Tuning the Two-Dimensional Electron Gas at Oxide Interfaces with Ti-O Configurations: Evidence from X-ray Photoelectron Spectroscopy

Yu Zhang; Yulin Gan; Wei Niu; Kion Norrman; Xi Yan; Dennis Valbjørn Christensen; Merlin Von Soosten; Hongrui Zhang; Baogen Shen; Nini Pryds; Jirong Sun; Yunzhong Chen

doi:10.1021/acsami.7b16510

Tuning the Two-Dimensional Electron Gas at Oxide Interfaces with Ti-O Configurations: Evidence from X-ray Photoelectron Spectroscopy

Yu Zhang, Yulin Gan, Wei Niu, Kion Norrman, Xi Yan, Dennis Valbjørn Christensen, Merlin Von Soosten, Hongrui Zhang, Baogen Shen, Nini Pryds, Jirong Sun^*, Yunzhong Chen

^*Corresponding author for this work

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

18 Scopus citations

Abstract

A chemical redox reaction can lead to a two-dimensional electron gas at the interface between a TiO₂-terminated SrTiO₃ (STO) substrate and an amorphous LaAlO₃ capping layer. When replacing the STO substrate with rutile and anatase TiO₂ substrates, considerable differences in the interfacial conduction are observed. On the basis of X-ray photoelectron spectroscopy (XPS) and transport measurements, we conclude that the interfacial conduction comes from redox reactions, and that the differences among the materials systems result mainly from variations in the activation energies for the diffusion of oxygen vacancies at substrate surfaces.

Original language	English
Pages (from-to)	1434-1439
Number of pages	6
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	1
DOIs	https://doi.org/10.1021/acsami.7b16510
State	Published - 10 Jan 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

Keywords

SrTiO
TiO
oxygen vacancies
redox reaction
two-dimensional electron gas

ASJC Scopus subject areas

General Materials Science

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10.1021/acsami.7b16510

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Zhang, Y., Gan, Y., Niu, W., Norrman, K., Yan, X., Christensen, D. V., Von Soosten, M., Zhang, H., Shen, B., Pryds, N., Sun, J., & Chen, Y. (2018). Tuning the Two-Dimensional Electron Gas at Oxide Interfaces with Ti-O Configurations: Evidence from X-ray Photoelectron Spectroscopy. ACS Applied Materials and Interfaces, 10(1), 1434-1439. https://doi.org/10.1021/acsami.7b16510

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title = "Tuning the Two-Dimensional Electron Gas at Oxide Interfaces with Ti-O Configurations: Evidence from X-ray Photoelectron Spectroscopy",

abstract = "A chemical redox reaction can lead to a two-dimensional electron gas at the interface between a TiO2-terminated SrTiO3 (STO) substrate and an amorphous LaAlO3 capping layer. When replacing the STO substrate with rutile and anatase TiO2 substrates, considerable differences in the interfacial conduction are observed. On the basis of X-ray photoelectron spectroscopy (XPS) and transport measurements, we conclude that the interfacial conduction comes from redox reactions, and that the differences among the materials systems result mainly from variations in the activation energies for the diffusion of oxygen vacancies at substrate surfaces.",

keywords = "SrTiO, TiO, oxygen vacancies, redox reaction, two-dimensional electron gas",

author = "Yu Zhang and Yulin Gan and Wei Niu and Kion Norrman and Xi Yan and Christensen, \{Dennis Valbj{\o}rn\} and \{Von Soosten\}, Merlin and Hongrui Zhang and Baogen Shen and Nini Pryds and Jirong Sun and Yunzhong Chen",

note = "Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

year = "2018",

month = jan,

day = "10",

doi = "10.1021/acsami.7b16510",

language = "English",

volume = "10",

pages = "1434--1439",

journal = "ACS Applied Materials and Interfaces",

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Zhang, Y, Gan, Y, Niu, W, Norrman, K, Yan, X, Christensen, DV, Von Soosten, M, Zhang, H, Shen, B, Pryds, N, Sun, J & Chen, Y 2018, 'Tuning the Two-Dimensional Electron Gas at Oxide Interfaces with Ti-O Configurations: Evidence from X-ray Photoelectron Spectroscopy', ACS Applied Materials and Interfaces, vol. 10, no. 1, pp. 1434-1439. https://doi.org/10.1021/acsami.7b16510

TY - JOUR

T1 - Tuning the Two-Dimensional Electron Gas at Oxide Interfaces with Ti-O Configurations

T2 - Evidence from X-ray Photoelectron Spectroscopy

AU - Zhang, Yu

AU - Gan, Yulin

AU - Niu, Wei

AU - Norrman, Kion

AU - Yan, Xi

AU - Christensen, Dennis Valbjørn

AU - Von Soosten, Merlin

AU - Zhang, Hongrui

AU - Shen, Baogen

AU - Pryds, Nini

AU - Sun, Jirong

AU - Chen, Yunzhong

PY - 2018/1/10

Y1 - 2018/1/10

N2 - A chemical redox reaction can lead to a two-dimensional electron gas at the interface between a TiO2-terminated SrTiO3 (STO) substrate and an amorphous LaAlO3 capping layer. When replacing the STO substrate with rutile and anatase TiO2 substrates, considerable differences in the interfacial conduction are observed. On the basis of X-ray photoelectron spectroscopy (XPS) and transport measurements, we conclude that the interfacial conduction comes from redox reactions, and that the differences among the materials systems result mainly from variations in the activation energies for the diffusion of oxygen vacancies at substrate surfaces.

AB - A chemical redox reaction can lead to a two-dimensional electron gas at the interface between a TiO2-terminated SrTiO3 (STO) substrate and an amorphous LaAlO3 capping layer. When replacing the STO substrate with rutile and anatase TiO2 substrates, considerable differences in the interfacial conduction are observed. On the basis of X-ray photoelectron spectroscopy (XPS) and transport measurements, we conclude that the interfacial conduction comes from redox reactions, and that the differences among the materials systems result mainly from variations in the activation energies for the diffusion of oxygen vacancies at substrate surfaces.

KW - SrTiO

KW - TiO

KW - oxygen vacancies

KW - redox reaction

KW - two-dimensional electron gas

UR - https://www.scopus.com/pages/publications/85040457987

U2 - 10.1021/acsami.7b16510

DO - 10.1021/acsami.7b16510

M3 - Article

C2 - 29226677

AN - SCOPUS:85040457987

SN - 1944-8244

VL - 10

SP - 1434

EP - 1439

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 1

ER -

Tuning the Two-Dimensional Electron Gas at Oxide Interfaces with Ti-O Configurations: Evidence from X-ray Photoelectron Spectroscopy

Abstract

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Keywords

ASJC Scopus subject areas

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