Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFMG |
Texto Completo: | http://hdl.handle.net/1843/55856 https://orcid.org/0000-0002-5001-3120 |
Resumo: | The study of two-dimensional semiconductor heterostructures is of great interest for applications such as the implementation of solar cells and various nanoscale devices such as tunnel field effect transistors. Our work aimed to understand how the interaction between different monolayers of transition metal dichalcogenides in vertical heterostructures affects their optical properties. We are particularly interested in how energy and charge exchange processes take place, and in the formation of interlayer excitons. We studied the photoluminescence dependence on temperature and excitation power in addition to Raman spectroscopy and atomic force microscopy, used to characterize the samples. We find evidence of an energy transfer mechanism between excitons of different layers when they are in direct contact, while in layers separated by a thin h-BN layer, we see a charge transfer via tunneling through this h-BN layer. |
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Paulo Sérgio Soares Guimarãeshttp://lattes.cnpq.br/5493283201428571Luiz Gustavo de Oliveira Lopes CançadoMatheus Josué de Souza Matoshttps://lattes.cnpq.br/6538248585921031Túlio Henrique Lopes Gomes de Castro2023-07-06T12:00:34Z2023-07-06T12:00:34Z2023-01-20http://hdl.handle.net/1843/55856https://orcid.org/0000-0002-5001-3120The study of two-dimensional semiconductor heterostructures is of great interest for applications such as the implementation of solar cells and various nanoscale devices such as tunnel field effect transistors. Our work aimed to understand how the interaction between different monolayers of transition metal dichalcogenides in vertical heterostructures affects their optical properties. We are particularly interested in how energy and charge exchange processes take place, and in the formation of interlayer excitons. We studied the photoluminescence dependence on temperature and excitation power in addition to Raman spectroscopy and atomic force microscopy, used to characterize the samples. We find evidence of an energy transfer mechanism between excitons of different layers when they are in direct contact, while in layers separated by a thin h-BN layer, we see a charge transfer via tunneling through this h-BN layer.O estudo de heteroestruturas semicondutoras bidimensionais é de grande interesse para aplicações como a implementação de células solares e vários dispositivos em nanoescala, como transistores de efeito de campo de túnel. Nosso foco neste trabalho foi entender como a interação entre diferentes monocamadas de dicalcogenetos de metais de transição (TMDs) em heteroestruturas verticais afeta suas propriedades ópticas. Estamos particularmente interessados em como ocorrem os processos de troca de energia e carga, e na formação de éxcitons entre-camadas. Estudamos a dependência da fotoluminescência com a temperatura e a potência de excitação além da espectroscopia Raman e microscopia de força atômica, utilizadas para a caracterização das amostras. Encontramos evidências de um mecanismo de transferência de energia entre éxcitons de diferentes camadas quando estão em contato direto, enquanto em camadas separadas por uma fina camada de h-BN vemos uma transferência de carga via tunelamento através dessa camada de h-BN.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 FÍSICAHeteroestruturas semicondutorasTransferência de cargaMetais de transiçãoTMDsHeterostructuresMonolayersMoS2WS2FRETCharge transferOptical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctionsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGLICENSElicense.txtlicense.txttext/plain; charset=utf-82118https://repositorio.ufmg.br/bitstream/1843/55856/4/license.txtcda590c95a0b51b4d15f60c9642ca272MD54ORIGINALDissertação_Túlio.pdfDissertação_Túlio.pdfapplication/pdf52845359https://repositorio.ufmg.br/bitstream/1843/55856/3/Disserta%c3%a7%c3%a3o_T%c3%balio.pdff31b259cfda082e0de2880eb3b5513e5MD531843/558562023-07-06 09:00:35.378oai:repositorio.ufmg.br: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ório de PublicaçõesPUBhttps://repositorio.ufmg.br/oaiopendoar:2023-07-06T12:00:35Repositório Institucional da UFMG - Universidade Federal de Minas Gerais (UFMG)false |
dc.title.pt_BR.fl_str_mv |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions |
title |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions |
spellingShingle |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions Túlio Henrique Lopes Gomes de Castro TMDs Heterostructures Monolayers MoS2 WS2 FRET Charge transfer Heteroestruturas semicondutoras Transferência de carga Metais de transição |
title_short |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions |
title_full |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions |
title_fullStr |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions |
title_full_unstemmed |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions |
title_sort |
Optical properties of transition metal dichalcogenides heterostructures MoS2/WS2 heterojunctions |
author |
Túlio Henrique Lopes Gomes de Castro |
author_facet |
Túlio Henrique Lopes Gomes de Castro |
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.referee1.fl_str_mv |
Luiz Gustavo de Oliveira Lopes Cançado |
dc.contributor.referee2.fl_str_mv |
Matheus Josué de Souza Matos |
dc.contributor.authorLattes.fl_str_mv |
https://lattes.cnpq.br/6538248585921031 |
dc.contributor.author.fl_str_mv |
Túlio Henrique Lopes Gomes de Castro |
contributor_str_mv |
Paulo Sérgio Soares Guimarães Luiz Gustavo de Oliveira Lopes Cançado Matheus Josué de Souza Matos |
dc.subject.por.fl_str_mv |
TMDs Heterostructures Monolayers MoS2 WS2 FRET Charge transfer |
topic |
TMDs Heterostructures Monolayers MoS2 WS2 FRET Charge transfer Heteroestruturas semicondutoras Transferência de carga Metais de transição |
dc.subject.other.pt_BR.fl_str_mv |
Heteroestruturas semicondutoras Transferência de carga Metais de transição |
description |
The study of two-dimensional semiconductor heterostructures is of great interest for applications such as the implementation of solar cells and various nanoscale devices such as tunnel field effect transistors. Our work aimed to understand how the interaction between different monolayers of transition metal dichalcogenides in vertical heterostructures affects their optical properties. We are particularly interested in how energy and charge exchange processes take place, and in the formation of interlayer excitons. We studied the photoluminescence dependence on temperature and excitation power in addition to Raman spectroscopy and atomic force microscopy, used to characterize the samples. We find evidence of an energy transfer mechanism between excitons of different layers when they are in direct contact, while in layers separated by a thin h-BN layer, we see a charge transfer via tunneling through this h-BN layer. |
publishDate |
2023 |
dc.date.accessioned.fl_str_mv |
2023-07-06T12:00:34Z |
dc.date.available.fl_str_mv |
2023-07-06T12:00:34Z |
dc.date.issued.fl_str_mv |
2023-01-20 |
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/1843/55856 |
dc.identifier.orcid.pt_BR.fl_str_mv |
https://orcid.org/0000-0002-5001-3120 |
url |
http://hdl.handle.net/1843/55856 https://orcid.org/0000-0002-5001-3120 |
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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