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Title: Growth control of the oxidation state in vanadium oxide thin films

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4903348· OSTI ID:1185719
 [1];  [1];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Pusan National Univ., Busan (Korea, Republic of)

Precise control of the chemical valence or oxidation state of vanadium in vanadium oxide thin films is highly desirable for not only fundamental research, but also technological applications that utilize the subtle change in the physical properties originating from the metalinsulator transition (MIT) near room temperature. However, due to the multivalent nature of vanadium and the lack of a good understanding on growth control of the oxidation state, stabilization of phase pure vanadium oxides with a single oxidation state is extremely challenging. Here, we systematically varied the growth conditions to clearly map out the growth window for preparing phase pure epitaxial vanadium oxides by pulsed laser deposition for providing a guideline to grow high quality thin films with well-defined oxidation states of V₂⁺²O₃, V⁺⁴O₂, and V₂⁺⁵O₅. A well pronounced MIT was only observed in VO₂ films grown in a very narrow range of oxygen partial pressure P(O₂). The films grown either in lower (< 10 mTorr) or higher P(O₂) (> 25 mTorr) result in V₂O₃ and V₂O₅ phases, respectively, thereby suppressing the MIT for both cases. We have also found that the resistivity ratio before and after the MIT of VO₂ thin films can be further enhanced by one order of magnitude when the films are further oxidized by post-annealing at a well-controlled oxidizing ambient. This result indicates that stabilizing vanadium into a single valence state has to compromise with insufficient oxidation of an as grown thin film and, thereby, a subsequent oxidation is required for an 3 improved MIT behavior.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1185719
Journal Information:
Applied Physics Letters, Vol. 105, Issue 22; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (14)

Electrochemically Triggered Metal-Insulator Transition between VO 2 and V 2 O 5 journal June 2018
Epitaxial Liftoff of Wafer‐Scale VO 2 Nanomembranes for Flexible, Ultrasensitive Tactile Sensors journal April 2019
Electrical and Optical Properties of VO 2 Polymorphic Films Grown Epitaxially on Y-Stabilized ZrO 2 journal April 2018
Electronic structure and insulating gap in epitaxial VO 2 polymorphs journal December 2015
Thermally tunable VO 2 -SiO 2 nanocomposite thin-film capacitors journal March 2018
Competing phases in epitaxial vanadium dioxide at nanoscale journal August 2019
Strain engineering on the metal-insulator transition of VO 2 /TiO 2 epitaxial films dependent on the strain state of vanadium dimers journal December 2019
Tuning phase transition temperature of VO 2 thin films by annealing atmosphere journal June 2015
The influence of Al 2 O 3 content on Al 2 O 3 -ZrO 2 composite-textural structural and morphological studies journal August 2019
Sharp contrast in the electrical and optical properties of vanadium Wadsley ( V m O 2 m + 1 , m > 1 ) epitaxial films selectively stabilized on (111)-oriented Y-stabilized Zr O 2 journal June 2019
Thermally-induced optical modulation in a vanadium dioxide-on-silicon waveguide journal January 2020
Opportunities in vanadium-based strongly correlated electron systems journal February 2017
Experimental Implementation and Theoretical Investigation of a Vanadium Dioxide Optical Filter for Bit Error Rate Enhancement of Enhanced Space Shift Keying Visible Light Communication Systems journal June 2019
Competing Phases in Epitaxial Vanadium Dioxide at Nanoscale preprint January 2019

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