Influence of proton insertion on the conductivity, structural and optical properties of amorphous and crystalline electrochromic WO3 films

Kamal, H.; Akl, Alaa A.; Abdel-Hady, K.

doi:10.1016/j.physb.2004.03.088

Cited by 111 publications

(85 citation statements)

References 71 publications

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“…The η=72.67 cm 2 C −1 is shown for the film annealed 250°C in particular. Moreover, compared with other literatures, this value is either superior or comparable for WO 3 films [26][27][28][29]. However, further increase of annealing temperature directly leads to decrease of η and that of the film annealed at 550°C is only 8.54 cm 2 C −1 .…”

Section: Optical and Electrochemical Propertiesmentioning

confidence: 55%

Efficient electrochromic device based on sol–gel prepared WO3 films

Zhao

Zhang

Dong

et al. 2015

Ionics

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Tungsten oxide (WO 3 ) films were prepared on indium-tin oxide (ITO) glass by sol-gel method. The influence of annealing temperature on the structural, morphological, optical, electrochemical, and electrochromic properties has been investigated. The film annealed at 250°C with an amorphous structure exhibits a noticeable electrochromic performance, such as the highest optical modulation of 58.5 % at 550 nm, high electrochemical stability, and excellent reversibility (Q b /Q c =96.3 %). An electrochromic (EC) device based on WO 3 /NiO complementary structure shows improved performance. It exhibits high optical transmittance modulation of 62 % at 550 nm, excellent cycling stability, and relatively fast electrochromic response time (10 s for coloration and 19 s for bleaching).

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Section: Optical and Electrochemical Propertiesmentioning

confidence: 55%

Efficient electrochromic device based on sol–gel prepared WO3 films

Zhao

Zhang

Dong

et al. 2015

Ionics

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“…The grain size estimated from the intense peak at d = 3.65 Å ($45 nm) however, remains unaffected. Kamal et al [15] also observed an increase in the degree of crystallinity and phase change as well, in WO 3 films deposited by rf magnetron sputtering upon coloration. The authors [15] observed a triclinic (WO 3 ) to tetragonal (H 0.1-0.33 WO 3 ) phase transition.…”

Section: Structural and Microstructural Features Of Wo 3 Filmsmentioning

confidence: 84%

A comparison of electrochromic properties of sol–gel derived amorphous and nanocrystalline tungsten oxide films

Deepa

Singh

Shivaprasad

et al. 2007

Current Applied Physics

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“…Crystalline WO 3 films have a different coloration mechanism than that of amorphous WO 3 films. In the case of crystalline WO 3 films, electrochromism is attributed to Drude-like free electron absorption with a behaviour very similar to a heavily doped semiconductor with ionized impurities [52,53], and can be explained by the double injection model. When electrons and ions from the electrolyte diffuse in the films, then electrons enter the extended states of conduction band, and the majority of ions are delocalized around the lattice sites, which behave like scattering centers for the intercalated electrons.…”

Section: Electrochromic Studiesmentioning

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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Influence of proton insertion on the conductivity, structural and optical properties of amorphous and crystalline electrochromic WO3 films

Cited by 111 publications

References 71 publications

Efficient electrochromic device based on sol–gel prepared WO3 films

Efficient electrochromic device based on sol–gel prepared WO3 films

A comparison of electrochromic properties of sol–gel derived amorphous and nanocrystalline tungsten oxide films

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

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