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

Tadeo, IJ and Rajeswaran, B and Umarji, AM (2020) Influence of Ce-W co-doping on phase transition temperature of VO2 thin films deposited by ultrasonic nebulized spray pyrolysis of aqueous combustion mixture. In: Journal of Physics D: Applied Physics, 53 (18).

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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.

Item Type:	Journal Article
Publication:	Journal of Physics D: Applied Physics
Publisher:	Institute of Physics Publishing
Additional Information:	The copyright of this article belongs to Institute of Physics Publishing
Keywords:	Binary alloys; Combustion; Doping (additives); Fourier transform infrared spectroscopy; Mixtures; Phase transitions; Raman spectroscopy; Reflection; Semiconductor doping; Spectroscopic analysis; Spray pyrolysis; Surface roughness; Temperature; Ultrasonic applications; Vanadium dioxide, Electrical resistance measurement; First order transitions; Multiple applications; Nebulized spray pyrolysis; Raman spectroscopic study; Switching applications; Three orders of magnitude; Ultrasonic nebulized spray pyrolysis of aqueous combustion mixtures, Thin films
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	10 Jul 2020 06:28
Last Modified:	10 Jul 2020 06:28
URI:	http://eprints.iisc.ac.in/id/eprint/65046

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