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The Effect of Alkali Metal (Na, K) Doping on Thermochromic Properties of VO2 Films

Published online by Cambridge University Press:  16 January 2018

Işıl Top ,
Johannes Schläfer ,
Russell Binions ,
Ioannis Papakonstantinou ,
Sriluxmi Srimurugananthan ,
Michael Powell ,
Ivan Parkin ,
Claire J Carmalt  and
Isaac Abrahams
Işıl Top*
Affiliation:
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, E1 4NS, UK.
Johannes Schläfer
Affiliation:
Department of Electronic and Electrical Engineering, University College London, Torrington Place,WC1E 7JE,UK.
Russell Binions
Affiliation:
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, E1 4NS, UK.
Ioannis Papakonstantinou
Affiliation:
Department of Electronic and Electrical Engineering, University College London, Torrington Place,WC1E 7JE,UK.
Sriluxmi Srimurugananthan
Affiliation:
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, E1 4NS, UK.
Michael Powell
Affiliation:
Department of Chemistry, University College London, 20 Gordon Street, London. WC1H 0AJ, UK.
Ivan Parkin
Affiliation:
Department of Chemistry, University College London, 20 Gordon Street, London. WC1H 0AJ, UK.
Claire J Carmalt
Affiliation:
Department of Chemistry, University College London, 20 Gordon Street, London. WC1H 0AJ, UK.
Isaac Abrahams*
Affiliation:
School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, E1 4NS,UK.
*
*i.top@qmul.ac.uk, i.abrahams@qmul.ac.uk
*i.top@qmul.ac.uk, i.abrahams@qmul.ac.uk
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Abstract:

This work reports the synthesis of undoped and alkali metal doped thermochromic vanadium dioxide thin films by sol-gel spin coating and subsequent low-temperature annealing at 450 °C in N2-H2 atmosphere. The effect of sodium and potassium on the phase transition temperature as well as on the solar modulations were investigated. A dopant concentration of 0.3 at% resulted in a reduction of the critical transition temperature (Tc) from 62 °C to 57 °C and 47 °C for the sodium and potassium doped films, respectively. Moreover, both dopants improved the solar modulations (ΔTsol) of the undoped VO2 films from 3.81 to 9.44 and 5.43 %, respectively.

Keywords

sol-gelthin filmdopant
Type
Articles
Information
MRS Advances , Volume 3 , Issue 32: Energy and Sustainability , 2018 , pp. 1863 - 1869
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Copyright
Copyright © Materials Research Society 2018 

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