Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires
- Autores
- Grinblat, Gustavo Sergio; Borrero González, L. J.; Nunes, L. A. O.; Tirado, Monica Cecilia; Comedi, David Mario
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- ZnO/MgO (core/shell) nanowires (NWs) grown by a two-step vapour transport method under different MgO shell growth conditions are examined by x-ray diffraction, photoluminescence (PL) excitation and temperature (10–300 K) dependent PL. The excitonic-to-defect PL ratio is increased by more than two orders of magnitude in the core/shell as compared to bare ZnO NWs. Concomitantly, a strong depression of the PL thermal quenching, most particularly for the visible part of the PL spectrum, occurs. Using a semi-quantitative model, results are interpreted as a strong radiative to non-radiative lifetime ratio reduction due to defect passivation at the ZnO NW walls and photocarrier confinement within the ZnO core by the MgO shell. These beneficial effects are, however, significantly weakened when metal interdiffusion across the core/shell interface is favoured during the shell growth. Non-radiative recombination lifetime in the sample with sharp core/shell interface is described by a single activation energy of 15 meV (bound exciton release). For interdiffused cases and bare ZnO an additional activation energy of 60 meV (free exciton breakup) is observed.
Fil: Grinblat, Gustavo Sergio. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Física. Laboratorio de Física del Solido; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Borrero González, L. J.. Universidade de Sao Paulo; Brasil
Fil: Nunes, L. A. O.. Universidade de Sao Paulo; Brasil
Fil: Tirado, Monica Cecilia. Universidad Nacional de Tucuman. Facultad de Ciencias Exactas y Tecnologia. Departamento de Fisica. Departamento de Nanomateriales y Propiedades Dielectricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Comedi, David Mario. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Física. Laboratorio de Física del Solido; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina - Materia
-
Nanowires
Zno/Mgo
Interdiffusion Across Interfaces
Photoluminescence - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/12482
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Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowiresGrinblat, Gustavo SergioBorrero González, L. J.Nunes, L. A. O.Tirado, Monica CeciliaComedi, David MarioNanowiresZno/MgoInterdiffusion Across InterfacesPhotoluminescencehttps://purl.org/becyt/ford/2.10https://purl.org/becyt/ford/2ZnO/MgO (core/shell) nanowires (NWs) grown by a two-step vapour transport method under different MgO shell growth conditions are examined by x-ray diffraction, photoluminescence (PL) excitation and temperature (10–300 K) dependent PL. The excitonic-to-defect PL ratio is increased by more than two orders of magnitude in the core/shell as compared to bare ZnO NWs. Concomitantly, a strong depression of the PL thermal quenching, most particularly for the visible part of the PL spectrum, occurs. Using a semi-quantitative model, results are interpreted as a strong radiative to non-radiative lifetime ratio reduction due to defect passivation at the ZnO NW walls and photocarrier confinement within the ZnO core by the MgO shell. These beneficial effects are, however, significantly weakened when metal interdiffusion across the core/shell interface is favoured during the shell growth. Non-radiative recombination lifetime in the sample with sharp core/shell interface is described by a single activation energy of 15 meV (bound exciton release). For interdiffused cases and bare ZnO an additional activation energy of 60 meV (free exciton breakup) is observed.Fil: Grinblat, Gustavo Sergio. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Física. Laboratorio de Física del Solido; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Borrero González, L. J.. Universidade de Sao Paulo; BrasilFil: Nunes, L. A. O.. Universidade de Sao Paulo; BrasilFil: Tirado, Monica Cecilia. Universidad Nacional de Tucuman. Facultad de Ciencias Exactas y Tecnologia. Departamento de Fisica. Departamento de Nanomateriales y Propiedades Dielectricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Comedi, David Mario. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Física. Laboratorio de Física del Solido; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaIop Publishing2013-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/12482Grinblat, Gustavo Sergio; Borrero González, L. J.; Nunes, L. A. O.; Tirado, Monica Cecilia; Comedi, David Mario; Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires; Iop Publishing; Nanotechnology; 25; 3; 12-2013; 35705-357130957-4484enginfo:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1088/0957-4484/25/3/035705info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0957-4484/25/3/035705/metainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:34:50Zoai:ri.conicet.gov.ar:11336/12482instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:34:50.285CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires |
title |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires |
spellingShingle |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires Grinblat, Gustavo Sergio Nanowires Zno/Mgo Interdiffusion Across Interfaces Photoluminescence |
