Synthesis and characterization of VO2-based thermochromic thin films for energy-efficient windows

Batista, Carlos; Ribeiro, R. M.; Teixeira, V.

doi:10.1186/1556-276x-6-301

Cited by 140 publications

(86 citation statements)

References 26 publications

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“…At the temperatures below T c , the material is transparent in both the infra-red (IR) and visible part of the spectrum, therefore it allows solar radiation to pass through the window by maximising the heating effect of sunlight and minimising black body radiation within the building [152]. On the other hand, at temperatures above T c these glazing's are transparent in the visible but become reflective in the IR part of the spectrum [153] (Figure 12) [62].…”

Section: Thermochromic Vomentioning

confidence: 99%

“…Tungsten has been found to be the most efficient dopant, lowering T c by 7 • C per at % [160], 19 • C per at %, 20 • C per 2 at % [161], and by 23 • C per at % W [162]. Molybdenum doping has also been explored and found to decrease T c by 3 • C [152] and by 15 • C [163] per at % doping. Doping with 3 mol % Mo lowered T c to 42 • C [164].…”

Section: Reducing the Transition Temperaturementioning

confidence: 99%

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Thin Films for Advanced Glazing Applications

et al. 2016

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Functional thin films provide many opportunities for advanced glazing systems. This can be achieved by adding additional functionalities such as self-cleaning or power generation, or alternately by providing energy demand reduction through the management or modulation of solar heat gain or blackbody radiation using spectrally selective films or chromogenic materials. Self-cleaning materials have been generating increasing interest for the past two decades. They may be based on hydrophobic or hydrophilic systems and are often inspired by nature, for example hydrophobic systems based on mimicking the lotus leaf. These materials help to maintain the aesthetic properties of the building, help to maintain a comfortable working environment and in the case of photocatalytic materials, may provide external pollutant remediation. Power generation through window coatings is a relatively new idea and is based around the use of semi-transparent solar cells as windows. In this fashion, energy can be generated whilst also absorbing some solar heat. There is also the possibility, in the case of dye sensitized solar cells, to tune the coloration of the window that provides unheralded external aesthetic possibilities. Materials and coatings for energy demand reduction is highly desirable in an increasingly energy intensive world. We discuss new developments with low emissivity coatings as the need to replace scarce indium becomes more apparent. We go on to discuss thermochromic systems based on vanadium dioxide films. Such systems are dynamic in nature and present a more sophisticated and potentially more beneficial approach to reducing energy demand than static systems such as low emissivity and solar control coatings. The ability to be able to tune some of the material parameters in order to optimize the film performance for a given climate provides exciting opportunities for future technologies. In this article, we review recent progress and challenges in these areas and provide a perspective for future trends and developments.

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Section: Thermochromic Vomentioning

confidence: 99%

Section: Reducing the Transition Temperaturementioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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“…This sensitivity of VO 2 films and nanoparticles (NPs) to external stimuli and the ability to change the critical temperature through chemical doping [1] has made the material an attractive candidate for the development of "smart" thermal management coatings for windows [8][9][10] and protective coatings for sensors [11,12]. Of the several methods commonly used to grow VO 2 , pulsed laser deposition (PLD) has become a common technique for growing well-characterized epitaxial and polycrystalline VO 2 thin films and is still an area of active research [1,13].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic enhancement of the vanadium dioxide phase transition induced by low-power laser irradiation

et al. 2012

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Nanocomposites consisting of gold nanoparticle (NP) arrays and vanadium dioxide (VO 2 ) thin films are noteworthy for the tunability of both their thermal and optical properties. The localized surface plasmon resonance (LSPR) of the Au can be tuned when its dielectric environment is modulated by the semiconducting-to-metal phase transition (SMT) of the VO 2 ; the LSPR itself can be altered by changing the shape of the NPs and the pitch of the NP array. In principle, then it should be possible to choose a combination of VO 2 film and Au LSPR properties that maximizes the overall optical response of the nanocomposite. To demonstrate this effect, transient transmission measurements were conducted on lithographically fabricated arrays of Au NPs of diameter 140 nm, array spacing 350 nm, and covered with a 60 nm thick films of VO 2 via pulsed laser deposition. Both Au::VO 2 nanocomposites and bare VO 2 film were irradiated with a shuttered 785 nm pump laser, and their optical response was probed at 1550 nm by a fixed-frequency diode laser. The Au::VO 2 nanocomposite exhibited an increased effective absorption coefficient 1.5 times that of the plain film and required 37 % less laser power to induce the SMT. The time-dependent temperature rise in the film as a function of laser intensity was calculated from these measurements and compared with both analytic and finite-element models. Our results suggest that Au::VO 2 nanocomposites

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“…Kamalisarvestani et al [16] studied the spectral selective properties of thermochromic windows and the effect of doping of VO 2 coatings with different dopants.VO 2 could be the most promising thermochromic material, but its drawback is the preparation cost and the stability. Batista et al [17] concluded that tungsten was the most effective dopant on the reduction of the semiconductor-metal transition temperature of VO 2 . More energy could be saved by using VO 2 double window.…”

Section: Introductionmentioning

confidence: 99%

A Spectrally Selective Window for Hot Climates

Sid-Ahmed¹,

Bilal²,

Babiker³

2017

JECTC

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Rigorous coupled-wave analysis has been used to design a glazing for hot climates. The designed glazing is relatively simple and it transmits most of the visible light and reflects most of the infrared radiation. It does not need any external source of energy to control its optical properties. It consists of ITO and four periodic pairs of Si/SiO 2 , deposited on a glass sheet. The optimum thicknesses of ITO, Si and SiO 2 are 0.1 μm, 0.15 and 0.4 μm, respectively. The glazing acts as an optically selective filter. It transmits about 80% of the visible light and reflects almost all the infrared radiation. The performance of the glazing is almost independent of the angle of incidence of solar radiation. This makes it suitable for all hours of the day. The fabrication of the glazing and the testing have been performed at the laboratories of the Faculty of Science, University of Witwatersrand, South Africa. Magnetron sputtering technique has been used for the fabrication. ITO, Si and SiO 2 have been used as sputtering targets. The experimental results are almost identical to the simulation results.

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Synthesis and characterization of VO2-based thermochromic thin films for energy-efficient windows

Cited by 140 publications

References 26 publications

Thin Films for Advanced Glazing Applications

Thin Films for Advanced Glazing Applications

Plasmonic enhancement of the vanadium dioxide phase transition induced by low-power laser irradiation

A Spectrally Selective Window for Hot Climates

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