Directional ionic transport across the oxide interface enables low-temperature epitaxy of rutile TiO2

Yunkyu Park, Hyeji Sim, Minguk Jo, Gi-Yeop Kim, Daseob Yoon, Hyeon Han, Younghak Kim, Kyung Song, Donghwa Lee, Si-Young Choi and Junwoo Son ()
Additional contact information
Yunkyu Park: Pohang University of Science and Technology (POSTECH)
Hyeji Sim: Pohang University of Science and Technology (POSTECH)
Minguk Jo: Pohang University of Science and Technology (POSTECH)
Gi-Yeop Kim: Pohang University of Science and Technology (POSTECH)
Daseob Yoon: Pohang University of Science and Technology (POSTECH)
Hyeon Han: Pohang University of Science and Technology (POSTECH)
Younghak Kim: Pohang Accelerator Laboratory
Kyung Song: Korea Institute of Materials Science (KIMS)
Donghwa Lee: Pohang University of Science and Technology (POSTECH)
Si-Young Choi: Pohang University of Science and Technology (POSTECH)
Junwoo Son: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Heterogeneous interfaces exhibit the unique phenomena by the redistribution of charged species to equilibrate the chemical potentials. Despite recent studies on the electronic charge accumulation across chemically inert interfaces, the systematic research to investigate massive reconfiguration of charged ions has been limited in heterostructures with chemically reacting interfaces so far. Here, we demonstrate that a chemical potential mismatch controls oxygen ionic transport across TiO2/VO2 interfaces, and that this directional transport unprecedentedly stabilizes high-quality rutile TiO2 epitaxial films at the lowest temperature (≤ 150 °C) ever reported, at which rutile phase is difficult to be crystallized. Comprehensive characterizations reveal that this unconventional low-temperature epitaxy of rutile TiO2 phase is achieved by lowering the activation barrier by increasing the “effective” oxygen pressure through a facile ionic pathway from VO2-δ sacrificial templates. This discovery shows a robust control of defect-induced properties at oxide interfaces by the mismatch of thermodynamic driving force, and also suggests a strategy to overcome a kinetic barrier to phase stabilization at exceptionally low temperature.

Date: 2020
References: Add references at CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.nature.com/articles/s41467-020-15142-x Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15142-x

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-020-15142-x

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().