Influence of Ce-W co-doping on phase transition temperature of VO2 thin films deposited by ultrasonic nebulized spray pyrolysis of aqueous combustion mixture

Inyalot Jude Tadeo, Bharathi Rajeswaran, Arun M. Umarji

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11 Scopus citations

Abstract

Vanadium dioxide is widely explored as a viable material for switching applications and a robust progress has been achieved on laboratory-scale. To realise its commercialisation, industrially-viable synthetic techniques are highly required. Ultrasonic nebulised spray pyrolysis of aqueous combustion mixture (UNSPACM) is a simple, low-cost and scalable technique which offers high quality films for various energy applications. Herein, we report synthesis, characterization and influence of Ce-W co-doping on phase transition temperature of VO2(M1) thin films deposited on quartz substrates at 350 °C by this technique. The phase was verified by x-ray diffraction and Raman spectroscopic studies. FTIR studies at 2.5 µm to 14 µm IR frequencies showed 63% reversible reflectance change of the films from low reflectivity below 60 °C to high reflectivity above 60 °C. Electrical resistance measurements on the thin films showed a first order transition with resistance change of three orders of magnitude. Ce-doping (2 atomic% of Ce) resulted in increase in reflectance (up to 72%) and transition temperature (up to 75 °C) while retaining strength of the transition. Ce-W co-doping lowered transition temperature (up to 67 °C) and reflectance (up to 45%) while retaining the transition strength. Ce-W co-doping also reduced surface roughness of the films up to rms roughness value of 36 0.7 nm. We believe this technique provides an easy and simple means to synthesize VO2 thin films on large-scale for multiple applications such as smart windows among others.

Original languageEnglish
Article number185104
JournalJournal Physics D: Applied Physics
Volume53
Issue number18
DOIs
StatePublished - 29 Apr 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 IOP Publishing Ltd.

Keywords

  • Raman spectroscopy
  • VO
  • doping
  • nebulized spray pyrolysis
  • phase transition

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