Trapped electrons in substoichiometric MoO3 observed by X-ray electron spectroscopy |
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| Authors: | J.Wayne Rabalais Richard J. Colton Alberto M. Guzman |
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| Affiliation: | Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA;Carnegie-Mellon University, Division of Sponsored Research, Pittsburgh, Pennsylvania 15213, USA |
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| Abstract: | Substoichiometric amorphous thin films of MoO3 in both the transparent and absorptive forms have been studied by X-ray electron spectroscopy. The transparent films can be colored blue (absorptive) electrically or by UV irradiation. The electron distribution curve of the blue film exhibits a small band near the Fermi edge which is absent in the transparent sample. This new band is attributed to electrons trapped in positively charged anion vacancies in the substoichiometric MoO3 lattice. This model provides an interpretation of the electrical conductivity and color of the films. |
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