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Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature

A study on charge transport properties of thin film Fe-doped SrTiO(3) epitaxially grown on Nb-doped SrTiO(3) is reported. Electric measurements between 350 °C and 750 °C show a transition from predominant ionic to electronic conduction and lower conductivity of the thin films compared to the bulk of...

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Autores principales: Kubicek, M., Taibl, S., Navickas, E., Hutter, H., Fafilek, G., Fleig, J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5752752/
https://www.ncbi.nlm.nih.gov/pubmed/29367832
http://dx.doi.org/10.1007/s10832-017-0081-2
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author Kubicek, M.
Taibl, S.
Navickas, E.
Hutter, H.
Fafilek, G.
Fleig, J.
author_facet Kubicek, M.
Taibl, S.
Navickas, E.
Hutter, H.
Fafilek, G.
Fleig, J.
author_sort Kubicek, M.
collection PubMed
description A study on charge transport properties of thin film Fe-doped SrTiO(3) epitaxially grown on Nb-doped SrTiO(3) is reported. Electric measurements between 350 °C and 750 °C show a transition from predominant ionic to electronic conduction and lower conductivity of the thin films compared to the bulk of polycrystalline samples. Defect chemical changes at elevated temperature were investigated by applying a bias voltage. A model is described which successfully predicts additional features such as inductive loops or extra semicircles measureable by impedance spectroscopy as well as the complicated time dependence of electric DC-measurements. With this model it is also possible to calculate the negligibly small ionic conductivity next to the dominating electronic conductivity in the high temperature regime. The ionic conductivity is referenced by oxygen isotope depth profiling. Changes of resistive states in Fe-doped SrTiO(3) thin films at high temperature and moderate fields are compared to room temperature resistive switching phenomena at high electric fields. A conductive filament based switching process is observed at room temperature, and the capability for forming such filaments and their electric properties is further analysed using microelectrodes.
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spelling pubmed-57527522018-01-22 Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature Kubicek, M. Taibl, S. Navickas, E. Hutter, H. Fafilek, G. Fleig, J. J Electroceram Article A study on charge transport properties of thin film Fe-doped SrTiO(3) epitaxially grown on Nb-doped SrTiO(3) is reported. Electric measurements between 350 °C and 750 °C show a transition from predominant ionic to electronic conduction and lower conductivity of the thin films compared to the bulk of polycrystalline samples. Defect chemical changes at elevated temperature were investigated by applying a bias voltage. A model is described which successfully predicts additional features such as inductive loops or extra semicircles measureable by impedance spectroscopy as well as the complicated time dependence of electric DC-measurements. With this model it is also possible to calculate the negligibly small ionic conductivity next to the dominating electronic conductivity in the high temperature regime. The ionic conductivity is referenced by oxygen isotope depth profiling. Changes of resistive states in Fe-doped SrTiO(3) thin films at high temperature and moderate fields are compared to room temperature resistive switching phenomena at high electric fields. A conductive filament based switching process is observed at room temperature, and the capability for forming such filaments and their electric properties is further analysed using microelectrodes. Springer US 2017-04-03 2017 /pmc/articles/PMC5752752/ /pubmed/29367832 http://dx.doi.org/10.1007/s10832-017-0081-2 Text en © The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Article
Kubicek, M.
Taibl, S.
Navickas, E.
Hutter, H.
Fafilek, G.
Fleig, J.
Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature
title Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature
title_full Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature
title_fullStr Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature
title_full_unstemmed Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature
title_short Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature
title_sort resistive states in strontium titanate thin films: bias effects and mechanisms at high and low temperature
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5752752/
https://www.ncbi.nlm.nih.gov/pubmed/29367832
http://dx.doi.org/10.1007/s10832-017-0081-2
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