Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/13429 |
Resumo: | Raman spectroscopy results obtained under visible (non-resonant) and UV (resonant) excitation for nanocrystalline ZnO, ZnO:Mn and ZnO:Mn:Al thin films grown by radio frequency magnetron sputtering are presented and compared. The origin of the multiple longitudinal optical (LO) phonon Raman peaks, strongly enhanced under resonance conditions, and the effects of the dopants on them are discussed in the framework of the ‘cascade’ model. It is suggested that the observed suppression of the higher-order LO phonon lines for ZnO:Mn:Al is caused by the dissociation of excitons in the heavily n-type doped material. On the basis of the cascade model interpretation of the higher-order Raman peaks in the resonant spectra, the LO phonon frequencies for wavevectors away from the gamma point are evaluated and compared topreviously published phonon dispersion curves. |
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Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputteringZnORaman spectroscopyMn and Al dopingPhononsScience & TechnologyRaman spectroscopy results obtained under visible (non-resonant) and UV (resonant) excitation for nanocrystalline ZnO, ZnO:Mn and ZnO:Mn:Al thin films grown by radio frequency magnetron sputtering are presented and compared. The origin of the multiple longitudinal optical (LO) phonon Raman peaks, strongly enhanced under resonance conditions, and the effects of the dopants on them are discussed in the framework of the ‘cascade’ model. It is suggested that the observed suppression of the higher-order LO phonon lines for ZnO:Mn:Al is caused by the dissociation of excitons in the heavily n-type doped material. On the basis of the cascade model interpretation of the higher-order Raman peaks in the resonant spectra, the LO phonon frequencies for wavevectors away from the gamma point are evaluated and compared topreviously published phonon dispersion curves.Financial support from the FCT through project PTDC/FIS/72843/2006 is acknowledged.IOP PublishingUniversidade do MinhoCerqueira, M. F.Vasilevskiy, MikhailOliveira, FernandoRolo, Anabela G.Viseu, T. M. R.Campos, J. Ayres deAlves, E.Correia, Rosário20112011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/13429eng0953-898410.1088/0953-8984/23/33/33420521813947stacks.iop.org/JPhysCM/23/334205info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:49:24Zoai:repositorium.sdum.uminho.pt:1822/13429Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:47:52.859353Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering |
title |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering |
spellingShingle |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering Cerqueira, M. F. ZnO Raman spectroscopy Mn and Al doping Phonons Science & Technology |
title_short |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering |
title_full |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering |
title_fullStr |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering |
title_full_unstemmed |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering |
title_sort |
Resonant raman scattering in ZnO : Mn and ZnO: Mn : Al thin films grown by RF sputtering |
author |
Cerqueira, M. F. |
author_facet |
Cerqueira, M. F. Vasilevskiy, Mikhail Oliveira, Fernando Rolo, Anabela G. Viseu, T. M. R. Campos, J. Ayres de Alves, E. Correia, Rosário |
author_role |
author |
author2 |
Vasilevskiy, Mikhail Oliveira, Fernando Rolo, Anabela G. Viseu, T. M. R. Campos, J. Ayres de Alves, E. Correia, Rosário |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Cerqueira, M. F. Vasilevskiy, Mikhail Oliveira, Fernando Rolo, Anabela G. Viseu, T. M. R. Campos, J. Ayres de Alves, E. Correia, Rosário |
dc.subject.por.fl_str_mv |
ZnO Raman spectroscopy Mn and Al doping Phonons Science & Technology |
topic |
ZnO Raman spectroscopy Mn and Al doping Phonons Science & Technology |
description |
Raman spectroscopy results obtained under visible (non-resonant) and UV (resonant) excitation for nanocrystalline ZnO, ZnO:Mn and ZnO:Mn:Al thin films grown by radio frequency magnetron sputtering are presented and compared. The origin of the multiple longitudinal optical (LO) phonon Raman peaks, strongly enhanced under resonance conditions, and the effects of the dopants on them are discussed in the framework of the ‘cascade’ model. It is suggested that the observed suppression of the higher-order LO phonon lines for ZnO:Mn:Al is caused by the dissociation of excitons in the heavily n-type doped material. On the basis of the cascade model interpretation of the higher-order Raman peaks in the resonant spectra, the LO phonon frequencies for wavevectors away from the gamma point are evaluated and compared topreviously published phonon dispersion curves. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011 2011-01-01T00:00:00Z |
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://hdl.handle.net/1822/13429 |
url |
http://hdl.handle.net/1822/13429 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0953-8984 10.1088/0953-8984/23/33/334205 21813947 stacks.iop.org/JPhysCM/23/334205 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
IOP Publishing |
publisher.none.fl_str_mv |
IOP Publishing |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799133054399152128 |