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: | http://hdl.handle.net/20.500.12110/paper_09254005_v193_n_p428_Aldao |
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todo:paper_09254005_v193_n_p428_Aldao2023-10-03T15:46:14Z Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion Aldao, C.M. Schipani, F. Ponce, M.A. Joanni, E. Williams, F.J. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09254005_v193_n_p428_Aldao |
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Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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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 Aldao, C.M. Schipani, F. Ponce, M.A. Joanni, E. Williams, F.J. 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. |
| format |
JOUR |
| author |
Aldao, C.M. Schipani, F. Ponce, M.A. Joanni, E. Williams, F.J. |
| author_facet |
Aldao, C.M. Schipani, F. Ponce, M.A. Joanni, E. Williams, F.J. |
| author_sort |
Aldao, C.M. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_09254005_v193_n_p428_Aldao |
| work_keys_str_mv |
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1807322832563077120 |