VO2-based double-layered films for smart windows: Optical design, all-solution preparation and improved properties

Chen, Zhang; Gao, Yanfeng; Kang, Litao; Du, Jing; Zhang, Zhongtao; Luo, Hongjie; Miao, Hengfeng; Tan, Guoqiang

doi:10.1016/j.solmat.2011.05.041

Cited by 229 publications

(154 citation statements)

References 35 publications

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“…16 The metal-insulator transition can be influenced by a variety of external parameters, and recent work have considered the effects of strain [17][18][19] and lattice misfit with the substrate, 20,21 electric field or current activation, [22][23][24][25][26][27][28][29][30][31] light irradiation, [32][33][34][35][36][37][38] ion bombardment, 39,40 and gaseous ambience. 41 Considering the wealth of possibilities to modulate the properties of VO 2 -based thin films, it is not surprising that they are discussed for a vast number of applications such as thermochromic "smart" windows for energy efficient buildings, [42][43][44][45][46][47][48][49][50] variable-thermal-emittance surfaces for thermal radiation control, 51 oscillators and switches in (opto)electronics, 25,26,34,52,53 transistors of different types, 30,54,55 microcantilevers, 56,...…”

Section: Introductionmentioning

confidence: 99%

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Namura

Suzuki

et al. 2013

Journal of Applied Physics

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Thermochromic VO 2 nanorods made by sputter deposition: Growth conditions and optical modeling. Reactive dc magnetron sputtering onto glass-based substrates yielded deposits of thermochromic VO 2 with well-developed nanorods and nanowires. Their formation was promoted by high substrate temperature (above ~500 °C), sufficient film thickness, proper inlet of the reactive gas, dispersed gold "seeds" and pronounced substrate roughness. Rutherford back scattering ascertained mass thicknesses, scanning electron microscopy depicted the nanostructures, and glancing incidence Xray diffraction proved that single-phase VO 2 was normally formed. Journal of Applied PhysicsSpectrophotometric measurements of total and diffuse transmittance and reflectance on VO 2 thin films, at room temperature and ~100 °C, allowed us to determine complex dielectric functions below and above the "critical" temperature for thermochromic switching (~68 °C). These data were then used in computations based on the Bruggeman effective medium theory applied to randomly oriented prolate spheroidal structural units to derive the optical properties of the deposits.Experimental and computed data on spectral absorptance were found to be in good qualitative agreement.

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Section: Introductionmentioning

confidence: 99%

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Namura

Suzuki

et al. 2013

Journal of Applied Physics

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“…71 However, the results were not significantly better than those for n AR = 1.5 and are not further discussed here. 61 who found ΔT sol ≈ 15% together with T lum (τ < τ c ) and T lum (τ > τ c ) being 49.5% and 45%, respectively.…”

Section: A Thin Filmsmentioning

confidence: 98%

Thermochromic undoped and Mg-doped VO₂ thin films and nanoparticles: Optical properties and performance limits for energy efficient windows

Niklasson

Granqvist

2014

Journal of Applied Physics

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Undoped and Mg-doped thermochromic VO 2 films with atom ratios z ≡ Mg/(Mg + V) of 0 ≤ z < 0.21 were deposited by reactive DC magnetron sputtering onto heated glass and carbon substrates. Elemental compositions were found by Rutherford backscattering spectrometry. Optical constants were determined from transmittance and reflectance measurements and were used for modeling the optical properties of thin films and dilute nanoparticle composite layers below and above the critical temperature for thermochromic switching between a low-temperature infrared transparent state and a high-temperature infrared reflecting or absorbing state. Mgdoped films showed superior luminous transmittance T lum and solar transmittance modulation ΔT sol compared to undoped VO 2 films, and both of these parameters could be further enhanced by anti-reflection. VO 2 -containing nanocomposites had much larger values of T lum and ΔT sol than VO 2 -based films. Mg-doping was found to erode the properties of the nanocomposites. Approximate performance limits are given on T lum and ΔT sol for thermochromic VO 2 films, with and without Mg doping and antireflection coating, and also for VO 2 -containing dilute nanocomposites.--

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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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VO2-based double-layered films for smart windows: Optical design, all-solution preparation and improved properties

Cited by 229 publications

References 35 publications

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Thermochromic undoped and Mg-doped VO₂ thin films and nanoparticles: Optical properties and performance limits for energy efficient windows

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

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VO2-based double-layered films for smart windows: Optical design, all-solution preparation and improved properties

Cited by 229 publications

References 35 publications

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

Thermochromic undoped and Mg-doped VO2 thin films and nanoparticles: Optical properties and performance limits for energy efficient windows

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

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Product

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Thermochromic undoped and Mg-doped VO₂ thin films and nanoparticles: Optical properties and performance limits for energy efficient windows