Memorias de investigación
Artículos en revistas:
Effects of the impurity-host interactions on the nonradiative processes in ZnS:Cr
Año:2010
Áreas de investigación
  • Química,
  • Química física
Datos
Descripción
There is a great deal of controversy about whether the behavior of an intermediate band in the gap of semiconductors is similar or not to the deep-gap levels. It can have significant consequences, for example, on the nonradiative recombination. In order to analyze the behavior of an intermediate band, we have considered the effect of the inward and outward displacements corresponding to breathing and longitudinal modes of Cr-doped ZnS and on the charge density for different processes involved in the nonradiative recombination using first-principles. This metal-doped zinc chalcogenide has a partially filled band within the host semiconductor gap. In contrast to the properties exhibited by deep-gap levels in other systems, we find small variations in the equilibrium configurations, forces, and electronic density around the Cr when the nonradiative recombination mechanisms modify the intermediate band charge. The charge density around the impurity is equilibrated in response to the perturbations in the equilibrium nuclear configuration and the charge of the intermediate band. The equilibration follows a Le Chatelier principle through the modification of the contribution from the impurity to the intermediate band and to the valence band. The intermediate band introduced by Cr in ZnS for the concentrations analyzed makes the electronic capture difficult and later multiphonon emission in the charge-transfer processes, in accordance with experimental results. (C) 2010 American Institute of Physics. [doi:10.1063/1.3506705]
Internacional
Si
JCR del ISI
Si
Título de la revista
JOURNAL OF APPLIED PHYSICS
ISSN
0021-8979
Factor de impacto JCR
2,072
Información de impacto
Volumen
108
DOI
Número de revista
Desde la página
108-1-1
Hasta la página
108-1-7
Mes
ENERO
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares
  • Centro o Instituto I+D+i: Instituto de Energía Solar