Artículo
Two mechanisms of conduction in polycrystalline SnO2
Malagú, C.; Carotta, M.C.; Giberti, A.; Guidi, V.; Martinelli, G.; Ponce, Miguel Adolfo
; Castro, Miriam Susana
; Aldao, Celso Manuel
Fecha de publicación:
02/2009
Editorial:
Elsevier Science Sa
Revista:
Sensors and Actuators B: Chemical
ISSN:
0925-4005
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Impedance spectroscopy was carried out on SnO2 thick films exposed to different atmospheres. Oxygen desorption and adsorption during heating and cooling processes, respectively, onto the grain surface affects the resistance and electrical capacitance of the sensors. Double parabolic Schottky-type potential barriers at grain boundaries were assumed to analyze the tunneling and thermionic contributions to conductivity. In addition, the influence of the temperature on the oxygen diffusion into the grains annihilating oxygen vacancies was studied. It was deduced that in-diffusion substantially affects the conductivity. © 2008 Elsevier B.V. All rights reserved.
Palabras clave:
Impedance Spectroscopy
,
Metal-Oxide Semiconductors
,
Tunneling
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Identificadores
Colecciones
Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
Malagú, C.; Carotta, M.C.; Giberti, A.; Guidi, V.; Martinelli, G.; et al.; Two mechanisms of conduction in polycrystalline SnO2; Elsevier Science Sa; Sensors and Actuators B: Chemical; 136; 1; 2-2009; 230-234
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