Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-Films

A deep analysis of conductance in nanostructured SnO2 thick films has been performed. A model for field-assisted thermionic barrier crossing is being proposed to explain the film conductivity. The model has been applied to explain the behavior of resistance in vacuum of two sets of nanostructured th...

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Main Authors: C. Malagù, M. C. Carotta, G. Martinelli, M. A. Ponce, M. S. Castro, C. M. Aldao
Format: Article
Language:English
Published: Hindawi Limited 2009-01-01
Series:Journal of Sensors
Online Access:http://dx.doi.org/10.1155/2009/402527
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spelling doaj-3fc945e0fe7c4e82a7bec4e0c1c309312020-11-25T01:00:37ZengHindawi LimitedJournal of Sensors1687-725X1687-72682009-01-01200910.1155/2009/402527402527Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-FilmsC. Malagù0M. C. Carotta1G. Martinelli2M. A. Ponce3M. S. Castro4C. M. Aldao5Department of Physics, University of Ferrara, Via Saragat 1/C, 44100 Ferrara, ItalyDepartment of Physics, University of Ferrara, Via Saragat 1/C, 44100 Ferrara, ItalyDepartment of Physics, University of Ferrara, Via Saragat 1/C, 44100 Ferrara, ItalyInstitute of Materials Science and Technology (INTEMA), National University of Mar del Plata, CONICET, Juan B. Justo 4302, B7608FDQ Mar del Plata, ArgentinaInstitute of Materials Science and Technology (INTEMA), National University of Mar del Plata, CONICET, Juan B. Justo 4302, B7608FDQ Mar del Plata, ArgentinaInstitute of Materials Science and Technology (INTEMA), National University of Mar del Plata, CONICET, Juan B. Justo 4302, B7608FDQ Mar del Plata, ArgentinaA deep analysis of conductance in nanostructured SnO2 thick films has been performed. A model for field-assisted thermionic barrier crossing is being proposed to explain the film conductivity. The model has been applied to explain the behavior of resistance in vacuum of two sets of nanostructured thick-films with grains having two well-distinct characteristic radii (𝑅=25 nm and 𝑅=125 nm). In the first case the grain radius is shorter than the depletion region width, a limit at which overlapping of barriers takes place, and in the second case it is longer. The behavior of resistance in the presence of dry air has been explained through the mechanism of barrier modulation through gas chemisorption.http://dx.doi.org/10.1155/2009/402527
collection DOAJ
language English
format Article
sources DOAJ
author C. Malagù
M. C. Carotta
G. Martinelli
M. A. Ponce
M. S. Castro
C. M. Aldao
spellingShingle C. Malagù
M. C. Carotta
G. Martinelli
M. A. Ponce
M. S. Castro
C. M. Aldao
Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-Films
Journal of Sensors
author_facet C. Malagù
M. C. Carotta
G. Martinelli
M. A. Ponce
M. S. Castro
C. M. Aldao
author_sort C. Malagù
title Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-Films
title_short Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-Films
title_full Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-Films
title_fullStr Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-Films
title_full_unstemmed Field-Assisted and Thermionic Contributions to Conductance in SnO𝟐 Thick-Films
title_sort field-assisted and thermionic contributions to conductance in sno𝟐 thick-films
publisher Hindawi Limited
series Journal of Sensors
issn 1687-725X
1687-7268
publishDate 2009-01-01
description A deep analysis of conductance in nanostructured SnO2 thick films has been performed. A model for field-assisted thermionic barrier crossing is being proposed to explain the film conductivity. The model has been applied to explain the behavior of resistance in vacuum of two sets of nanostructured thick-films with grains having two well-distinct characteristic radii (𝑅=25 nm and 𝑅=125 nm). In the first case the grain radius is shorter than the depletion region width, a limit at which overlapping of barriers takes place, and in the second case it is longer. The behavior of resistance in the presence of dry air has been explained through the mechanism of barrier modulation through gas chemisorption.
url http://dx.doi.org/10.1155/2009/402527
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