Optical properties of suspended and supported MoS2 monolayers
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFMG |
Texto Completo: | http://hdl.handle.net/1843/31440 |
Resumo: | Transition metal dichalcogenides, like MoS2, have attracted a lot of attention in the last decade, due to the fact that they are layered semiconductors with an energy gap in the near infrared/visible, opening the way to many technological applications and fundamental studies. In this work we investigate the optical properties of MoS2 single layers both suspended and supported on a SiO2/Si substrate. Photoluminescence (PL) and Raman spectra were taken as a function of temperature from 7 K to 300 K in vacuum. We see significant differences in the PL spectra of the suspended and supported samples. In addition to the well-known excitonic features, called A and B in the literature, we observe emission from charged excitons (trions). We show and explain the evolution of these emissions as the temperature changes. At low temperature two new features become more noticeable and we attribute them to bound excitons. |
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Paulo Sérgio Soares Guimarãeshttp://lattes.cnpq.br/5493283201428571Pierre-Louis de AssisLeandro Malard MoreiraGuilherme Almeida Silva Ribeirohttp://lattes.cnpq.br/8687733418939417Anna Carolina Marx Gonçalves2019-12-05T20:20:23Z2019-12-05T20:20:23Z2019-08-13http://hdl.handle.net/1843/31440Transition metal dichalcogenides, like MoS2, have attracted a lot of attention in the last decade, due to the fact that they are layered semiconductors with an energy gap in the near infrared/visible, opening the way to many technological applications and fundamental studies. In this work we investigate the optical properties of MoS2 single layers both suspended and supported on a SiO2/Si substrate. Photoluminescence (PL) and Raman spectra were taken as a function of temperature from 7 K to 300 K in vacuum. We see significant differences in the PL spectra of the suspended and supported samples. In addition to the well-known excitonic features, called A and B in the literature, we observe emission from charged excitons (trions). We show and explain the evolution of these emissions as the temperature changes. At low temperature two new features become more noticeable and we attribute them to bound excitons.Dicalcogenetos de metais de transição, como o MoS2, têm atraído muita atenção na última decada, dado que são semicondutores com um gap de energia no infravermelho/visível, abrindo caminho para muitas aplicações tecnológicas e estudos fundamentais. Nesse trabalho, investigamos as propriedades ópticas de monocamadas de MoS2, tanto suspensas como suportadas em substratos de SiO2/Si. Espectros de fotoluminescência e Raman foram obtidos em função da temperatura, de 7 K a 300 K, em vácuo. Vemos mudanças significativas no espectro de fotoluminescência das amostras suspensas e suportadas. Além das transições excitônicas características, conhecidas como A e B na literatura, observamos também a emissão de éxcitons carregados (tríons). Apresentamos e explicamos a evolução dessas emissões à medida que varia-se a temperatura. Para baixas temperaturas, duas novas emissões se tornam mais evidentes e as atribuímos a éxcitons ligados a impurezas.CNPq - Conselho Nacional de Desenvolvimento Científico e TecnológicoFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas GeraisCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorengUniversidade Federal de Minas GeraisPrograma de Pós-Graduação em FísicaUFMGBrasilICX - DEPARTAMENTO DE FÍSICAPropriedades ópticasSemicondutoresMatéria condensadaTransition Metal DichalcogenidesMonolayerMoS2Optical properties of suspended and supported MoS2 monolayersPropriedades ópticas de monocamadas de MoS2 suspensas e suportadasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGORIGINALDissertação_Anna.pdfDissertação_Anna.pdfOptical properties of suspended and supported MoS2 monolayersapplication/pdf31789909https://repositorio.ufmg.br/bitstream/1843/31440/3/Disserta%c3%a7%c3%a3o_Anna.pdf5345a4c5aef6db8d179b1c53e02d7e7bMD53LICENSElicense.txtlicense.txttext/plain; charset=utf-82119https://repositorio.ufmg.br/bitstream/1843/31440/4/license.txt34badce4be7e31e3adb4575ae96af679MD54TEXTDissertação_Anna.pdf.txtDissertação_Anna.pdf.txtExtracted texttext/plain112175https://repositorio.ufmg.br/bitstream/1843/31440/5/Disserta%c3%a7%c3%a3o_Anna.pdf.txtb68772f10e86a5000801e91babab1b58MD551843/314402019-12-06 03:27:41.2oai:repositorio.ufmg.br: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Repositório de PublicaçõesPUBhttps://repositorio.ufmg.br/oaiopendoar:2019-12-06T06:27:41Repositório Institucional da UFMG - Universidade Federal de Minas Gerais (UFMG)false |
