Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3313945
Keywords
energy gap; light absorption; nanostructured materials; photoacoustic spectroscopy; thin films; tungsten compounds
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Funding
- FAPESB/PRONEX [PNX0005/2007]
- CAPES
- Fundacao Araucaria
- Swedish Research Council
- Swedish Energy Agency (STEM)
- European EM ECW Programme EUBRANEX
- PDC/NSC via SNIC/SNAC
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The optical band-gap energy of a nanostructured tungsten trioxide film is determined using the photoacoustic spectroscopy method under continuous light excitation. The mechanism of the photoacoustic signal generation is discussed. The band-gap energy is also computed by other methods. The absorption coefficient as well as the band-gap energy of three different crystal structures of tungsten trioxide is calculated by a first-principles Green's function approach using the projector augmented wave method. The theoretical study indicates that the cubic crystal structure shows good agreement with the experimental data.
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