Optimization of antireflection coating for VO2-based energy efficient window

Xu, Gang; Jin, Ping; Tazawa, Masato; Yoshimura, Kazuyoshi

doi:10.1016/j.solmat.2004.02.014

Cited by 180 publications

(101 citation statements)

References 15 publications

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“…40% to 50%-55% at 650 nm with 100 nm anti reflection coating. ZrO 2 over layer anti reflection coatings have also been used, where a T lum of 55% was obtained [197]. Particularly good properties have been obtained by multilayer films consisting of TiO 2 and VO 2 ; Tazawa et al [198] demonstrate that in addition to improving the visible light transparency of the films, production of TiO 2 anti reflection layers can also offer multifunctional properties, combining thermochromic response with self-cleaning properties.…”

Section: Improving the Aesthetics Of Thermochromic Filmsmentioning

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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Section: Improving the Aesthetics Of Thermochromic Filmsmentioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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“…It should be noted that such coatings may be desired not only for oxidation protection but for their optical functionality. Thus the top coating can provide anti-reflection and thereby enhance the luminous transmittance, which is advantageous for windows-related applications [11,16], and studies have been reported for anti-reflecting layers based on oxides of Si [32][33][34][35][36][37], Ti [36][37][38][39][40][41][42], Zr [43] and Al [37]. It is likely that some or all of these oxide layers are able to impart oxidation protection of the underlying VO 2 .…”

Section: Conclusion and Remarksmentioning

confidence: 99%

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

Niklasson

et al. 2014

Thin Solid Films

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An explorative study was performed on sputter-deposited thermochromic (TC) VO 2 films exposed to heat treatment under dry and humid conditions. The ambient conditions were harsh and 80-nm-thick VO 2 films rapidly converted to non-TC V 2 O 5 . It was found that a 30-nm-thick sputter-deposited Al oxide top coating provided good protection and delayed the oxidation for more than one day upon heating in dry air at 300 °C and that protection occurred for several days at 95 % relative humidity and 60 °C. The thickness of the Al oxide was important and, expectedly, increased thickness yielded enhanced protection. Our results are important for TC fenestration as well as for other technical applications.

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“…This first-order transition is accompanied by a large change of electrical resistivity and reflectance in the infrared region [1] which makes these materials attractive for applications such as optical/electrical switching devices [2][3][4], electrochromic systems [5], data storage devices [6,7], etc. Among them, VO 2 is the most interesting because its transition temperature is close to room temperature, ~68ºC [1], and therefore is being under many studies in an effort to apply it in smart energy efficient windows with active solar control [8][9][10][11][12]. The stoichiometry of VO 2 has been reported as a determinant factor for an improved thermochromic performance [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Structural and Morphological Characterization of Magnetron Sputtered Nanocrystalline Vanadium Oxide Films for Thermochromic Smart Surfaces

Batista

Teixeira

Carneiro

2008

JNanoR

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Nanocrystalline vanadium oxide thin films have been deposited by reactive DC magnetron sputtering onto glass substrates under different processing conditions. Structural analysis and phase identification have been carried out by means of X-ray diffractometry (XRD). The surface morphologies of the different films have been examined by both scanning electron microscopy (SEM) and atomic force microscopy (AFM). The XRD results revealed single and multiple phase oxides such as VO 2 (B), VO 2 (M), V 2 O 5 , etc. with considerable differences concerning to surface morphologies, as observed by SEM and AFM. The effects the O 2 /Ar flow ratio, DC current, and working pressure on the phases formed and growth rates is discussed. Moreover, VO 2 (M) films exhibited different morphologies concerning to grain size and shape as well as dissimilar preference in crystal orientation, as a result of the processing conditions. The optical/thermochromic response of the VO 2 (M) specimens deposited under different growth rate conditions was evaluated by optical spectrophotometry and related to the respective structural characteristics.

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Optimization of antireflection coating for VO2-based energy efficient window

Cited by 180 publications

References 15 publications

Thin Films for Advanced Glazing Applications

Thin Films for Advanced Glazing Applications

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

Structural and Morphological Characterization of Magnetron Sputtered Nanocrystalline Vanadium Oxide Films for Thermochromic Smart Surfaces

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