title_short |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires |
title_full |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires |
title_fullStr |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires |
title_full_unstemmed |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires |
title_sort |
Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires |
dc.creator.none.fl_str_mv |
Grinblat, Gustavo Sergio Borrero González, L. J. Nunes, L. A. O. Tirado, Monica Cecilia Comedi, David Mario |
author |
Grinblat, Gustavo Sergio |
author_facet |
Grinblat, Gustavo Sergio Borrero González, L. J. Nunes, L. A. O. Tirado, Monica Cecilia Comedi, David Mario |
author_role |
author |
author2 |
Borrero González, L. J. Nunes, L. A. O. Tirado, Monica Cecilia Comedi, David Mario |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Nanowires Zno/Mgo Interdiffusion Across Interfaces Photoluminescence |
topic |
Nanowires Zno/Mgo Interdiffusion Across Interfaces Photoluminescence |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/2.10 https://purl.org/becyt/ford/2 |
dc.description.none.fl_txt_mv |
ZnO/MgO (core/shell) nanowires (NWs) grown by a two-step vapour transport method under different MgO shell growth conditions are examined by x-ray diffraction, photoluminescence (PL) excitation and temperature (10–300 K) dependent PL. The excitonic-to-defect PL ratio is increased by more than two orders of magnitude in the core/shell as compared to bare ZnO NWs. Concomitantly, a strong depression of the PL thermal quenching, most particularly for the visible part of the PL spectrum, occurs. Using a semi-quantitative model, results are interpreted as a strong radiative to non-radiative lifetime ratio reduction due to defect passivation at the ZnO NW walls and photocarrier confinement within the ZnO core by the MgO shell. These beneficial effects are, however, significantly weakened when metal interdiffusion across the core/shell interface is favoured during the shell growth. Non-radiative recombination lifetime in the sample with sharp core/shell interface is described by a single activation energy of 15 meV (bound exciton release). For interdiffused cases and bare ZnO an additional activation energy of 60 meV (free exciton breakup) is observed. Fil: Grinblat, Gustavo Sergio. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Física. Laboratorio de Física del Solido; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Borrero González, L. J.. Universidade de Sao Paulo; Brasil Fil: Nunes, L. A. O.. Universidade de Sao Paulo; Brasil Fil: Tirado, Monica Cecilia. Universidad Nacional de Tucuman. Facultad de Ciencias Exactas y Tecnologia. Departamento de Fisica. Departamento de Nanomateriales y Propiedades Dielectricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Comedi, David Mario. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Física. Laboratorio de Física del Solido; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina |
description |
ZnO/MgO (core/shell) nanowires (NWs) grown by a two-step vapour transport method under different MgO shell growth conditions are examined by x-ray diffraction, photoluminescence (PL) excitation and temperature (10–300 K) dependent PL. The excitonic-to-defect PL ratio is increased by more than two orders of magnitude in the core/shell as compared to bare ZnO NWs. Concomitantly, a strong depression of the PL thermal quenching, most particularly for the visible part of the PL spectrum, occurs. Using a semi-quantitative model, results are interpreted as a strong radiative to non-radiative lifetime ratio reduction due to defect passivation at the ZnO NW walls and photocarrier confinement within the ZnO core by the MgO shell. These beneficial effects are, however, significantly weakened when metal interdiffusion across the core/shell interface is favoured during the shell growth. Non-radiative recombination lifetime in the sample with sharp core/shell interface is described by a single activation energy of 15 meV (bound exciton release). For interdiffused cases and bare ZnO an additional activation energy of 60 meV (free exciton breakup) is observed. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-12 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/12482 Grinblat, Gustavo Sergio; Borrero González, L. J.; Nunes, L. A. O.; Tirado, Monica Cecilia; Comedi, David Mario; Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires; Iop Publishing; Nanotechnology; 25; 3; 12-2013; 35705-35713 0957-4484 |
url |
http://hdl.handle.net/11336/12482 |
identifier_str_mv |
Grinblat, Gustavo Sergio; Borrero González, L. J.; Nunes, L. A. O.; Tirado, Monica Cecilia; Comedi, David Mario; Enhanced optical properties and (Zn, Mg) interdiffusion in vapour transport grown ZnO/MgO core/shell nanowires; Iop Publishing; Nanotechnology; 25; 3; 12-2013; 35705-35713 0957-4484 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1088/0957-4484/25/3/035705 info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0957-4484/25/3/035705/meta |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Iop Publishing |
publisher.none.fl_str_mv |
Iop Publishing |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613080546279424 |
score |
13.070432 |