Ferroelectric materials are considered as a promising candidate for photovoltaic devices owing to spontaneous polarization which may affect the photocarrier dynamics and raise photovoltaic effect. However, the interaction mechanism between the ferroelectric polarization and the photocarrier dynamics is still unclear, which limits the practical applications of this kind of materials. Here, we used femtosecond time-resolved reflectance measurements to monitor the photocarrier dynamics of PbTi_1-xNi_xO₃ (PTNO) films with different Ni doping concentrations, therefore the samples have different ferroelectric polarizations. We found that in the PTNO films with larger polarizations, the photocurrents are higher and the photocarriers recombined slower. We deduce that the depolarization fields are stronger in films with larger polarizations, and the photogenerated electrons and holes are separated more effectively. The recombination of photocarriers is retarded and the photocurrent is improved. Our study supplies a novel way for the enhancement of photovoltaic performances of ferroelectric material.

由于自发极化可能影响光载流子动力学并提高光伏效应，铁电材料被认为是光伏器件的有希望的候选材料。然而，铁电极化与光载流子动力学之间的相互作用机制尚不清楚，这限制了此类材料的实际应用。在这里，我们使用飞秒时间分辨反射率测量来监测 PbTi _1-x Ni _x O ₃的光载流子动力学(PTNO) 薄膜具有不同的 Ni 掺杂浓度，因此样品具有不同的铁电极化。我们发现在极化较大的 PTNO 薄膜中，光电流较高，光载流子复合较慢。我们推断，偏振越大的薄膜去偏振场越强，光生电子和空穴的分离效果越好。光载流子的复合被延迟并提高了光电流。我们的研究为提高铁电材料的光伏性能提供了一种新方法。