[10a-N403-1~12] 9.1 Dielectrics, ferroelectrics

[10a-N403-6] Ferroelectric photovoltaic tensor in visible-light-active Fe-doped BaTiO₃ single crystals

〇Yuji Noguchi¹ (1.Kumamoto Univ.)

Keywords:ferroelectric, photovoltaic, lattice defect

This paper reports the hv dependence of the bulk photovoltaic tensor elements beta_33 and beta_31 of Fe-doped BaTiO₃ single crystals. The reduced sample in the Fe²⁺- and Fe³⁺-coexisting state exhibits the elements over one order of magnitude higher than those of the oxidized one in the Fe³⁺ state. The reduced sample has a relation of |beta_31| > |beta_33| at hv above 2.8 eV, which originates from the dominant charge transfer from oxygen atoms to Fe³⁺ whose transfer vector is normal to P_s.