Multilayer ITO/VO 2 /TiO 2 thin films for control of solar and thermal spectra

Miller, Mark J.; Wang, Junlan

doi:10.1016/j.solmat.2016.04.044

Cited by 30 publications

(16 citation statements)

References 20 publications

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“…The layers gave low-emissivity, thermochromic and anti-reflection functionality. The authors were able to demonstrate that such a stack retained thermochromic possibilities, although these were some way from the ideal, indicating further work needs to be done to optimise the system [202]. The investigation of periodic porous structures is a very recent development in thermochromic thin films.…”

Section: Recent Advances In Thermochromic Glazingmentioning

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: Recent Advances In Thermochromic Glazingmentioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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“…The temperature range for the thermochromic transition was studied by measuring optical transmittance at l = 2,000 nm, where the temperature-induced change is particularly large, for films of VO 2 and TiO 2 /VO 2 . Figure 1D shows that the transmittance change occurs in an interval around $68 C, i.e., at the ''critical'' temperature for bulk VO 2 16 ; the transition exhibits hysteresis and has a mid-transition width of $12 C. It is well known that strain and crystallite size affect t c , 53,63,67 and hence our data indicate that the VO 2 film has a relaxed structure with good crystallinity; this result is consistent with the occurrence of a distinct VO 2 (011) peak in XRD (Figure S3A). The change in the appearance of the hysteresis curve in Figure 1D with the addition of a TiO 2 layer is attributed to a difference in strain exerted on the VO 2 film as a result of lattice mismatch between the two materials.…”

Section: Optical Properties and Thermochromismmentioning

confidence: 96%

Synergistic TiO2/VO2 Window Coating with Thermochromism, Enhanced Luminous Transmittance, and Photocatalytic Activity

Mattsson

Niklasson

et al. 2019

Joule

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Modern buildings tend to be ''energy guzzlers'' and have indoor environments with unhealthy air. Glazing with TiO 2 /VO 2 bilayer coatings (1) exhibits enhanced photocatalytic air purification compared with single-layer TiO 2 due to heating from the underlying infrared-absorbing VO 2 film, (2) is thermochromic thanks to the VO 2 and admits less solar energy inflow when there is a cooling demand, and (3) has significantly improved luminous transmittance as a result of antireflection due to TiO 2. These coatings were deposited by reactive DC magnetron sputtering onto heated glass; they were nanocrystalline, and the anatase phase prevailed in TiO 2. The VO 2 coatings showed well-developed thermochromism. The photocatalytic degradation rate of stearic acid was almost doubled for the TiO 2 /VO 2 bilayer film compared with that for single-layer TiO 2. Our results demonstrate an important, and hitherto unexplored, synergy between photocatalysis, thermochromism, and high luminous transmittance which exploits spectral-selective material properties for solar illumination.

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“…The transmittance difference in near-infrared region could be increased by increasing the thickness of VO 2 , thereby improving solar modulation ability. But as the thickness increased, the absorption of VO 2 in visible region was enhanced, which in turn led to a loss in luminous transmittance [134][135][136]. When VO 2 was constructed into a PC, the equivalent refractive index was reduced due to periodic ordered macroporous structure of PC, which reduced reflection in visible region and improved luminous transmittance.…”

Section: Thermochromic Pcsmentioning

confidence: 99%

Review: smart windows based on photonic crystals

Feng

Yang

et al. 2020

J Mater Sci

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Smart windows control indoor solar radiation by regulating the transmittance of light, which is a promising way to reduce building energy consumption. The advent of photonic crystals (PCs) has accelerated the industrialization of smart windows. The combination of static and dynamic regulation can be realized based on the photon control function of photonic band gaps, which is expected to achieve the ideal effect of light transmission and heat control. This paper reviews recent advances of electrochromic and thermochromic smart windows based on PCs. Firstly, theory, materials, performance and development of electrochromic and thermochromic smart windows based on PCs are briefly outlined. Typical structures of electrochromic and thermochromic PCs are introduced in detail, from preparation process, morphology characterization and performance analysis, which provides directions for the future development and construction of smart windows based on PCs. Finally, challenges and opportunities facing next-generation smart windows are summarized.

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Multilayer ITO/VO 2 /TiO 2 thin films for control of solar and thermal spectra

Cited by 30 publications

References 20 publications

Thin Films for Advanced Glazing Applications

Thin Films for Advanced Glazing Applications

Synergistic TiO2/VO2 Window Coating with Thermochromism, Enhanced Luminous Transmittance, and Photocatalytic Activity

Review: smart windows based on photonic crystals

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