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Journal Articles Optics Letters Year : 2019

Coloration mechanism of electrochromic Na x WO3 thin films

Abstract

The coloration mechanism of tungsten trioxide (WO3) upon insertion of alkali ions is still under debate after several decades of research. This Letter provides new insights into the reversible insertion and coloration mechanisms of Na+ ions in WO3 thin films sputter-deposited on ITO/glass substrates. A unique model based on a constrained spline approach was developed and applied to draw out ε1+iε2 from spectroscopic ellipsometry data from 0.6 to 4.8 eV whatever the state of the electrochromic active layer, i.e. as-deposited, colored or bleached. It is shown that electrochemically intercalated sodium-tungsten trioxide, NaxWO3 (x=0.1, 0.2, 0.35), exhibits an absorption band centered at ca. 1.14 eV in 2 governing the coloration mechanism.
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hal-02900737 , version 1 (12-07-2021)

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Alexandre Zimmer, Mickaël Gilliot, Manuel Tresse, Laurent Broch, Kessein Eric Tillous, et al.. Coloration mechanism of electrochromic Na x WO3 thin films. Optics Letters, 2019, 44 (5), pp.1104-1107. ⟨10.1364/OL.44.001104⟩. ⟨hal-02900737⟩
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