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http://hdl.handle.net/1843/65073| Tipo: | Artigo de Periódico |
| Título: | Investigation of spatially localized defects in synthetic WS2 monolayers |
| Autor(es): | Bárbara Luiza Teixeira Rosa Bruno Ricardo de Carvalho Helio Chacham Bernardo Ruegger Almeida Neves Mauricio Terrones Leandro Malard Moreira Kazunori Fujisawa Joyce Cristina da Cruz Santos Tianyi Zhang Matheus Josué de Souza Matos Frederico Barros de Sousa Tiago Campolina Barbosa Lucas Lafetá Prates da Fonseca Sergio Luís Lima de Moraes Ramos |
| Resumo: | While the spatially nonhomogeneous light emission from synthetic WS2 monolayers is frequently reported in the literature, the nature of this phenomenon still requires thoughtful investigation. Here, we combine several characterization techniques (optical imaging, scanning probe and electron microscopy) along with density functional theory to investigate the presence of substitutional doping localized at narrow regions along the S zigzag edge of WS2 monolayers. We verified that photoluminescence quenching along narrow regions is not related to grain boundaries but to substitutional impurities of lighter metals at the W sites, which modify the radiative and nonradiative decay channels. We also found potential candidates for occupying the W site through ADF-STEM analysis and discussed their impact on photoluminescence quenching by performing density functional theory calculations. Our findings shed light on how atomic defects introduced during WS2 monolayer's synthesis impact the crystalline quality and, therefore, the development of high-performance optoelectronic devices based on semiconducting 2D materials. |
| Assunto: | Luminescência Nanotecnologia Microscopia de força atômica |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Instituição: | UFMG |
| Departamento: | ICX - DEPARTAMENTO DE FÍSICA |
| Tipo de Acesso: | Acesso Restrito |
| Identificador DOI: | https://doi.org/10.1103/physrevb.106.115301 |
| URI: | http://hdl.handle.net/1843/65073 |
| Data do documento: | 2022 |
| metadata.dc.url.externa: | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.106.115301 |
| metadata.dc.relation.ispartof: | Physical Review B |
| Aparece nas coleções: | Artigo de Periódico |
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