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Polaron transitions in charge intercalated amorphous tungsten oxide thin films
Author(s) -
Saenger M. F.,
Höing T.,
Hofmann T.,
Schubert M.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200777894
Subject(s) - polaron , tungsten , bipolaron , ion , condensed matter physics , amorphous solid , materials science , physics , chemistry , electron , crystallography , quantum mechanics , metallurgy
We present a parametric dielectric function model in depen‐ dence of the intercalated charge per tungsten ion ratio x , which excellently describes the ellipsometric experimental data, and allows the identification of two polaron modes corresponding to transitions between W 4+ and W 5+ and between W 5+ and W 6+ tungsten ion sites. A competitive relation between the two polaron transitions is found. An empirical relation for the amplitude of the polaron transitions is found useful to provide a good description of the polaron transition dependence on x . (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)