Reversible Photomodulation of Two-Dimensional Electron Gas in LaAlO<sub>3</sub>/SrTiO<sub>3</sub> Heterostructures
- Authors
- Yang, Gyeongmo; Kim, Youngmin; Jeon, Jaeyoung; Lee, Minkyung; Kim, Doyeop; Kim, Sungkyu; Eom, Kitae; Lee, Hyungwoo
- Issue Date
- Jul-2023
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Photomodulation; persistent photoconductivity; LaAlO3; SrTiO3 heterostructures; two-dimensionalelectron gases; oxygen vacancies; low-frequencynoise
- Citation
- NANO LETTERS, v.23, no.14, pp 6369 - 6377
- Pages
- 9
- Journal Title
- NANO LETTERS
- Volume
- 23
- Number
- 14
- Start Page
- 6369
- End Page
- 6377
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91783
- DOI
- 10.1021/acs.nanolett.3c01076
- ISSN
- 1530-6984
1530-6992
- Abstract
- Long-lived photoinduced conductance changes in LaAlO3/SrTiO3 (LAO/STO) heterostructures enable theiruse inoptoelectronic memory applications. However, it remains challengingto quench the persistent photoconductivity (PPC) instantly and reproducibly,which limits the reversible optoelectronic switching. Herein, we demonstratea reversible photomodulation of two-dimensional electron gas (2DEG)in LAO/STO heterostructures with high reproducibility. By irradiatingUV pulses, the 2DEG at the LAO/STO interface is gradually transformedto the PPC state. Notably, the PPC can be completely removed by watertreatment when two key requirements are met: (1) the moderate oxygendeficiency in STO and (2) the minimal band edge fluctuation at theinterface. Through our X-ray photoelectron spectroscopy and electricalnoise analysis, we reveal that the reproducible change in the conductivityof 2DEG is directly attributed to the surface-driven electron relaxationin the STO. Our results provide a stepping-stone toward developingoptically tunable memristive devices based on oxide 2DEG systems.
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