Temperature-induced metal–semiconductor transition in W-doped VO2 films studied by photoelectron spectroscopy

Romanyuk, Andriy; Steiner, Roland; Marot, L.; Oelhafen, P.

doi:10.1016/j.solmat.2007.06.013

Cited by 97 publications

(68 citation statements)

References 20 publications

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“…In this context, Tungsten (W) is known to be the most promising cation to cut down T t by the extent of 20-26°C per at% [114]. However, careful attention must be paid when employing tungsten' dopant as it seems to reduce both T lum and ΔT sol [115]. Apart from the slight discordance in Liu and coworker's experiment [116], the results of other reviewed papers [70,117] concur well with the above.…”

Section: Dopingsupporting

confidence: 52%

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Seyfouri

Binions

2017

Solar Energy Materials and Solar Cells

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Section: Dopingsupporting

confidence: 52%

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Seyfouri

Binions

2017

Solar Energy Materials and Solar Cells

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“…Previous studies suggested that introduction of W would break V 4+ -V 4+ bonds and the new V 3+ -W 4+ and V 3+ -V 4+ bonds formed and result in nonstoichiometric vanadium oxides, which destabilizes the semiconducting phase of VO 2 and lowers the transition temperature of VO 2 films from monoclinic phase to tetragonal phase 14, 16 . Recently, studies evidenced that W replaces V in VO 2 lattice leading to local stress in VO 2 , which results in the decrease of the activation energy for the M-R phase transition, thus, reduce the MIT temperature 39, 40 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and thermochromic property studies on W doped VO2 films fabricated by sol-gel method

Pan

Yin

et al. 2017

Sci Rep

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Tungsten-doped VO2 thin films have been synthesized by a modified sol–gel process and followed by a post annealing. Vanadium pentoxide and tungstic acid as raw materials with the addition of hydrogen peroxide, concentrated hydrochloric acid (catalyst) and oxalic acid used as reducing agent were reacted in isobutanol. Finally, the uniform sol of vanadyl oxalate in isobutanol solvent was obtained as precursor. Detailed study suggested that W doped in VO2 introduces additional electron carriers and induces the formation of V3+. Post annealing under vacuum promotes the releasing of chemical stress and generates oxygen vacancies in the samples. Temperature dependent transmittance study revealed that the releasing of chemical stress and deliberately introducing oxygen vacancies in W-doped VO2 films have positive effects on enhancing its switching ability in the infrared transmittance as the metal-insulator transition (MIT) occurs. The largest switching of transmittance was obtained about 48% in the infrared range at 43 °C in 1.5%W doped VO2 films, which is significantly larger than the reported ones. The findings in this work open a new way to synthesize the novel and thermochromic W doped VO2 films with facility and low cost. Therefore, it has extensive application to construct smart windows and electronic devices.

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“…First, bulk VO 2 has c Ϸ 68°C, 7 which obviously is too high for buildings-related applications, but doping with transition metal ions having a valency 6+ and 5+ can decrease c . 15 The most extensively studied dopant is W 6+ , which can bring c to room temperature without deteriorating the thermochromism; [16][17][18] the amount of tungsten for doing this seems to depend on the degree of crystalline order in the VO 2 but the relationship is not well understood. The addition of some W 6+ does not have any large effect on the optical properties.…”

Section: Introductionmentioning

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

234

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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Temperature-induced metal–semiconductor transition in W-doped VO2 films studied by photoelectron spectroscopy

Cited by 97 publications

References 20 publications

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Synthesis and thermochromic property studies on W doped VO2 films fabricated by sol-gel method

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

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