Abstract
<p class="PaperAbstract"><span lang="EN-US">Tungsten oxide (WO<sub>3</sub>) thin films were prepared by a simple, economical, chemical bath deposition method onto fluorine doped tin oxide (FTO) coated glass substrates. The electrochemical properties of the films were characterized by cyclic voltammetry. The obtained films exhibited electrochromism, changing color from initially colorless to deep blue, and back to colorless. Visible transmittance spectra of (WO<sub>3</sub>) films were recorded in-situ in their both, bleached and colored states. From those spectra, absorption coefficient (</span><span lang="EN-US">a</span><span lang="EN-US">) and the optical energy gaps were evaluated. The dependence of the optical density on the charge density was examined and the coloration efficiency (</span><span lang="EN-US">h</span><span lang="EN-US">) was calculated to be 22.11 cm<sup>2 </sup>C<sup>-1</sup>. The response times of the coloring and bleaching to an abrupt potential change from -2.5 V to +2.5 V and reverse, were found to be 9.3 and 1.2 s respectively. The maximum light intensity modulation ability of the films, when the AM1.5 spectrum is taken as an input, was calculated to be about 50 %.</span></p>
Highlights
Electrochromism is a unique property of the material to change reversibly its optical properties when it is electrochemically reduced or oxidized [1]
The cyclic voltammetric (CV) curves showed an increase of the cathodic current density to -0.86 mA cm-2 at -0.8 V, due to the reduction process occurring in the film and its switching to the blue color, whereas the anodic peak is observed at around - 0.541 V due to the oxidation process and bleaching of the film
The coloring process is followed by reduction of WVI ions and double injection of potassium ions and electrons, and the bleaching process is followed by oxidation of WV ions and double extraction of potassium ions and electrons
Summary
Electrochromism is a unique property of the material to change reversibly its optical properties when it is electrochemically reduced or oxidized [1]. The target of this research is to investigate electrochromic properties of WO3 thin films prepared by a simple chemical bath deposition method [24] and their possible application for solar light modulation.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Electrochemical Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
