Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

Changes in the concentration of oxygen vacancies within the grains of polycrystalline SnO2, due to different atmosphere exposures, were detected using impedance and photoemission spectroscopies. From measured capacitance values, variations of the potential barrier widths could be determined. It is s...

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Autor principal:	Williams, Federico Jose
Publicado:	2014
Materias:	Capacitance Freons Gas sensing electrodes Oxygen Photoelectron spectroscopy Temperature Textures Thick films Atmosphere exposure Barrier heights Capacitance values Low temperatures Oxygen-rich atmospheres Potential barriers Reducing environment Ultraviolet photoemission spectroscopy Oxygen vacancies
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v116_n19_p_Schipani http://hdl.handle.net/20.500.12110/paper_00218979_v116_n19_p_Schipani
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00218979_v116_n19_p_Schipani
record_format	dspace
spelling	paper:paper_00218979_v116_n19_p_Schipani2023-06-08T14:42:51Z Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies Williams, Federico Jose Capacitance Freons Gas sensing electrodes Oxygen Photoelectron spectroscopy Temperature Textures Thick films Atmosphere exposure Barrier heights Capacitance values Low temperatures Oxygen-rich atmospheres Potential barriers Reducing environment Ultraviolet photoemission spectroscopy Oxygen vacancies Changes in the concentration of oxygen vacancies within the grains of polycrystalline SnO2, due to different atmosphere exposures, were detected using impedance and photoemission spectroscopies. From measured capacitance values, variations of the potential barrier widths could be determined. It is shown that under the presence of an oxygen rich atmosphere, at relatively low temperature, the width of intergranular potential barriers increase to the point that grains become completely depleted of carriers. With subsequent exposure to vacuum, capacitance adopts a higher value, indicative of intergranular barriers and quasi-neutral regions at the center of the grains. X-ray and ultraviolet photoemission spectroscopy measurements showed that SnO2 samples treated in oxidizing or reducing environments have similar barrier heights and different work functions. Results are especially relevant in the study of mechanisms responsible for metal oxide gas sensing. © 2014 AIP Publishing LLC. 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_00218979_v116_n19_p_Schipani http://hdl.handle.net/20.500.12110/paper_00218979_v116_n19_p_Schipani
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Capacitance Freons Gas sensing electrodes Oxygen Photoelectron spectroscopy Temperature Textures Thick films Atmosphere exposure Barrier heights Capacitance values Low temperatures Oxygen-rich atmospheres Potential barriers Reducing environment Ultraviolet photoemission spectroscopy Oxygen vacancies
spellingShingle	Capacitance Freons Gas sensing electrodes Oxygen Photoelectron spectroscopy Temperature Textures Thick films Atmosphere exposure Barrier heights Capacitance values Low temperatures Oxygen-rich atmospheres Potential barriers Reducing environment Ultraviolet photoemission spectroscopy Oxygen vacancies Williams, Federico Jose Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies
topic_facet	Capacitance Freons Gas sensing electrodes Oxygen Photoelectron spectroscopy Temperature Textures Thick films Atmosphere exposure Barrier heights Capacitance values Low temperatures Oxygen-rich atmospheres Potential barriers Reducing environment Ultraviolet photoemission spectroscopy Oxygen vacancies
description	Changes in the concentration of oxygen vacancies within the grains of polycrystalline SnO2, due to different atmosphere exposures, were detected using impedance and photoemission spectroscopies. From measured capacitance values, variations of the potential barrier widths could be determined. It is shown that under the presence of an oxygen rich atmosphere, at relatively low temperature, the width of intergranular potential barriers increase to the point that grains become completely depleted of carriers. With subsequent exposure to vacuum, capacitance adopts a higher value, indicative of intergranular barriers and quasi-neutral regions at the center of the grains. X-ray and ultraviolet photoemission spectroscopy measurements showed that SnO2 samples treated in oxidizing or reducing environments have similar barrier heights and different work functions. Results are especially relevant in the study of mechanisms responsible for metal oxide gas sensing. © 2014 AIP Publishing LLC.
author	Williams, Federico Jose
author_facet	Williams, Federico Jose
author_sort	Williams, Federico Jose
title	Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies
title_short	Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies
title_full	Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies
title_fullStr	Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies
title_full_unstemmed	Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies
title_sort	study of the oxygen vacancies changes in sno2 polycrystalline thick films using impedance and photoemission spectroscopies
publishDate	2014
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v116_n19_p_Schipani http://hdl.handle.net/20.500.12110/paper_00218979_v116_n19_p_Schipani
work_keys_str_mv	AT williamsfedericojose studyoftheoxygenvacancieschangesinsno2polycrystallinethickfilmsusingimpedanceandphotoemissionspectroscopies
_version_	1768545863559282688

Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

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