Highly conductive two-dimensional electron gas at the interface of Al2O3/SrTiO3

Zhaoting Zhang; Hong Yan; Shuanhu Wang; Min Wang; Lixia Ren; Changle Chen; Kexin Jin

doi:10.1007/s10853-018-3167-6

Highly conductive two-dimensional electron gas at the interface of Al₂O₃/SrTiO₃

Zhaoting Zhang, Hong Yan, Shuanhu Wang, Min Wang, Lixia Ren, Changle Chen, Kexin Jin

School of Physical Science and Technology

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

We create a two-dimensional electron gas at the Al₂O₃/SrTiO₃/LaAlO₃ heterostructures using pulsed laser deposition, which exhibits a decreasing sheet resistance with increasing growth temperatures of Al₂O₃ films. Structural characterizations of films are confirmed by cross-sectional transmission electron microscopy. Compared with these heterostructures with Al₂O₃ films deposited on pristine SrTiO₃ and TiO₂-terminated SrTiO₃ substrates, the Al₂O₃/SrTiO₃/LaAlO₃ heterostructures are more conductive. X-ray photoelectron spectroscopy indicates the formation of oxygen vacancies at the SrTiO₃ side of the interface, which results from the redox reactions by reducing SrTiO₃ films. Furthermore, the existence of oxygen vacancies on the SrTiO₃ side is verified by a blue-light emission.

Original language	English
Pages (from-to)	4780-4787
Number of pages	8
Journal	Journal of Materials Science
Volume	54
Issue number	6
DOIs	https://doi.org/10.1007/s10853-018-3167-6
State	Published - 30 Mar 2019

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title = "Highly conductive two-dimensional electron gas at the interface of Al2O3/SrTiO3 ",

abstract = "We create a two-dimensional electron gas at the Al2O3/SrTiO3/LaAlO3 heterostructures using pulsed laser deposition, which exhibits a decreasing sheet resistance with increasing growth temperatures of Al2O3 films. Structural characterizations of films are confirmed by cross-sectional transmission electron microscopy. Compared with these heterostructures with Al2O3 films deposited on pristine SrTiO3 and TiO2-terminated SrTiO3 substrates, the Al2O3/SrTiO3/LaAlO3 heterostructures are more conductive. X-ray photoelectron spectroscopy indicates the formation of oxygen vacancies at the SrTiO3 side of the interface, which results from the redox reactions by reducing SrTiO3 films. Furthermore, the existence of oxygen vacancies on the SrTiO3 side is verified by a blue-light emission.",

author = "Zhaoting Zhang and Hong Yan and Shuanhu Wang and Min Wang and Lixia Ren and Changle Chen and Kexin Jin",

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T1 - Highly conductive two-dimensional electron gas at the interface of Al2O3/SrTiO3

AU - Zhang, Zhaoting

AU - Yan, Hong

AU - Wang, Shuanhu

AU - Wang, Min

AU - Ren, Lixia

AU - Chen, Changle

AU - Jin, Kexin

PY - 2019/3/30

Y1 - 2019/3/30

N2 - We create a two-dimensional electron gas at the Al2O3/SrTiO3/LaAlO3 heterostructures using pulsed laser deposition, which exhibits a decreasing sheet resistance with increasing growth temperatures of Al2O3 films. Structural characterizations of films are confirmed by cross-sectional transmission electron microscopy. Compared with these heterostructures with Al2O3 films deposited on pristine SrTiO3 and TiO2-terminated SrTiO3 substrates, the Al2O3/SrTiO3/LaAlO3 heterostructures are more conductive. X-ray photoelectron spectroscopy indicates the formation of oxygen vacancies at the SrTiO3 side of the interface, which results from the redox reactions by reducing SrTiO3 films. Furthermore, the existence of oxygen vacancies on the SrTiO3 side is verified by a blue-light emission.

AB - We create a two-dimensional electron gas at the Al2O3/SrTiO3/LaAlO3 heterostructures using pulsed laser deposition, which exhibits a decreasing sheet resistance with increasing growth temperatures of Al2O3 films. Structural characterizations of films are confirmed by cross-sectional transmission electron microscopy. Compared with these heterostructures with Al2O3 films deposited on pristine SrTiO3 and TiO2-terminated SrTiO3 substrates, the Al2O3/SrTiO3/LaAlO3 heterostructures are more conductive. X-ray photoelectron spectroscopy indicates the formation of oxygen vacancies at the SrTiO3 side of the interface, which results from the redox reactions by reducing SrTiO3 films. Furthermore, the existence of oxygen vacancies on the SrTiO3 side is verified by a blue-light emission.

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JO - Journal of Materials Science

JF - Journal of Materials Science

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Highly conductive two-dimensional electron gas at the interface of Al₂O₃/SrTiO₃

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