Smart window coating based on nanostructured VO2 thin film

Chen, Xiqu; Lv, Qiang; Yi, Xinjian

doi:10.1016/j.ijleo.2011.07.048

Cited by 43 publications

(23 citation statements)

References 15 publications

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“…The same group later prepared double layered anti reflection coatings of TiO 2 (25 nm)/VO 2 (50 nm)/TiO 2 (25 nm) which exhibited an enhanced T lum of 57.6%. Chen et al [199] later reported higher T lum of 61.5.%. The durability of the VO 2 films has also been improved by the addition of an Al 2 O 3 over layer which was shown to provide protection against heat (300 • C for one day) and relative humidity of 95% [200].…”

Section: Improving the Aesthetics Of Thermochromic Filmsmentioning

confidence: 92%

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: 92%

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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“…There are at least 15 different vanadium oxides reported till now, such as VO, V 2 O 3 , VO 2 , V 2 O 5, V 6 O 13 and so on. Vanadium oxide thin films have been widely studied for optical, electrical, electrochemical, thermo-chromic and thermal switching materials [1][2][3][4][5][6][7][8][9][10][11]. The interest in these materials has increased in the last few years due to their potential scientific and technological applications, for example as a catalyst [12], a window for solar cells [13], electrochromic devices [14], electronic information displays [15] and color memory devices [16,17].…”

Section: Introductionmentioning

confidence: 99%

Structural And Optical Properties Of VOx Thin Films

Schneider

2015

Archives of Metallurgy and Materials

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VO x thin films were deposited on Corning glass, fused silica and Ti foils by means of rf reactive sputtering from a metallic vanadium target. Argon-oxygen gas mixtures of different compositions controlled by the flow rates were used for sputtering. Influence of the oxygen partial pressure in the sputtering chamber on the structural and optical properties of thin films has been investigated.Structural properties of as-sputtered thin films were studied by X-ray diffraction at glancing incidence, GIXD. Optical transmittance and reflectance spectra were recordedwith a Lambda 19 Perkin-Elmer double spectrophotometer. Thickness of the films was determined from the profilometry. It has been confirmed by XRD that the deposited films are composed mainly of V 2 O 5 phase. The estimated optical band gap of 2.5 eV corresponds to V 2 O 5 .Keywords: VO x thin films, reactive sputtering, microstructure, optical properties, energy band gap Cienkie warstwy VO x były nanoszone na szkło Corning metodą rozpylania magnetronowego rf. Jako katody użyto metalicznego wanadu. Były one nanoszone w komorze wypełnionej mieszaniną argonu i tlenu w różnych proporcjach przy ustalonych przepływach. Zbadano wpływ ciśnienia parcjalnego tlenu w komorze na własności strukturalne i optyczne otrzymanych warstw.Własności strukturalne cienkich warstw zostały określone metodą rozpraszania promieniowania rentgenowskiego padają-cego pod małymi kątami (GIXD). Widma optyczne transmitancji i odbicia zostały wykonane przy użyciu spektrometru Lambda 19 Perkin-Elmer. Grubość badanych warstw zmierzono za pomocą profilometru.Pomiary XRD potwierdziły, że otrzymane warstwy składają się głównie z fazy V 2 O 5 . Wyznaczona optycznie przerwa energetyczna wynosząca 2.5 eV odpowiada przerwie energetycznej V 2 O 5 .

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Smart window coating based on nanostructured VO2 thin film

Cited by 43 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 Optical Properties Of VOx Thin Films

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