Coloration of tungsten oxide electrochromic thin films at high bias potentials and low intercalation levels

Rojas González, Edgar AlonsoUppsala universitet,Fasta tillståndets fysik (författare)

The optical absorption of amorphous tungsten oxide thin films was studied at low intercalation levels. The electronic density of states was obtained by an electrochemical method and bias potential regions were assigned to the conduction band and gap states according to the experimentally estimated conduction band edge. Differences between the coloration in the conduction band and gap states were observed when comparing the experimental results to a theoretical site-saturation model that considers electronic transitions between localized tungsten sites. The model could reproduce the optical response due to conduction band states. However, it underestimated the rate of change of the optical absorption coefficient with intercalation level for gap states. This discrepancy is discussed in the context of small-polaron optical absorption.

TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
Amorphous materials; Sputtering; Optical materials and properties
Engineering Science with specialization in Solid State Physics
Teknisk fysik med inriktning mot fasta tillståndets fysik

Niklasson, Gunnar,1953-Uppsala universitet,Fasta tillståndets fysik(Swepub:uu)gni26208 (författare)
Uppsala universitetFasta tillståndets fysik (creator_code:org_t)

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