Insulator-metal transition in substrate-independent VO2thin film for phase-change devices

Taha, M, Walia, S, Ahmed, T, Headland, D, Withayachumnankul, W, Sriram, S and Bhaskaran, M 2017, 'Insulator-metal transition in substrate-independent VO2thin film for phase-change devices', Scientific Reports, vol. 7, no. 1, pp. 1-10.


Document type: Journal Article
Collection: Journal Articles

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Title Insulator-metal transition in substrate-independent VO2thin film for phase-change devices
Author(s) Taha, M
Walia, S
Ahmed, T
Headland, D
Withayachumnankul, W
Sriram, S
Bhaskaran, M
Year 2017
Journal name Scientific Reports
Volume number 7
Issue number 1
Start page 1
End page 10
Total pages 10
Publisher Nature
Abstract Vanadium has 11 oxide phases, with the binary VO 2 presenting stimuli-dependent phase transitions that manifest as switchable electronic and optical features. An elevated temperature induces an insulator-to-metal transition (IMT) as the crystal reorients from a monoclinic state (insulator) to a tetragonal arrangement (metallic). This transition is accompanied by a simultaneous change in optical properties making VO 2 a versatile optoelectronic material. However, its deployment in scalable devices suffers because of the requirement of specialised substrates to retain the functionality of the material. Sensitivity to oxygen concentration and larger-scale VO 2 synthesis have also been standing issues in VO 2 fabrication. Here, we address these major challenges in harnessing the functionality in VO 2 by demonstrating an approach that enables crystalline, switchable VO 2 on any substrate. Glass, silicon, and quartz are used as model platforms to show the effectiveness of the process. Temperature-dependent electrical and optical characterisation is used demonstrating three to four orders of magnitude in resistive switching, > 60% chromic discrimination at infrared wavelengths, and terahertz property extraction. This capability will significantly broaden the horizon of applications that have been envisioned but remained unrealised due to the lack of ability to realise VO 2 on any substrate, thereby exploiting its untapped potential.
Subject Functional Materials
Nanomaterials
Keyword(s) Thin films
Phase change
Vanadium dioxide
IMT
Functional materials and microsystems
DOI - identifier 10.1038/s41598-017-17937-3
Copyright notice © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0
ISSN 2045-2322
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