Publicación:
The Urbach focus and optical properties of amorphous hydrogenated SiC thin films

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dc.contributor.author Guerra, JA es_PE
dc.contributor.author Angulo, JR es_PE
dc.contributor.author Gomez, S es_PE
dc.contributor.author Llamoza, J es_PE
dc.contributor.author Montanez, LM es_PE
dc.contributor.author Tejada, A es_PE
dc.contributor.author Tofflinger, JA es_PE
dc.contributor.author Winnacker, A es_PE
dc.contributor.author Weingartner, R es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2016
dc.description.abstract We report on the optical bandgap engineering of sputtered hydrogenated amorphous silicon carbide (a-SiC:H) thin films under different hydrogen dilution conditions during the deposition process and after post-deposition annealing treatments. The Tauc-gap and Urbach energy are calculated from ultraviolet-visible optical transmittance measurements. Additionally, the effect of the thermal annealing temperature on the hydrogen out-diffusion is assessed through infra-red absorption spectroscopy. A new model for the optical absorption of amorphous semiconductors is presented and employed to determine the bandgap as well as the Urbach energy from a single fit of the absorption coefficient. This model allowed the discrimination of the Urbach tail from the Tauc region without any external bias. Finally, the effect of the hydrogen dilution on the band-edge and the Urbach focus is discussed.
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.doi https://doi.org/10.1088/0022-3727/49/19/195102
dc.identifier.isi 375255500010
dc.identifier.uri https://hdl.handle.net/20.500.12390/1155
dc.language.iso eng
dc.publisher IOP Publishing
dc.relation.ispartof Journal of Physics D-Applied Physics
dc.rights info:eu-repo/semantics/openAccess
dc.subject Urbach focus
dc.subject Brazilian MRS es_PE
dc.subject silicon carbide es_PE
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.03.00
dc.title The Urbach focus and optical properties of amorphous hydrogenated SiC thin films
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
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