Abstract
Electrochromic (EC) properties of tungsten-molybdenum oxide (W1-y MoyO3) thin films were investigated. The films were deposited on indium tin oxide covered glass by reactive DC sputtering from tungsten and molybdenum targets. Elemental compositions of the W1-y MoyO3 films were determined by Rutherford back scattering. Voltammetric cycling was performed in an electrolyte of 1 M LiClO4 in propylene carbonate. An increase in molybdenum content in the EC films caused both a shift towards higher energies and a lowering of the maximum of the optical absorption band, as compared with WO3 EC films. Durability under electrochemical cycling was diminished for W1-y MoyO3 EC films.
Highlights
Electrochromic (EC) materials are capable of undergoing reversible optical changes when an electrochemical potential is applied
Compositional characterization Elemental characterization of the films was performed with Rutherford backscattering spectrometry (RBS) using 2 MeV 4He ions backscattered at an angle of 170°
After the 20th cycle, the Cyclic voltammetry (CV) data were stopped at the state of maximum coloration, the film was taken out from the glovebox, gently rinsed with isopropanol, dried with a nitrogen gun, and its spectral optical transmittance T(λ) and reflectance R(λ) were immediately measured in the 300 < λ < 2500 nm interval using a Perkin–Elmer Lambda 900 spectrophotometer The resulting data were used to obtain the optical absorption coefficient using the approximate expression doi:10.1088/1742-6596/682/1/012005 (1)
Summary
Electrochromic (EC) materials are capable of undergoing reversible optical changes when an electrochemical potential is applied. Molybdenum-doped spray pyrolysed WO3 EC films showed a different microstructure and crystallinity, together with better EC response for nominal concentrations around 6% Mo and better electrochemical stability for small nominal concentrations (~2% Mo) as compared with pure tungsten oxide films [12]. In this present work we prepared W1–yMoyO3 EC thin films by sputtering and studied their EC performance with focus on durability issues
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