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Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes
[Image: see text] Excitons dominate the light absorption and re-emission spectra of monolayer transition-metal dichalcogenides (TMD). Microscopic investigations of the excitonic response in TMD almost invariably extract information from the radiative recombination step, which only constitutes one pa...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical
Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8411805/ https://www.ncbi.nlm.nih.gov/pubmed/34484552 http://dx.doi.org/10.1021/acs.jpcc.1c04287 |
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author | Magnozzi, Michele Pflug, Theo Ferrera, Marzia Pace, Simona Ramó, Lorenzo Olbrich, Markus Canepa, Paolo Ağircan, Hasret Horn, Alexander Forti, Stiven Cavalleri, Ornella Coletti, Camilla Bisio, Francesco Canepa, Maurizio |
author_facet | Magnozzi, Michele Pflug, Theo Ferrera, Marzia Pace, Simona Ramó, Lorenzo Olbrich, Markus Canepa, Paolo Ağircan, Hasret Horn, Alexander Forti, Stiven Cavalleri, Ornella Coletti, Camilla Bisio, Francesco Canepa, Maurizio |
author_sort | Magnozzi, Michele |
collection | PubMed |
description | [Image: see text] Excitons dominate the light absorption and re-emission spectra of monolayer transition-metal dichalcogenides (TMD). Microscopic investigations of the excitonic response in TMD almost invariably extract information from the radiative recombination step, which only constitutes one part of the picture. Here, by exploiting imaging spectroscopic ellipsometry (ISE), we investigate the spatial dependence of the dielectric function of chemical vapor deposition (CVD)-grown WS(2) flakes with a microscopic lateral resolution, thus providing information about the spatially varying, exciton-induced light absorption in the monolayer WS(2). Comparing the ISE results with imaging photoluminescence spectroscopy data, the presence of several correlated features was observed, along with the unexpected existence of a few uncorrelated characteristics. The latter demonstrates that the exciton-induced absorption and emission features are not always proportional at the microscopic scale. Microstructural modulations across the flakes, having a different influence on the absorption and re-emission of light, are deemed responsible for the effect. |
format | