Lifetime of electrochromism of amorphous WO3-TiO2 thin films.

Matsuoka, Hiroaki; Hashimoto, Satoshi; Kagechika, Hiroshi

doi:10.4139/sfj.42.246

Cited by 4 publications

(7 citation statements)

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“…The decrease results from the decrease of the coloring site in the film by the substitution of TiO2 for a part of WO3. We confirmed that the crystal structure of amorphous WO3 was modified by the presence of TiOz (7).…”

Section: Resultssupporting

confidence: 74%

“…However, the two peaks of the WO3-TiO2 film shift to a high wavenumber, The shifts prove that the length of the W--O bond decreases because of the doped TiO2. It is confirmed that the bond length of W--O in the WO3-TiO2 film decreases from the results of x-ray diffraction (7).…”

Section: Resultssupporting

confidence: 58%

“…The lifetimes of these films still exceed that of the WO3 film. On the other hand, the efficiency of the coloration of the WO~-TiO2 films is found to decrease in proportion to the concentration of TiO2 (7). The efficiency is defined as the change of the optical density per the injected charge density.…”

Section: Resultsmentioning

confidence: 99%

“…Chemical vapor deposition (CVD), together with other vacuum methods, is generally employed for the deposition of SnO~ film (7). When the films are prepared by CVD, tin chloride compound, such as SnCI4 is often used as a source material because of its low price and easy volatilization.…”

Section: Introductionmentioning

confidence: 99%

“…We found that the lifetime increases when WO3-TiO2 films are used as the electrochromic layer. X-ray diffraction revealed that the stability of the films against the crystallization during the coloring and bleaching cycles is a reason for the long lifetime (7).…”

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confidence: 99%

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Lifetime of Electrochromism of Amorphous WO 3 ‐ TiO2 Thin Films

Hashimoto

Matsuoka

1991

J. Electrochem. Soc.

165

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The degradation of the electrochromism of amorphous WO3 and WO3‐TiO2 films prepared by electron‐beam deposition have been studied. The lifetime of the WO3‐TiO2 films is five times longer than that of the WO3 films. SIMS and XPS analyses have revealed that lithium accumulates as OLi in the WO3 films, but that it cannot accumulate in the WO3‐TiO2 film. O1s electron energy loss spectroscopy (EELS) spectra have indicated that the change of the electronic structure for the WO3‐TiO2 film by coloration is smaller than that for the WO3 film. The increase of plasmon energy has been obtained in low loss EELS spectrum and the increase of the bond length in the WO3‐TiO2 film has been measured by Raman spectrum. From these results, the number of the defect bonds as a trapping site of lithium is reduced and the bond length of W‐O decreases in the WO3‐TiO2 films. We conclude that lithium cannot accumulate in the structure of the WO3‐TiO2 film and that the structure gives a prolonged lifetime to the electrochromism.

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Section: Resultssupporting

confidence: 74%

Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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