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Thermooptical evidence of carrier-stabilized ferroelectricity in ultrathin electrodeless films |
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| Author: | Pacherova, O.1; Chvostova, D.1; Kocourek, T.1; |
| Organizations: |
1Institute of Physics of the Czech Academy of Sciences 2Institute of Problems for Material Sciences, NAS of Ukraine 3Institute of Physics, NAS of Ukraine
4Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu
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| Format: | article |
| Version: | published version |
| Access: | open |
| Online Access: | PDF Full Text (PDF, 1.7 MB) |
| Persistent link: | http://urn.fi/urn:nbn:fi-fe2018082133854 |
| Language: | English |
| Published: |
Springer Nature,
2018
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| Publish Date: | 2018-08-21 |
| Description: |
AbstractFerroelectric films may lose polarization as their thicknesses decrease to a few nanometers because of the depolarizing field that opposes the polarization therein. The depolarizing field is minimized when electrons or ions in the electrodes or the surface/interface layers screen the polarization charge or when peculiar domain configuration is formed. Here, we demonstrate ferroelectric phase transitions using thermooptical studies in ∼5-nm-thick epitaxial Pb0.5Sr0.5TiO3 films grown on different insulating substrates. By comparing theoretical modeling and experimental observations, we show that ferroelectricity is stabilized through redistribution of charge carriers (electrons or holes) inside ultrathin films. The related high-density of screening carriers is confined within a few-nanometers-thick layer in the vicinity of the insulator, thus resembling a two-dimensional carrier gas. see all
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| Series: |
Scientific reports |
| ISSN: | 2045-2322 |
| ISSN-E: | 2045-2322 |
| ISSN-L: | 2045-2322 |
| Volume: | 8 |
| Issue: | 1 |
| Article number: | 8497 |
| DOI: | 10.1038/s41598-018-26933-0 |
| OADOI: | https://oadoi.org/10.1038/s41598-018-26933-0 |
| Type of Publication: |
A1 Journal article – refereed |
| Field of Science: |
216 Materials engineering |
| Subjects: | |
| Funding: |
The authors acknowledge support from the Czech Science Foundation (Grants No. 15–15123 S and No. 15–13778S). |
| Copyright information: |
© The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
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https://creativecommons.org/licenses/by/4.0/ |