Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1516-14392010000400004 http://hdl.handle.net/11449/8497 |
Resumo: | The absorption edge and the bandgap transition of sol-gel-dip-coating SnO2 thin films, deposited on quartz substrates, are evaluated from optical absorption data and temperature dependent photoconductivity spectra. Structural properties of these films help the interpretation of bandgap transition nature, since the obtained nanosized dimensions of crystallites are determinant on dominant growth direction and, thus, absorption energy. Electronic properties of the bulk and (110) and (101) surfaces are also presented, calculated by means of density functional theory applied to periodic calculations at B3LYP hybrid functional level. Experimentally obtained absorption edge is compared to the calculated energy band diagrams of bulk and (110) and (101) surfaces. The overall calculated electronic properties in conjunction with structural and electro-optical experimental data suggest that the nature of the bandgap transition is related to a combined effect of bulk and (101) surface, which presents direct bandgap transition. |
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Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Filmstin dioxidesot-gelthin filmselectronic structureoptical absorptionThe absorption edge and the bandgap transition of sol-gel-dip-coating SnO2 thin films, deposited on quartz substrates, are evaluated from optical absorption data and temperature dependent photoconductivity spectra. Structural properties of these films help the interpretation of bandgap transition nature, since the obtained nanosized dimensions of crystallites are determinant on dominant growth direction and, thus, absorption energy. Electronic properties of the bulk and (110) and (101) surfaces are also presented, calculated by means of density functional theory applied to periodic calculations at B3LYP hybrid functional level. Experimentally obtained absorption edge is compared to the calculated energy band diagrams of bulk and (110) and (101) surfaces. The overall calculated electronic properties in conjunction with structural and electro-optical experimental data suggest that the nature of the bandgap transition is related to a combined effect of bulk and (101) surface, which presents direct bandgap transition.State Univ São Paulo UNESP, Adv Mat Grp, BR-17033360 São Paulo, BrazilState Univ São Paulo UNESP, Defects Semicond & Insulators Grp, BR-17033360 São Paulo, BrazilState Univ São Paulo UNESP, Dept Phys FC, BR-17033360 São Paulo, BrazilState Univ São Paulo UNESP, Modeling & Mol Simulat Grp DM FC, BR-17033360 São Paulo, BrazilFed Univ Minas Gerais UFMG, Lab Nanomat, BR-31270901 Belo Horizonte, MG, BrazilState Univ São Paulo UNESP, Adv Mat Grp, BR-17033360 São Paulo, BrazilState Univ São Paulo UNESP, Defects Semicond & Insulators Grp, BR-17033360 São Paulo, BrazilState Univ São Paulo UNESP, Dept Phys FC, BR-17033360 São Paulo, BrazilState Univ São Paulo UNESP, Modeling & Mol Simulat Grp DM FC, BR-17033360 São Paulo, BrazilUniversidade Federal de São Carlos (UFSCar), Dept Engenharia MaterialsUniversidade Estadual Paulista (Unesp)Universidade Federal de Minas Gerais (UFMG)Floriano, Emerson Aparecido [UNESP]Scalvi, Luis Vicente de Andrade [UNESP]Sambrano, Julio Ricardo [UNESP]Geraldo, Viviany [UNESP]2014-05-20T13:26:22Z2014-05-20T13:26:22Z2010-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article437-443application/pdfhttp://dx.doi.org/10.1590/S1516-14392010000400004Materials Research-ibero-american Journal of Materials. São Carlos: Universidade Federal de São Carlos (UFSCar), Dept Engenharia Materials, v. 13, n. 4, p. 437-443, 2010.1516-1439http://hdl.handle.net/11449/8497S1516-14392010000400004WOS:000287017400003S1516-14392010000400004-en.pdf773071947645123262841685796170660000-0001-5762-6424Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterials Research-ibero-american Journal of Materials1.1030,398info:eu-repo/semantics/openAccess2024-01-17T06:23:59Zoai:repositorio.unesp.br:11449/8497Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-01-17T06:23:59Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films |
title |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films |
spellingShingle |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films Floriano, Emerson Aparecido [UNESP] tin dioxide sot-gel thin films electronic structure optical absorption |
title_short |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films |
title_full |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films |
title_fullStr |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films |
title_full_unstemmed |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films |
title_sort |
Evaluation of Bulk and Surfaces Absorption Edge Energy of Sol-Gel-Dip-Coating SnO2 Thin Films |
author |
Floriano, Emerson Aparecido [UNESP] |
author_facet |
Floriano, Emerson Aparecido [UNESP] Scalvi, Luis Vicente de Andrade [UNESP] Sambrano, Julio Ricardo [UNESP] Geraldo, Viviany [UNESP] |
author_role |
author |
author2 |
Scalvi, Luis Vicente de Andrade [UNESP] Sambrano, Julio Ricardo [UNESP] Geraldo, Viviany [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal de Minas Gerais (UFMG) |
dc.contributor.author.fl_str_mv |
Floriano, Emerson Aparecido [UNESP] Scalvi, Luis Vicente de Andrade [UNESP] Sambrano, Julio Ricardo [UNESP] Geraldo, Viviany [UNESP] |
dc.subject.por.fl_str_mv |
tin dioxide sot-gel thin films electronic structure optical absorption |
topic |
tin dioxide sot-gel thin films electronic structure optical absorption |
description |
The absorption edge and the bandgap transition of sol-gel-dip-coating SnO2 thin films, deposited on quartz substrates, are evaluated from optical absorption data and temperature dependent photoconductivity spectra. Structural properties of these films help the interpretation of bandgap transition nature, since the obtained nanosized dimensions of crystallites are determinant on dominant growth direction and, thus, absorption energy. Electronic properties of the bulk and (110) and (101) surfaces are also presented, calculated by means of density functional theory applied to periodic calculations at B3LYP hybrid functional level. Experimentally obtained absorption edge is compared to the calculated energy band diagrams of bulk and (110) and (101) surfaces. The overall calculated electronic properties in conjunction with structural and electro-optical experimental data suggest that the nature of the bandgap transition is related to a combined effect of bulk and (101) surface, which presents direct bandgap transition. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-10-01 2014-05-20T13:26:22Z 2014-05-20T13:26:22Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S1516-14392010000400004 Materials Research-ibero-american Journal of Materials. São Carlos: Universidade Federal de São Carlos (UFSCar), Dept Engenharia Materials, v. 13, n. 4, p. 437-443, 2010. 1516-1439 http://hdl.handle.net/11449/8497 S1516-14392010000400004 WOS:000287017400003 S1516-14392010000400004-en.pdf 7730719476451232 6284168579617066 0000-0001-5762-6424 |
url |
http://dx.doi.org/10.1590/S1516-14392010000400004 http://hdl.handle.net/11449/8497 |
identifier_str_mv |
Materials Research-ibero-american Journal of Materials. São Carlos: Universidade Federal de São Carlos (UFSCar), Dept Engenharia Materials, v. 13, n. 4, p. 437-443, 2010. 1516-1439 S1516-14392010000400004 WOS:000287017400003 S1516-14392010000400004-en.pdf 7730719476451232 6284168579617066 0000-0001-5762-6424 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Materials Research-ibero-american Journal of Materials 1.103 0,398 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
437-443 application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos (UFSCar), Dept Engenharia Materials |
publisher.none.fl_str_mv |
Universidade Federal de São Carlos (UFSCar), Dept Engenharia Materials |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1792962361855836160 |