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Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface

The six-fold symmetry possessed by the (111) surfaces of perovskite oxides allows the epitaxial growth of novel quantum materials such as topological insulators. The dielectric SrTiO(3)(111) thin film is an ideal buffer layer, providing the readily tunability of charge density in gate-controlled str...

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Autores principales: Liang, Yan, Li, Wentao, Zhang, Shuyuan, Lin, Chaojing, Li, Chao, Yao, Yuan, Li, Yongqing, Yang, Hao, Guo, Jiandong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4466594/
https://www.ncbi.nlm.nih.gov/pubmed/26073468
http://dx.doi.org/10.1038/srep10634
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author Liang, Yan
Li, Wentao
Zhang, Shuyuan
Lin, Chaojing
Li, Chao
Yao, Yuan
Li, Yongqing
Yang, Hao
Guo, Jiandong
author_facet Liang, Yan
Li, Wentao
Zhang, Shuyuan
Lin, Chaojing
Li, Chao
Yao, Yuan
Li, Yongqing
Yang, Hao
Guo, Jiandong
author_sort Liang, Yan
collection PubMed
description The six-fold symmetry possessed by the (111) surfaces of perovskite oxides allows the epitaxial growth of novel quantum materials such as topological insulators. The dielectric SrTiO(3)(111) thin film is an ideal buffer layer, providing the readily tunability of charge density in gate-controlled structures. But the high-quality film growth is challenging due to its strong surface polarity as well as the difficulty of obtaining the chemical stoichiometry. Here we show that the layer-by-layer growth of homoepitaxial SrTiO(3)(111) thin films can be achieved in molecular beam epitaxy method by keeping the growing surface reconstructed. And the cation stoichiometry is optimized precisely with the reflective high energy electron diffraction as the feedback signal that changes sensitively to the variation of metal concentration during growth. With atomically well-defined surfaces, the SrTiO(3)(111) films show high dielectric performance with the charge density modulated in the range of 2 × 10(13)/cm(2) with the back gate voltage lower than 0.2 V. Methods of further broadening the range are also discussed.
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spelling pubmed-44665942015-06-18 Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface Liang, Yan Li, Wentao Zhang, Shuyuan Lin, Chaojing Li, Chao Yao, Yuan Li, Yongqing Yang, Hao Guo, Jiandong Sci Rep Article The six-fold symmetry possessed by the (111) surfaces of perovskite oxides allows the epitaxial growth of novel quantum materials such as topological insulators. The dielectric SrTiO(3)(111) thin film is an ideal buffer layer, providing the readily tunability of charge density in gate-controlled structures. But the high-quality film growth is challenging due to its strong surface polarity as well as the difficulty of obtaining the chemical stoichiometry. Here we show that the layer-by-layer growth of homoepitaxial SrTiO(3)(111) thin films can be achieved in molecular beam epitaxy method by keeping the growing surface reconstructed. And the cation stoichiometry is optimized precisely with the reflective high energy electron diffraction as the feedback signal that changes sensitively to the variation of metal concentration during growth. With atomically well-defined surfaces, the SrTiO(3)(111) films show high dielectric performance with the charge density modulated in the range of 2 × 10(13)/cm(2) with the back gate voltage lower than 0.2 V. Methods of further broadening the range are also discussed. Nature Publishing Group 2015-06-15 /pmc/articles/PMC4466594/ /pubmed/26073468 http://dx.doi.org/10.1038/srep10634 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Liang, Yan
Li, Wentao
Zhang, Shuyuan
Lin, Chaojing
Li, Chao
Yao, Yuan
Li, Yongqing
Yang, Hao
Guo, Jiandong
Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface
title Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface
title_full Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface
title_fullStr Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface
title_full_unstemmed Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface
title_short Homoepitaxial SrTiO(3)(111) Film with High Dielectric Performance and Atomically Well-Defined Surface
title_sort homoepitaxial srtio(3)(111) film with high dielectric performance and atomically well-defined surface
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4466594/
https://www.ncbi.nlm.nih.gov/pubmed/26073468
http://dx.doi.org/10.1038/srep10634
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