Abstract
Recently, anomalous photovoltaic effects in BiFeO3 (BFO) thin films have attracted much attention. To investigate anomalous photovoltaic effects in BFO thin films, the photovoltaic properties of single-domain structured BFO should be determined. In this study, Pt/single-domain-structured BFO/Pt coplanar capacitors have been fabricated on SrTiO3 substrates, and the illuminated laser power density, BFO film thickness, measurement direction, polarization direction of light, and sample rotation angle dependences of short-circuit current and open-circuit voltage have been investigated. It is found that such anomalous photovoltaic effects are due to second-order nonlinear optical effects including carrier excitation. Moreover, the values of independent elements in the bulk photovoltaic tensor (β), namely, β33, β31, β15, and β22 have been evaluated.
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