Near-zero IR transmission in the metal-insulator transition of VO2 thin films

Balu, R.; Ashrit, P. V.

doi:10.1063/1.2834367

Cited by 80 publications

(47 citation statements)

References 14 publications

(11 reference statements)

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“…120 From a practical point of view, VO 2 may be awkward to prepare since the vanadium ions are in states with intermediate oxidation and it may be more facile to fabricate materials under nonoxidizing ͑metallic V͒ or fully oxidizing ͑in-sulating V 2 O 5 ͒ conditions. The limitations are not as stringent as they may seem, though, and it should be observed that metallic vanadium can be transformed to VO 2 by controlled oxidation [121][122][123][124] and that insulating V 2 O 5 van be transformed to VO 2 by controlled reduction in films. [125][126][127] There is a tendency that limited dimensions decreases c and widens the hysteresis in nanocrystalline films 46,48,[128][129][130][131][132][133][134][135] and nanorods.…”

Section: Discussionmentioning

confidence: 99%

Nanothermochromics: Calculations for VO2 nanoparticles in dielectric hosts show much improved luminous transmittance and solar energy transmittance modulation

Li¹,

Niklasson²,

Granqvist³

2010

Journal of Applied Physics

238

192

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VO 2 -based films are thermochromic and show infrared reflectance above a "critical" temperature in the vicinity of room temperature. Implementations on energy efficient windows have been discussed for decades but have been severely curtailed since the luminous absorptance is undesirably large and the solar energy transmittance modulation is too small. Here we show by calculations based on effective medium theory that dilute composites with VO 2 nanoparticles embedded in hosts with properties mimicking glass or polymer can yield significantly decreased luminous absorption jointly with much enhanced transmittance modulation of solar energy. These results demonstrate that VO 2 -based nanothermochromics opens new avenues toward energy efficient fenestration.

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Section: Discussionmentioning

confidence: 99%

Nanothermochromics: Calculations for VO2 nanoparticles in dielectric hosts show much improved luminous transmittance and solar energy transmittance modulation

Li¹,

Niklasson²,

Granqvist³

2010

Journal of Applied Physics

238

192

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“…A 428-nm-thick VO 2 film exhibits a IR transmittance change of 76.5% (from 83% to 6.5%) at 2500 nm, even prior to the optimized result of sputtering films (74%). 19 Another interesting phenomenon is that the changes in luminous transmittance (∆T lum ) across the MIT are thickness dependent. For thin films, the visible transmittance at 20 °C is generally lower than that at 90 °C ( Figure 22 and Table 1) and, vice versa.…”

Section: The Methodsmentioning

confidence: 99%

Solution Processing of Nanoceramic VO2 Thin Films for Application to Smart Windows

Gao¹,

Kang²,

Chen³

et al. 2011

Nanofabrication

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“…The use of polymer templates and surfactants has also been shown to change the surface microstructure and thus the thermochromic efficiency [176,184]. In some cases VO 2 films that consisted of nanoparticles have been found to result in wider hysteresis widths (10-20 • C), although they tended to have lower critical transition temperatures (~40 • C) [150], it has been suggested that the hysteresis width is inversely proportional to the average crystallite and grain sizes of the materials [185,186] however, this is not found to be the case in all studies [163].…”

Section: Improving Thermochromic Efficiencymentioning

confidence: 99%

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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Near-zero IR transmission in the metal-insulator transition of VO2 thin films

Cited by 80 publications

References 14 publications

Nanothermochromics: Calculations for VO2 nanoparticles in dielectric hosts show much improved luminous transmittance and solar energy transmittance modulation

Nanothermochromics: Calculations for VO2 nanoparticles in dielectric hosts show much improved luminous transmittance and solar energy transmittance modulation

Solution Processing of Nanoceramic VO2 Thin Films for Application to Smart Windows

Thin Films for Advanced Glazing Applications

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