Electrochromic colour centres in amorphous tungsten trioxide thin films |
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Authors: | JV Gabrusenoks PD Cikmach AR Lusis JJ Kleperis GM Ramans |
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Institution: | Solid State Physics Institute, Latvian State University, Riga, USSR |
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Abstract: | Amorphous tungsten trioxide films, investigated by the Raman scattering method, are shown to be composed of a spatial network of tightly bound (WO6)n·mH2O clusters with a large number of terminal oxygen W=O and W-O-W bonds between clusters. The injected electrons in an amorphous tungsten trioxide film are localized in the tungsten 5d orbitals in an axially distorted octahedron, as is shown by ESR analysis. The optical absorption of a coloured amorphous tungsten trioxide film, as has previously been proposed, can be satisfactorily described by an intervalence charge-transfer transition between localized W5+ and W6+ states. |
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