10.1021/jp502092h.s001
Maria Vasilopoulou
Maria
Vasilopoulou
Ioannis Kostis
Ioannis
Kostis
Nikolaos Vourdas
Nikolaos
Vourdas
Giorgos Papadimitropoulos
Giorgos
Papadimitropoulos
Antonios Douvas
Antonios
Douvas
Nikolaos Boukos
Nikolaos
Boukos
Stella Kennou
Stella
Kennou
Dimitris Davazoglou
Dimitris
Davazoglou
Influence
of the Oxygen Substoichiometry and of the Hydrogen Incorporation on the Electronic Band Structure
of Amorphous Tungsten Oxide Films
American Chemical Society
2014
Oxygen Substoichiometry
plasma oscillations
1 eV
latter case
oxygen substoichiometry
tungsten oxide films
tungsten oxide
hydrogen incorporation
CB
hydrogen ions
Hydrogen Incorporation
energy gap
IB
conduction band
Electronic Band Structure
tungsten ions
stoichiometric tungsten oxide
Amorphous Tungsten Oxide FilmsThe influence
2014-06-19 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Influence_of_the_Oxygen_Substoichiometry_and_of_the_Hydrogen_Incorporation_on_the_Electronic_Band_Structure_of_Amorphous_Tungsten_Oxide_Films/2281405
The
influence of the oxygen substoichiometry and of the hydrogen incorporation
on the electronic structure of amorphous tungsten oxide films was
investigated. It was found that both of them cause the appearance
of intermediate bands (IBs) within the energy gap; approximately 3
and 1 eV below the edge of the conduction band (CB), respectively.
The hydrogen is incorporated into the W–O network bonding either
to the oxygen or to the tungsten ions. In the former case, the electronic
structure of the material retains the characteristics of amorphous
stoichiometric tungsten oxide with, additionally, the two IBs. In
the latter case, the electronic structure of tungsten oxide is seriously
perturbed because in addition to the IBs the 1s orbitals of the hydrogen
also contribute to the formation of the edges of valence and CBs causing
the delocalization of electrons. Carriers donated by the incorporated
hydrogen ions are excited in the CB, causing plasma oscillations and
red shifting photoluminescence.