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.

中文翻译：

---

Fe掺杂BaTiO3单晶中的畴壁光伏效应

通过顶晶溶液生长法生长了掺Fe（0.3％）的BaTiO ₃单晶，并研究了具有90°畴结构的多畴状态下的光伏（PV）特性（在3.1 eV时） 。我们显示，通过叠加在块状PV效应上的畴壁（DW）-PV效应的分析表达式可以很好地理解整体行为。光电流与光偏振的函数关系表明，即使DW区域的体积分数非常小，DW-PV效应的偏移分量也比体PV效应的偏移分量大得多。DW区域中的局部电场估计为几百kV cm ^-1，比域内的有效电场高三个数量级。