Negative photoconductivity under visible light illumination in LaAlO3/SrTiO3 heterostructures

被引：14

作者：

Liu, G. Z. ^{[1
]}

Zhao, R. ^{[1
]}

Qiu, J. ^{[1
]}

Jiang, Y. C. ^{[1
]}

Gao, J. ^{[1
]}

机构：

[1] Suzhou Univ Sci & Technol, Sch Math & Phys, Jiangsu Key Lab Micro & Nano Heat Fluid Flow Tech, Jiangsu Engn Lab Biosensor & Chip Technol, Suzhou 215009, Jiangsu, Peoples R China

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2019年 / 52卷 / 09期

基金：

中国国家自然科学基金;

关键词：

LaAlO3/SrTiO3; interface; electron gas; negative photoconductivity; PERSISTENT PHOTOCONDUCTIVITY; INTERFACES;

D O I：

10.1088/1361-6463/aaf8f6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electron gas in LaAlO3/SrTiO3 heterostructures typically exhibits positive photoconductivity (PPC). Here, we report negative photoconductivity (NPC) induced by visible light in LaAlO3/SrTiO3 heterostructures grown in low oxygen pressure (similar to 10(-6) Torr). In contrast to the persistent PPC effect in LaAlO3/SrTiO3 heterostructures, the NPC effect is transient and wavelength independent. The origin of the NPC effect can be mainly attributed to enhanced electron scattering from oxygen-vacancy-related electron traps, confirmed by wavelength-dependent photoconductance and light-assisted Hall measurements. Our results provide a deeper insight into the complex interaction between light and oxygen vacancy in oxide electron gas.

引用

页数：6

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