal, with the DW-PV effect having a more significant impact on overall behavior than the bulk-PV effect, despite the small volume fraction of the DW region. The estimated local electric field in the DW region reaches several hundred kVcm(-1), three orders of magnitude higher than the effective field inside the domains.
A single crystal of Fe (0.3%)-doped BaTiO3 was grown by a top-seeded solution growth method, and the photovoltaic (PV) properties (at 3.1eV) in a multi-domain state with a 90 degrees 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 kVcm(-1), which is three orders of magnitude higher than the effective field inside the domains.
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