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Surface morphology-optical properties relationship in thermochromic VO2 thin films obtained by air oxidation of vanadium nitride

Abstract : In this paper, vanadium nitride (VN) thin films have been deposited on Al substrates by reactive magnetron sputtering. Thermochromic VO 2 films have been obtained by air oxidation of VN samples performed at three temperatures (450, 525 and 550 C) at various durations (lower than 50 min). X-ray diffraction and Raman spectrometry of the VN oxidized films indicate that VO 2 and V 2 O 5 are the only phases produced during the oxidation process. Vanadium dioxide is the first oxide formed. It coexists with VN in a long period at 450 C or suddenly disappears at 525 and 550 C. Whatever the temperature, V 2 O 5 is exclusively detected after the total oxidation of VN. This oxide is detrimental to the thermochromic performance of films. The emissivity-switching properties of the oxidized films were analyzed by infrared camera in the 7.5e13 mm range. The comparison among all the samples exhibiting a thermochromic behavior shows that the maximum emissivity switch is independent of the oxidation temperature and the surface morphology of the samples. These results could open a new strategy in the investigation of VN oxidation as a method to obtain VO 2 , along with an insight into the correlation between surface morphology and optical properties.
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Contributor : Jean-François Pierson <>
Submitted on : Monday, July 5, 2021 - 2:55:47 PM
Last modification on : Thursday, September 2, 2021 - 10:35:59 AM

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A García-Wong, D Pilloud, S Bruyère, D Mangin, S Migot, et al.. Surface morphology-optical properties relationship in thermochromic VO2 thin films obtained by air oxidation of vanadium nitride. Journal of Materiomics, The Chinese Ceramic Society, 2020, 7, pp.657 - 664. ⟨10.1016/j.jmat.2020.12.005⟩. ⟨hal-03278346⟩

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