异质结
费米气体
X射线光电子能谱
材料科学
光电子学
电导
放松(心理学)
氧化物
电子
凝聚态物理
物理
核磁共振
心理学
社会心理学
量子力学
冶金
作者
Gyeongmo Yang,Young‐Min Kim,Jaeyoung Jeon,Min-Kyung Lee,Doyeop Kim,Sungkyu Kim,Kitae Eom,Hyungwoo Lee
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-07-07
卷期号:23 (14): 6369-6377
被引量:15
标识
DOI:10.1021/acs.nanolett.3c01076
摘要
(LAO/STO) heterostructures enable their use in optoelectronic memory applications. However, it remains challenging to quench the persistent photoconductivity (PPC) instantly and reproducibly, which limits the reversible optoelectronic switching. Herein, we demonstrate a reversible photomodulation of two-dimensional electron gas (2DEG) in LAO/STO heterostructures with high reproducibility. By irradiating UV pulses, the 2DEG at the LAO/STO interface is gradually transformed to the PPC state. Notably, the PPC can be completely removed by water treatment when two key requirements are met: (1) the moderate oxygen deficiency in STO and (2) the minimal band edge fluctuation at the interface. Through our X-ray photoelectron spectroscopy and electrical noise analysis, we reveal that the reproducible change in the conductivity of 2DEG is directly attributed to the surface-driven electron relaxation in the STO. Our results provide a stepping-stone toward developing optically tunable memristive devices based on oxide 2DEG systems.
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