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

被引：0
|
作者：
Zhaoting Zhang
Hong Yan
Shuanhu Wang
Min Wang
Lixia Ren
Changle Chen
Kexin Jin
机构：
[1] Northwestern Polytechnical University,Shaanxi Key Laboratory of Condensed Matter Structures and Properties, School of Natural and Applied Sciences
来源：
Journal of Materials Science | 2019年 / 54卷
关键词：
Al2O3 Film; Increasing Growth Temperature; Heterostructures; Oxygen Vacancies; Blue Light Emission;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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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页码：4780 / 4787
页数：7
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