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Título:
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Direct observation of potential barrier formation at grain boundaries of SnO_2 ceramics
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Autores:
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Maestre Varea, David ;
Cremades Rodríguez, Ana Isabel ;
Piqueras de Noriega, Javier
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Tipo de documento:
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texto impreso
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Editorial:
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IOP publishing ltd, 2004-11
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/restrictedAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Tipo = Artículo
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Resumen:
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Remote electron beam induced current (REBIC) and cathodoluminescence (CL) modes in the scanning electron microscope (SEM) have been used to investigate SnO2 sintered samples. The study of the electrically active boundaries present in the oxide shows a characteristic peak and trough (PAT) contrast after thermal treatments in oxygen. Temperature-dependent measurements of the REBIC contrast show the presence of a shallow defect level 60 meV below the conduction band. This level is asigned to oxygen species adsorbed on the defect-rich boundaries. Evolution of REBIC contrast of the grain boundaries with excitation density enabled us to perform local measurements of minority carrier diffusion length.
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En línea:
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https://eprints.ucm.es/id/eprint/23245/1/CremadesAna28.pdf
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