Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion
Conduction mechanisms in polycrystalline SnO2 thick sensing films were investigated by means of DC electrical resistance during heating-cooling cycles. Samples were maintained at relatively high temperatures in H2 or O2 ambient atmospheres before performing electrical measurements under vacuum or be...
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v193_n_p428_Aldao http://hdl.handle.net/20.500.12110/paper_09254005_v193_n_p428_Aldao |
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paper:paper_09254005_v193_n_p428_Aldao2023-06-08T15:51:17Z Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion Williams, Federico Jose Electron tunneling Oxygen diffusion SnO2 Conduction Mechanism Electrical measurement Electrical response Electron transport Heating-cooling cycle Oxygen diffusion SnO<sub>2</sub> Tunneling transports Electron tunneling Schottky barrier diodes Thick films Diffusion in gases Conduction mechanisms in polycrystalline SnO2 thick sensing films were investigated by means of DC electrical resistance during heating-cooling cycles. Samples were maintained at relatively high temperatures in H2 or O2 ambient atmospheres before performing electrical measurements under vacuum or before performing XPS measurements in order to determine band bending. Results suggest that intergrains present Schottky barriers that are responsible for the observed conductivities regardless of gas pre-treatment. Oxygen diffusion modulates barrier widths affecting conductivity through tunneling transport. The electrical response to subsequent exposure to an oxygen atmosphere is consistent with our interpretation. © 2013 Elsevier B.V. All rights reserved. Fil:Williams, F.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v193_n_p428_Aldao http://hdl.handle.net/20.500.12110/paper_09254005_v193_n_p428_Aldao |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Electron tunneling Oxygen diffusion SnO2 Conduction Mechanism Electrical measurement Electrical response Electron transport Heating-cooling cycle Oxygen diffusion SnO<sub>2</sub> Tunneling transports Electron tunneling Schottky barrier diodes Thick films Diffusion in gases |
spellingShingle |
Electron tunneling Oxygen diffusion SnO2 Conduction Mechanism Electrical measurement Electrical response Electron transport Heating-cooling cycle Oxygen diffusion SnO<sub>2</sub> Tunneling transports Electron tunneling Schottky barrier diodes Thick films Diffusion in gases Williams, Federico Jose Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion |
topic_facet |
Electron tunneling Oxygen diffusion SnO2 Conduction Mechanism Electrical measurement Electrical response Electron transport Heating-cooling cycle Oxygen diffusion SnO<sub>2</sub> Tunneling transports Electron tunneling Schottky barrier diodes Thick films Diffusion in gases |
description |
Conduction mechanisms in polycrystalline SnO2 thick sensing films were investigated by means of DC electrical resistance during heating-cooling cycles. Samples were maintained at relatively high temperatures in H2 or O2 ambient atmospheres before performing electrical measurements under vacuum or before performing XPS measurements in order to determine band bending. Results suggest that intergrains present Schottky barriers that are responsible for the observed conductivities regardless of gas pre-treatment. Oxygen diffusion modulates barrier widths affecting conductivity through tunneling transport. The electrical response to subsequent exposure to an oxygen atmosphere is consistent with our interpretation. © 2013 Elsevier B.V. All rights reserved. |
author |
Williams, Federico Jose |
author_facet |
Williams, Federico Jose |
author_sort |
Williams, Federico Jose |
title |
Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion |
title_short |
Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion |
title_full |
Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion |
title_fullStr |
Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion |
title_full_unstemmed |
Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion |
title_sort |
conductivity in sno2 polycrystalline thick film gas sensors: tunneling electron transport and oxygen diffusion |
publishDate |
2014 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v193_n_p428_Aldao http://hdl.handle.net/20.500.12110/paper_09254005_v193_n_p428_Aldao |
work_keys_str_mv |
AT williamsfedericojose conductivityinsno2polycrystallinethickfilmgassensorstunnelingelectrontransportandoxygendiffusion |
_version_ |
1768544232503508992 |