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Effect of the tungsten and molybdenum oxidation states on the thermal coloration of amorphous WO3 and MoO3 films

Papaefthimiou Spiros, Lefthériotis, Georges, Yianoulis Panayiotis, Siokou Angeliki Elina

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URIhttp://purl.tuc.gr/dl/dias/CED0111F-4562-44A2-AE18-31316D5BA093-
Identifierhttps://doi.org/10.1016/S0039-6028(01)00714-2-
Identifierhttp://www.sciencedirect.com/science/article/pii/S0039602801007142-
Languageen-
Extent6 pagesen
TitleEffect of the tungsten and molybdenum oxidation states on the thermal coloration of amorphous WO3 and MoO3 filmsen
CreatorPapaefthimiou Spirosen
CreatorΠαπαευθυμιου Σπυριδωνel
CreatorLefthériotis, Georgesen
CreatorYianoulis Panayiotisen
CreatorSiokou Angeliki Elinaen
PublisherElsevieren
Content SummaryTransmission and X-ray photoelectron spectroscopy (XPS) was used to investigate the optical and electronic changes caused by thermal annealing in UHV of amorphous WO3 and MoO3 thin films suitable for electrochromic applications. The core level XPS measurements showed that annealing in UHV progressively reduces the oxides to the lower oxidation states and causes changes in their color. Their luminous transmittance was related to their state of oxidation at each annealing temperature during thermal coloration. Only the O2p peak characterizes the valence band spectra of the oxides before coloration. After annealing, the 5d and 6s states of tungsten and 4d, 5s of molybdenum are partially filled by electrons released due to the reduction of the oxides. The MoO3 film exhibits deep blue coloration below 400°C, associated to a continuous distribution between Mo6+ and Mo5+ states. For the WO3 film the W4+ state, which appears above 400°C, plays the dominant role in deep coloration. At lower temperatures distinct W5+ states are formed with a limited contribution to coloration.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-10-24-
Date of Publication2001-
SubjectX-ray photoelectron spectroscopyen
SubjectEvaporation and sublimationen
SubjectTungsten oxideen
SubjectMolybdenum oxidesen
Bibliographic CitationSiokou, G. Leftheriotis, S. Papaefthimiou and P. Yianoulis, "Effect of the tungsten and molybdenum oxidation states on the thermal coloration of amorphous WO3 and MoO3 films", Surf. Sci., vol. 482-485, pt. 1, pp. 294–299, Jun. 2001. doi: 10.1016/S0039-6028(01)00714-2.en

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