Thermochromic VO2 thin films on ITO-coated glass substrates for broadband high absorption at infra-red frequencies

Bharathi Rajeswaran; Jitendra K. Pradhan; S. Anantha Ramakrishna; Arun M. Umarji

doi:10.1063/1.5008730

Thermochromic VO₂ thin films on ITO-coated glass substrates for broadband high absorption at infra-red frequencies

Bharathi Rajeswaran, Jitendra K. Pradhan, S. Anantha Ramakrishna, Arun M. Umarji

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

Thin films of vanadium dioxide (VO₂) are deposited on indium tin oxide (ITO), stainless steel (SS), and glass substrates using chemical vapour deposition. X-ray diffraction and Raman spectroscopy measurements confirmed the single phase nature of the VO₂, which showed a phase transition from a low conducting state at low temperature(<68 °C) to a high conducting state at high temperature (>68 °C). This was confirmed by electrical conductance and infra-red reflectance measurements. X-ray photoelectron spectroscopy was used to measure the charge states of vanadium species. The optical constants of VO₂ were determined using visible and near-infra red(NIR) reflectivity and show that the VO₂ film on ITO has a lowered plasma frequency compared with VO₂ on glass substrates. The thin films of VO₂ enable a broadband of ultra-high absorption at mid-wave infra-red frequencies due to a Fabry-Pérot (F-P) like resonance due to the dielectric properties of ITO, SS, or glass. The tunability of this absorption band via VO₂ thickness and the switchability by temperature makes the system attractive for absorptive coatings with controllable emissivity.

Original language	English
Article number	163107
Journal	Journal of Applied Physics
Volume	122
Issue number	16
DOIs	https://doi.org/10.1063/1.5008730
State	Published - 28 Oct 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017 Author(s).

Funding

The funding from the DST, India under the project no. DST/SJF/PSA-01/2011–2012 is gratefully acknowledged. J.K.P. thanks University Grants Commission, India, for a fellowship. B.R. would like to acknowledge the facilities provided by the Centre for Nanoscience and Engineering, Indian Institute of Science to carry out XPS, Raman, and electrical characterization measurements. We would like to thank Mr. Inyalot Jude Tadeo for helping us to carry out the high temperature Raman spectroscopy measurements.

Funders	Funder number
Department of Science and Technology, Ministry of Science and Technology, India
University Grants Commission

Access to Document

10.1063/1.5008730

Cite this

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title = "Thermochromic VO2 thin films on ITO-coated glass substrates for broadband high absorption at infra-red frequencies",

abstract = "Thin films of vanadium dioxide (VO2) are deposited on indium tin oxide (ITO), stainless steel (SS), and glass substrates using chemical vapour deposition. X-ray diffraction and Raman spectroscopy measurements confirmed the single phase nature of the VO2, which showed a phase transition from a low conducting state at low temperature(<68 °C) to a high conducting state at high temperature (>68 °C). This was confirmed by electrical conductance and infra-red reflectance measurements. X-ray photoelectron spectroscopy was used to measure the charge states of vanadium species. The optical constants of VO2 were determined using visible and near-infra red(NIR) reflectivity and show that the VO2 film on ITO has a lowered plasma frequency compared with VO2 on glass substrates. The thin films of VO2 enable a broadband of ultra-high absorption at mid-wave infra-red frequencies due to a Fabry-P{\'e}rot (F-P) like resonance due to the dielectric properties of ITO, SS, or glass. The tunability of this absorption band via VO2 thickness and the switchability by temperature makes the system attractive for absorptive coatings with controllable emissivity.",

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AU - Umarji, Arun M.

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