dc.title.pt_BR.fl_str_mv |
Optical properties of suspended and supported MoS2 monolayers |
dc.title.alternative.pt_BR.fl_str_mv |
Propriedades ópticas de monocamadas de MoS2 suspensas e suportadas |
title |
Optical properties of suspended and supported MoS2 monolayers |
spellingShingle |
Optical properties of suspended and supported MoS2 monolayers Anna Carolina Marx Gonçalves Transition Metal Dichalcogenides Monolayer MoS2 Propriedades ópticas Semicondutores Matéria condensada |
title_short |
Optical properties of suspended and supported MoS2 monolayers |
title_full |
Optical properties of suspended and supported MoS2 monolayers |
title_fullStr |
Optical properties of suspended and supported MoS2 monolayers |
title_full_unstemmed |
Optical properties of suspended and supported MoS2 monolayers |
title_sort |
Optical properties of suspended and supported MoS2 monolayers |
author |
Anna Carolina Marx Gonçalves |
author_facet |
Anna Carolina Marx Gonçalves |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Paulo Sérgio Soares Guimarães |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5493283201428571 |
dc.contributor.advisor-co1.fl_str_mv |
Pierre-Louis de Assis |
dc.contributor.referee1.fl_str_mv |
Leandro Malard Moreira |
dc.contributor.referee2.fl_str_mv |
Guilherme Almeida Silva Ribeiro |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/8687733418939417 |
dc.contributor.author.fl_str_mv |
Anna Carolina Marx Gonçalves |
contributor_str_mv |
Paulo Sérgio Soares Guimarães Pierre-Louis de Assis Leandro Malard Moreira Guilherme Almeida Silva Ribeiro |
dc.subject.por.fl_str_mv |
Transition Metal Dichalcogenides Monolayer MoS2 |
topic |
Transition Metal Dichalcogenides Monolayer MoS2 Propriedades ópticas Semicondutores Matéria condensada |
dc.subject.other.pt_BR.fl_str_mv |
Propriedades ópticas Semicondutores Matéria condensada |
description |
Transition metal dichalcogenides, like MoS2, have attracted a lot of attention in the last decade, due to the fact that they are layered semiconductors with an energy gap in the near infrared/visible, opening the way to many technological applications and fundamental studies. In this work we investigate the optical properties of MoS2 single layers both suspended and supported on a SiO2/Si substrate. Photoluminescence (PL) and Raman spectra were taken as a function of temperature from 7 K to 300 K in vacuum. We see significant differences in the PL spectra of the suspended and supported samples. In addition to the well-known excitonic features, called A and B in the literature, we observe emission from charged excitons (trions). We show and explain the evolution of these emissions as the temperature changes. At low temperature two new features become more noticeable and we attribute them to bound excitons. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-12-05T20:20:23Z |
dc.date.available.fl_str_mv |
2019-12-05T20:20:23Z |
dc.date.issued.fl_str_mv |
2019-08-13 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1843/31440 |
url |
http://hdl.handle.net/1843/31440 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Minas Gerais |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Física |
dc.publisher.initials.fl_str_mv |
UFMG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
ICX - DEPARTAMENTO DE FÍSICA |
publisher.none.fl_str_mv |
Universidade Federal de Minas Gerais |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFMG instname:Universidade Federal de Minas Gerais (UFMG) instacron:UFMG |
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Universidade Federal de Minas Gerais (UFMG) |
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UFMG |
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UFMG |
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Repositório Institucional da UFMG |
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Repositório Institucional da UFMG |
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