Effect of preparation conditions on the optical and thermochromic properties of thin films of tungsten oxide

Durrani, S.M.A.; Khawaja, E. E.; Salim, M.A.; Al-Kuhaili, M.F.; Al-Shukri, A.M.

doi:10.1016/s0927-0248(01)00090-3

Cited by 57 publications

(31 citation statements)

References 14 publications

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“…Similar changes of the indices have been previously observed in films of some other dielectrics [16][17][18]. These have been attributed to a decrease in the density of a film upon an increase in the oxygen partial pressure.…”

Section: Us (O1) Us (O2) Us (Wo)supporting

confidence: 82%

“…It is interesting to note that in a similar investigation carried out earlier on films of tungsten oxide [17], an absorption band at photon energies much lower than the band gap energy was detected in the US(O)A type of films. Such a band was not present in pure WO 3 films and, in all other types of films, absorption in the region of this band was extremely weak.…”

Section: Us(wo)a Us(o)a Hs(wo) Hs(wo)a Hs(o) and Hs(o)a Types Asmentioning

confidence: 52%

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Effects of preparation conditions on the optical properties of thin films of tellurium oxide

Al-Kuhaili

Durrani

Khawaja

et al. 2002

J. Phys. D: Appl. Phys.

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Thin films of tellurium oxide were prepared by thermal evaporation. The effects of preparation conditions and post-deposition vacuum annealing on the optical constants of the thin films were studied. Substantial changes in the optical constants, density, structure and stoichiometry were observed following changes in the preparation conditions and annealing. The majority of the films were found to be deficient in oxygen. The presence of metallic Te was detected in films deposited on heated substrates and in all the films that were annealed. All the samples showed some degree of absorption at photon energies below the band gap. One explanation for this absorption could be oxygen deficiency and the presence of metallic Te.

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Section: Us (O1) Us (O2) Us (Wo)supporting

confidence: 82%

Section: Us(wo)a Us(o)a Hs(wo) Hs(wo)a Hs(o) and Hs(o)a Types Asmentioning

confidence: 52%

Effects of preparation conditions on the optical properties of thin films of tellurium oxide

Al-Kuhaili

Durrani

Khawaja

et al. 2002

J. Phys. D: Appl. Phys.

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“…Generating oxygen vacancies is in fact analogous to self-doping. In case of tungsten oxide [32], it has been demonstrated that vacuum annealing leads to loss of oxygen with a consequent impact on the optical properties. Chromium oxide (Cr 2 O 3 ), a widely studied TMO for its chromic properties, shows a variation in optical properties after annealing at adjusted oxygen partial pressures [11].…”

Section: Introductionmentioning

confidence: 99%

Tunable thermochromic properties of V 2 O 5 coatings

Kumar

Maury

Bahlawane

2017

Materials Today Physics

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“…The electrochromic materials are the class of materials having ability to modulate the reversible change in optical absorbance or reflectance when electrical voltage is applied to it. In addition to electrochromic, WO 3 thin films are known to have excellent photochromic [6], thermochromic [7], gasochromic [8], thermoelectric [9] and gas sensing [10,11] properties. Because of its electrochromic property, WO 3 has many direct applications in modern devices such as smart windows, large area information displays, rearview mirrors, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of precursors on the microstructural, optical, electrical and electrochromic properties of WO3 nanocrystalline thin films

Mukherjee

Sahay

2015

J Mater Sci: Mater Electron

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Spray-deposited tungsten oxide (WO 3 ) nanocrystalline thin films were investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and atomic force microscopy in order to study the precursor induced changes in their structural and morphological properties. The crystallite size and the root mean square surface roughness have been found to be minimum for the WO 3 thin films prepared using ammonium tungstate. The optical and spectral studies of the films were carried out using UV-visible spectroscopy and photoluminescence spectroscopy. Electrical transport properties of the films were studied by measuring the film resistivity as a function of temperature. Electrochromic studies of the WO 3 films were carried out from cyclic voltammetry, chronocoulometry and chronoamperometry measurements. The films grown using ammonium tungstate exhibit high electrochromic reversibility (*91 %) and large charge storage capacity. The cyclic voltammograms of the films do not change even after 50 scan cycles, confirming the electrochromic stability in the WO 3 films. Overall, the film prepared using ammonium tungstate may be a suitable candidate for electrochromic devices.

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Effect of preparation conditions on the optical and thermochromic properties of thin films of tungsten oxide

Cited by 57 publications

References 14 publications

Effects of preparation conditions on the optical properties of thin films of tellurium oxide

Effects of preparation conditions on the optical properties of thin films of tellurium oxide

Tunable thermochromic properties of V 2 O 5 coatings

Effect of precursors on the microstructural, optical, electrical and electrochromic properties of WO3 nanocrystalline thin films

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