Electrochromic Devices Based on Porous Tungsten Oxide Thin Films

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 WO3 thin films wi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of nanomaterials 2012-01, Vol.2012 (2012), p.1-9
Main Authors: Djaoued, Y., Brüning, R., Balaji, S.
Format: Article
Language:English
Subjects:
Annealing
Devices
Electric potential
Electrochromism
Glass substrates
Intercalation
Modulation
Nanomaterials
Spectrum analysis
Studies
Symmetry
Temperature
Thin films
Tungsten oxides
Voltage
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 WO3 thin films with different nanocrystalline phases, such as hexagonal, monoclinic, and orthorhombic, are presented. Asymmetric electrochromic devices have been constructed based on these porous WO3 thin films. XRD measurements of the intercalation/deintercalation of Li+ into/from the WO3 layer 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 WO3 layers 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 WO3 layer 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.
ISSN:1687-4110
1687-4129
DOI:10.1155/2012/674168