scholarly journals Synthesis of Nb2O5 thin films for electrochromic devices

1995 ◽  
Vol 14 (22) ◽  
pp. 1568-1570 ◽  
Author(s):  
A. Pawlicka ◽  
M. Atik ◽  
M. A. Aegerter
Keyword(s):  
Thin Films ◽  
Electrochromic Devices

scholarly journals Color Tuning by Oxide Addition in PEDOT:PSS-Based Electrochromic Devices

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 179 ◽  
Author(s):  
Delphin Levasseur ◽  
Issam Mjejri ◽  
Thomas Rolland ◽  
Aline Rougier
Keyword(s):  
Thin Films ◽  
Iron Oxide ◽  
Conducting Polymers ◽  
Applied Voltage ◽  
Oxide Content ◽  
Electrochromic Devices ◽  
Careful Evaluation ◽  
Pedot Film ◽  
Oxide Addition ◽  
Dark Blue

Poly(3,4-ethylenedi-oxythiophene) (PEDOT) derivatives conducting polymers are known for their great electrochromic (EC) properties offering a reversible blue switch under an applied voltage. Characterizations of symmetrical EC devices, built on combinations of PEDOT thin films, deposited with a bar coater from commercial inks, and separated by a lithium-based ionic membrane, show highest performance for 800 nm thickness. Tuning of the color is further achieved by mixing the PEDOT film with oxides. Taking, in particular, the example of optically inactive iron oxide Fe2O3, a dark blue to reddish switch, of which intensity depends on the oxide content, is reported. Careful evaluation of the chromaticity parameters L*, a*, and b*, with oxidizing/reducing potentials, evidences a possible monitoring of the bluish tint.

A Novel Synthetic Route to Nb2 O 5 Thin Films for Electrochromic Devices

1994 ◽  
Vol 141 (3) ◽  
pp. L29-L30 ◽  
Author(s):  
Ronaldo C. Faria ◽  
Luis‐Otavio de S. Bulhões
Keyword(s):  
Thin Films ◽  
Synthetic Route ◽  
Electrochromic Devices

scholarly journals CHARACTERISTICS OF LITHIUM LANTHANUM TITANATE THIN FILMS MADE BY ELECTRON BEAM EVAPORATION FROM NANOSTRUCTURED La0.67-xLi 3xTiO3 TARGET

2017 ◽  
Vol 25 (2) ◽  
pp. 243-250
Author(s):  
Nguyen Nang Dinh ◽  
Le Dinh Trong ◽  
Pham Duy Long
Keyword(s):  
Thin Films ◽  
Electron Beam ◽  
Ionic Conductivity ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Electron Beam Evaporation ◽  
Electrochromic Devices ◽  
Lanthanum Titanate ◽  
Average Size ◽  
Beam Deposition

Bulk nanostructured perovskites of La0.67-xLi3xTiO3 (LLTO) were prepared by using thermally ball-grinding from compounds of La2O3, Li2CO3 and TiO2. From XRD analysis, it was found that LTTO materials were crystallized with nano-size grains of an average size of 30 nm. The bulk ionic conductivity was found strongly dependent on the Li+ composition, the samples with x = 0.11 (corresponding to a La0.56Li0.33TiO3 compound) have the best ionic conductivity, which is ca. 3.2 x 10-3 S/cm at room temperature. The LLTO amorphous films were made by electron beam deposition. At room temperature the smooth films have ionic conductivity of 3.5 x 10-5  S/cm and transmittance of 80%. The optical bandgap of the films was found to be of 2.3 eV. The results have shown that the perovskite La0.56Li0.33TiO3  thin films can be used for a transparent solid electrolyte in ionic battery and in all-solid-state electrochromic devices, in particular.    

scholarly journals Electrochromic Devices Based on Porous Tungsten Oxide Thin Films

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Y. Djaoued ◽  
S. Balaji ◽  
R. Brüning
Keyword(s):  
Thin Films ◽  
Transition Metal Oxides ◽  
Structural Phase ◽  
Phase Changes ◽  
Optical Modulation ◽  
Electrochromic Devices ◽  
Smart Windows ◽  
Porous Thin Films ◽  
Recent Developments ◽  
Ion Intercalation

Recent developments in the synthesis of transition metal oxides in the form of porous thin films have opened up opportunities in the construction of electrochromic devices with enhanced properties. In this paper, synthesis, characterization and electrochromic applications of porous WO3thin films with different nanocrystalline phases, such as hexagonal, monoclinic, and orthorhombic, are presented. Asymmetric electrochromic devices have been constructed based on these porous WO3thin films. XRD measurements of the intercalation/deintercalation of Li+into/from the WO3layer of the device as a function of applied coloration/bleaching voltages show systematic changes in the lattice parameters associated with structural phase transitions in LixWO3. Micro-Raman studies show systematic crystalline phase changes in the spectra of WO3layers during Li+ion intercalation and deintercalation, which agree with the XRD data. These devices exhibit interesting optical modulation (up to ~70%) due to intercalation/deintercalation of Li ions into/from the WO3layer of the devices as a function of applied coloration/bleaching voltages. The obtained optical modulation of the electrochromic devices indicates that, they are suitable for applications in electrochromic smart windows.

Thin Films of Antimony-Tin Oxide as Counter-Electrodes for Proton Working Electrochromic Devices

2001 ◽  
Vol 692 ◽  
Author(s):  
N. Naghavi ◽  
C. Marcel ◽  
L. Dupont ◽  
A. Rougier ◽  
J-M. Tarascon
Keyword(s):  
Thin Films ◽  
Tin Oxide ◽  
Optical Transmittance ◽  
Ex Situ ◽  
Visible Range ◽  
Electrochromic Devices ◽  
Counter Electrodes ◽  
Transmission Electron ◽  
Wide Range ◽  
Antimony Tin Oxide

AbstractWe report here on thin films proton-working electrochromic devices based on the wellknown tungsten oxide as the coloring electrode, and Antimony Tin Oxide (ATO) as the ionstorage counter-electrode. We show that films deposited by Pulsed Laser Deposition (PLD) technique have an apparent Sb solubility up to 70 at %, and exhibit unusual electrochromic properties. Through potentiostatic tests we'll demonstrate that depending on the composition which influences film morphology, the Sn-Sb-O films could either present a faradic or a capacitive-like behavior, associated to a color or a neutral switching over a wide range of potentials, respectively. The structural properties of ATO films are characterized by X-ray diffraction and transmission electron microscopy (TEM). Electrochromic behavior is studied by means of cyclic voltamperometry coupled with ex situ optical transmittance measurements in the visible range. The maximum proton-storage capacity is observed for ATO films containing 40–50 at % Sb, while being quasi-neutral when switching over a wide range of potentials. These compositions are finally retained for the assembly of our WO3/proton-electrolyte/ATO devices, whose performances are reported.

Symmetric naphthalenediimidequaterthiophenes for electropolymerized electrochromic thin films

2015 ◽  
Vol 3 (23) ◽  
pp. 5985-5994 ◽  
Author(s):  
V. Figà ◽  
C. Chiappara ◽  
F. Ferrante ◽  
M. P. Casaletto ◽  
F. Principato ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Properties ◽  
Electrochromic Devices ◽  
Coloration Efficiency ◽  
Physico Chemical ◽  
Donor Acceptor

Novel electropolymerized copolymers with a controlled donor/acceptor ratio obtained from symmetric naphthalenediimidequaterthiophene showed prominent physico-chemical properties and high coloration efficiency in electrochromic devices.

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