Cargando…

Transparent conducting oxides: A δ-doped superlattice approach

Metallic states appearing at interfaces between dissimilar insulating oxides exhibit intriguing phenomena such as superconductivity and magnetism. Despite tremendous progress in understanding their origins, very little is known about how to control the conduction pathways and the distribution of cha...

Descripción completa

Detalles Bibliográficos
Autores principales: Cooper, Valentino R., Seo, Sung S. Ambrose, Lee, Suyoun, Kim, Jun Sung, Choi, Woo Seok, Okamoto, Satoshi, Lee, Ho Nyung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4127498/
https://www.ncbi.nlm.nih.gov/pubmed/25109668
http://dx.doi.org/10.1038/srep06021
_version_ 1782330032393289728
author Cooper, Valentino R.
Seo, Sung S. Ambrose
Lee, Suyoun
Kim, Jun Sung
Choi, Woo Seok
Okamoto, Satoshi
Lee, Ho Nyung
author_facet Cooper, Valentino R.
Seo, Sung S. Ambrose
Lee, Suyoun
Kim, Jun Sung
Choi, Woo Seok
Okamoto, Satoshi
Lee, Ho Nyung
author_sort Cooper, Valentino R.
collection PubMed
description Metallic states appearing at interfaces between dissimilar insulating oxides exhibit intriguing phenomena such as superconductivity and magnetism. Despite tremendous progress in understanding their origins, very little is known about how to control the conduction pathways and the distribution of charge carriers. Using optical spectroscopic measurements and density-functional theory (DFT) simulations, we examine the effect of SrTiO(3) (STO) spacer layer thickness on the optical transparency and carrier distribution in La δ-doped STO superlattices. We experimentally observe that these metallic superlattices remain highly transparent to visible light; a direct consequence of the appropriately large gap between the O 2p and Ti 3d states. In superlattices with relatively thin STO layers, we predict that three-dimensional conduction would occur due to appreciable overlap of quantum mechanical wavefunctions between neighboring δ-doped layers. These results highlight the potential for using oxide heterostructures in optoelectronic devices by providing a unique route for creating novel transparent conducting oxides.
format Online
Article
Text
id pubmed-4127498
institution National Center for Biotechnology Information
language English
publishDate 2014
publisher Nature Publishing Group
record_format MEDLINE/PubMed
spelling pubmed-41274982014-08-14 Transparent conducting oxides: A δ-doped superlattice approach Cooper, Valentino R. Seo, Sung S. Ambrose Lee, Suyoun Kim, Jun Sung Choi, Woo Seok Okamoto, Satoshi Lee, Ho Nyung Sci Rep Article Metallic states appearing at interfaces between dissimilar insulating oxides exhibit intriguing phenomena such as superconductivity and magnetism. Despite tremendous progress in understanding their origins, very little is known about how to control the conduction pathways and the distribution of charge carriers. Using optical spectroscopic measurements and density-functional theory (DFT) simulations, we examine the effect of SrTiO(3) (STO) spacer layer thickness on the optical transparency and carrier distribution in La δ-doped STO superlattices. We experimentally observe that these metallic superlattices remain highly transparent to visible light; a direct consequence of the appropriately large gap between the O 2p and Ti 3d states. In superlattices with relatively thin STO layers, we predict that three-dimensional conduction would occur due to appreciable overlap of quantum mechanical wavefunctions between neighboring δ-doped layers. These results highlight the potential for using oxide heterostructures in optoelectronic devices by providing a unique route for creating novel transparent conducting oxides. Nature Publishing Group 2014-08-11 /pmc/articles/PMC4127498/ /pubmed/25109668 http://dx.doi.org/10.1038/srep06021 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 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 in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/
spellingShingle Article
Cooper, Valentino R.
Seo, Sung S. Ambrose
Lee, Suyoun
Kim, Jun Sung
Choi, Woo Seok
Okamoto, Satoshi
Lee, Ho Nyung
Transparent conducting oxides: A δ-doped superlattice approach
title Transparent conducting oxides: A δ-doped superlattice approach
title_full Transparent conducting oxides: A δ-doped superlattice approach
title_fullStr Transparent conducting oxides: A δ-doped superlattice approach
title_full_unstemmed Transparent conducting oxides: A δ-doped superlattice approach
title_short Transparent conducting oxides: A δ-doped superlattice approach
title_sort transparent conducting oxides: a δ-doped superlattice approach
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4127498/
https://www.ncbi.nlm.nih.gov/pubmed/25109668
http://dx.doi.org/10.1038/srep06021
work_keys_str_mv AT coopervalentinor transparentconductingoxidesaddopedsuperlatticeapproach
AT seosungsambrose transparentconductingoxidesaddopedsuperlatticeapproach
AT leesuyoun transparentconductingoxidesaddopedsuperlatticeapproach
AT kimjunsung transparentconductingoxidesaddopedsuperlatticeapproach
AT choiwooseok transparentconductingoxidesaddopedsuperlatticeapproach
AT okamotosatoshi transparentconductingoxidesaddopedsuperlatticeapproach
AT leehonyung transparentconductingoxidesaddopedsuperlatticeapproach