Influence of annealing temperature on structural and dielectric properties of e-beam evaporated WO3 thin films

Madhukar, P.; Jyothi, D. Shanmukhi; Jayababu, Nagabandi; Reddy, M.V. Ramana

doi:10.1016/j.matpr.2016.11.096

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…A common way to evaluate the effective grain size as well as the degree of crystallinity of the monoclinic WO 3 layers is by evaluating the triplet peaks in the range 20 < 2θ < 30 [45,46,47]. Notice that the annealing process conduces to an increment in the crystallite size, due to the high temperature, providing nanoparticles enough energy to coalesce into larger particles promoted by the atomic diffusion [48].…”

Section: Resultsmentioning

confidence: 99%

Study of the Thermal Annealing on Structural and Morphological Properties of High-Porosity A-WO3 Films Synthesized by HFCVD

et al. 2019

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High-porosity nanostructured amorphous tungsten OXIDE (a-WO3) films were synthesized by a Hot Filament Chemical Vapor Deposition technique (HFCVD) and then transformed into a crystalline WO3 by simple thermal annealing. The a-WO3 films were annealed at 100, 300, and 500 °C for 10 min in an air environment. The films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and UV–vis spectroscopy. Results revealed that the a-WO3 films were highly porous, composed of cauliflower-like structures made of nanoparticles with average sizes of 12 nm. It was shown that the effect of annealing on the morphology of the a-WO3 films leads to a sintering process. However, the morphology is conserved. It was found that at annealing temperatures of 100 °C, the a-WO3 films are of an amorphous nature, while at 300 °C, the films crystallize in the monoclinic phase of WO3. The calculated bandgap for the a-WO3 was 3.09 eV, and 2.53 eV for the film annealed at 500 °C. Finally, the results show that porous WO3 films preserve the morphology and maintain the porosity, even after the annealing at 500 °C.

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Section: Resultsmentioning

confidence: 99%

Study of the Thermal Annealing on Structural and Morphological Properties of High-Porosity A-WO3 Films Synthesized by HFCVD

et al. 2019

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“…This process leads to the potential application of the material in smart windows, electrochromic windows, switchable devices, and optical-based gas sensors [12]. Over the past 30 years, a large body of research has been carried out to synthesize tungsten oxide films for electrochromic devices because the films exhibit a fairly good optical modulation and high cyclic stability [13,14]. The electrochromic phenomenon of tungsten oxide was originally discovered in tungsten oxide WO3 thin films.…”

Section: Introductionmentioning

confidence: 99%

Designing and Fabrication of Electrochromic Windows Using Tungsten Oxide Films Prepared Through Sol-gel Coating on a Glass

daroogheh

Karimi

Ghorashi

2019

IJOP

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In this study, a sol-gel peroxotungstic acid sol was employed to deposit tungsten oxide (WO3) films by the spin-coating technique. In view of smart window applications, electrochromic windows were then designed and fabricated using a thin tungsten oxide film. For this purpose, Glass/ FTO/ WO3/ electrolyte/ FTO/Glass could be of use due to its special structure that consists of an electrochromic layer (WO3) on a transparent conductor (FTO), an electrolyte containing Li + cations, and a transparent conductor layer. A voltage was applied on the fabricated sample, which was later assesed for its transmission, switching speed, and coloration efficiency. An increase in the coloration efficiency from 87 cm 2 /C -1 to 99.1 cm 2 /C -1 was found associated with an increase in the deposition speed. Moreover, the increase in the deposition speed led to a decrease in the coloration and bleaching time duration from 11.4 s to 6.2 s and from 12.8 s to 5.2 s respectively. The results obtained on the thin film WO3 can be useful for electrochromic applications.

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Detailed analysis of the structural, morphological, optical, electrical, and dielectric properties of the reactively produced WO3 nanostructure

Efkere,

Özçelik

2023

J Mater Sci: Mater Electron

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Influence of annealing temperature on structural and dielectric properties of e-beam evaporated WO3 thin films

Cited by 7 publications

References 7 publications

Study of the Thermal Annealing on Structural and Morphological Properties of High-Porosity A-WO3 Films Synthesized by HFCVD

Study of the Thermal Annealing on Structural and Morphological Properties of High-Porosity A-WO3 Films Synthesized by HFCVD

Designing and Fabrication of Electrochromic Windows Using Tungsten Oxide Films Prepared Through Sol-gel Coating on a Glass

Detailed analysis of the structural, morphological, optical, electrical, and dielectric properties of the reactively produced WO3 nanostructure

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