Mechanistic insights into the dry prelithiated WO3 thin films in electrochromic devices

AbstractA photochromic effect is observed in WO3-based electrochromic devices with an ion-conducting polymer as electrolyte. Upon exposure to sun light, the electrochromic cells become blue. This is due to a change of color of the WO3 electrode. The photoeffect on this layer is due to a simultaneous insertion reaction (reduction) of the WO3 material and a photooxidation of water contained in the polymer. It is reversible and therefore not destructive for the complete device. The study of the transmittance and rest potential as a function of the time of exposure to light shows that a steady state is reached in c.a. 10 hours. The addition of U.V.-cut filters changes the reached steady-state, indicating that the photochromic effect is dependent upon the structure of the WO3 material.

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Studies on the effect of substrate temperature on (VI–VI) textured tungsten oxide (WO3) thin films on glass, SnO2:F substrates by PVD:EBE technique for electrochromic devices

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2004.06.028 ◽

2004 ◽

Vol 87 (2-3) ◽

pp. 439-445 ◽

Cited By ~ 35

Author(s):

R. Sivakumar ◽

M. Jayachandran ◽

C. Sanjeeviraja

Keyword(s):

Thin Films ◽

Substrate Temperature ◽

Tungsten Oxide ◽

Electrochromic Devices ◽

Wo3 Thin Films

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Detailed transmittance analysis of high-performance SnO2-doped WO3 thin films in UV–Vis region for electrochromic devices

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-020-04444-x ◽

2020 ◽

Vol 31 (21) ◽

pp. 19074-19084

Author(s):

Ali Olkun ◽

Suat Pat ◽

Nihan Akkurt ◽

Reza Mohammadigharehbagh ◽

Uğur Demirkol ◽

...

Keyword(s):

Thin Films ◽

High Performance ◽

Electrochromic Devices ◽

Wo3 Thin Films

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WO3 Thin Films Active in the IR Region

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.55.30 ◽

2008 ◽

Vol 55 ◽

pp. 30-35

Author(s):

Katherine Sauvet ◽

Laurent Sauques ◽

Olivier Durand ◽

Jacques Perrière ◽

Jean Bernard Ledeuil ◽

...

Keyword(s):

Thin Films ◽

Radio Frequency ◽

Single Layer ◽

Liquid Electrolyte ◽

Chamber Pressure ◽

Film Morphology ◽

Electrochromic Devices ◽

Electrochromic Properties ◽

Wo3 Thin Films ◽

Deposition Conditions

This paper reports the enhancement of the electrochromic properties in the infrared, IR, region of radio frequency sputtered WO3 thin films thanks to a careful optimization of the deposition conditions. From the combination of various techniques of characterization, the optical performances, in particular, the contrast in reflectance between the inserted state and the deinserted one, upon cycling in H3PO4 liquid electrolyte, are correlated to the film morphology and composition. Films, grown in higher chamber pressure, exhibiting a lower density and a O/W ratio higher than 3, show the most promising behavior. Finally, first trends on the incorporation of the WO3 single layer in full electrochromic devices are discussed.

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