Electrochromism and Photochromism of WO3 Thin Films

1994 ◽  
Vol 369 ◽  
Author(s):  
C. Lefrou ◽  
O. Marrot ◽  
F. Garot
Keyword(s):  
Thin Films ◽  
Steady State ◽  
Insertion Reaction ◽  
Electrochromic Devices ◽  
Rest Potential ◽  
Photochromic Effect ◽  
Ion Conducting ◽  
Wo3 Thin Films ◽  
Sun Light ◽  
Ion Conducting Polymer

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.

Electrochromic Properties of Reactive Magnetron Sputtered WO3 Thin Films Prepared by Neon as Sputter Gas

2020 ◽  
Vol 20 (6) ◽  
pp. 3724-3733
Author(s):  
K. Uday Kumar ◽  
A. Subrahmanyam
Keyword(s):  
Thin Films ◽  
Maximum Efficiency ◽  
Electrochromic Device ◽  
Conducting Layer ◽  
Lithium Ions ◽  
Coloration Efficiency ◽  
Energy Applications ◽  
Sputtered Films ◽  
Ion Conducting ◽  
Wo3 Thin Films

Electrochromic phenomenon is an emerging technology for renewable energy applications. Several material oxides used for the electrochromic application, the tungsten oxide (WO3) has shown good coloration efficiency (CE). Present manuscript, we are reporting the results of the coloration efficiency of DC magnetron sputtered WO3 films for electrochromic applications (thicknesses 190 nm to 700 nm) with sputter gas neon at 300 K. Hydrogen and Lithium ions have been intercalated into WO3 lattice for coloration. The CE value is increasing with increase of thickness of WO3 thin films; CE for 700 nm thick films are: 87 cm2/C and 137 cm2/C for H+ and Li+ respectively. The coloration efficiency (CE) observed to be increasing with wavelength. The maximum efficiency of the hydrogen intercalated neon sputtered films achieved at 860 nm wavelength is about 129.9 cm2/C and for the lithium intercalatedWO3 films the maximum efficiency achieved at 780 nm with 238.5 cm2/C. These neon sputtered WO3 thin films show good stability of coloration efficiency even after 500 cycles of coloring and bleaching cycles. The work function of the colored and transparent states of WO3 thin films are 4.513 eV and 4.755 eV respectively. Finally we have fabricated the electrochromic device (ECD) prepared with nafion thin film as an ion conducting layer and the ECD has shown a maximum coloration efficiency (CE) of 112.1 cm2/C.

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

2021 ◽  
Vol 373 ◽  
pp. 115814
Author(s):  
Zhenhua Wang ◽  
Liaolin Zhang ◽  
Hongliang Zhang ◽  
Ran Jiang ◽  
Lingyan Liang ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrochromic Devices ◽  
Wo3 Thin Films

Characterization of pulsed laser deposited WO3 thin films for electrochromic devices

1999 ◽  
Vol 153 (1) ◽  
pp. 1-9 ◽  
Author(s):  
A Rougier ◽  
F Portemer ◽  
A Quédé ◽  
M El Marssi
Keyword(s):  
Thin Films ◽  
Pulsed Laser ◽  
Electrochromic Devices ◽  
Wo3 Thin Films

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

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

WO3 Thin Films Active in the IR Region

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.

Novel electrochromic devices based on complementary nanocrystalline TiO2 and WO3 thin films

1999 ◽  
Vol 350 (1-2) ◽  
pp. 269-275 ◽  
Author(s):  
Pierre Bonhôte ◽  
Eric Gogniat ◽  
Michael Grätzel ◽  
P.V Ashrit
Keyword(s):  
Thin Films ◽  
Electrochromic Devices ◽  
Nanocrystalline Tio2 ◽  
Wo3 Thin Films

Advanced electrochromic devices based on WO3 thin films

2001 ◽  
Vol 46 (13-14) ◽  
pp. 2145-2150 ◽  
Author(s):  
S Papaefthimiou ◽  
G Leftheriotis ◽  
P Yianoulis
Keyword(s):  
Thin Films ◽  
Electrochromic Devices ◽  
Wo3 Thin Films

Flexible solid-state electrochromic devices based on amorphous WO3 thin films

2013 ◽  
Author(s):  
Jianyi Luo ◽  
Runming Chen ◽  
Yangyang Zhou ◽  
Li Li ◽  
Weiyang Deng ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Electrochromic Devices ◽  
Wo3 Thin Films

Preparation and characterization of spray deposited n-type WO3 thin films for electrochromic devices

2004 ◽  
Vol 39 (10) ◽  
pp. 1479-1489 ◽  
Author(s):  
R. Sivakumar ◽  
A. Moses Ezhil Raj ◽  
B. Subramanian ◽  
M. Jayachandran ◽  
D.C. Trivedi ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrochromic Devices ◽  
Wo3 Thin Films
Sign in / Sign up

Export Citation Format

Share Document