Abstract Light illumination is widely used to tune the electronic properties of semiconductors. We have studied the effect of temperature and wavelength of light on the photoconductivity and persistent photocurrent (PPC) on an insulating (3 unit cells (u.c.) of LaVO3 (LVO) on SrTiO3 (STO)) and a conducting (5 u.c. of LVO on STO) oxide interface. Photo induced insulator to metal transition has been observed for the insulating interface. For 405 nm wavelength light illumination, the conducting interface shows PPC at all temperatures, however for 532 nm wavelength light, it shows PPC state only above 220K. For insulating sample, PPC has been observed only for 405 nm light illumination above ~150K. A model band structure has been presented to understand the experimental observations.

中文翻译：

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LaVO3-SrTiO3 界面的持久光电导

摘要 光照明被广泛用于调节半导体的电子特性。我们研究了温度和光的波长对绝缘（LaVO3 (LVO) 在 SrTiO3 (STO) 上的 3 个单位单元 (uc)）和导电（5 uc LVO 上的STO)氧化物界面。对于绝缘界面，已经观察到光致绝缘体到金属的转变。对于 405 nm 波长的光照射，导电界面在所有温度下都显示 PPC，而对于 532 nm 波长的光，它仅在 220K 以上显示 PPC 状态。对于绝缘样品，仅在~150K 以上的 405 nm 光照下观察到 PPC。已经提出了模型带结构以理解实验观察。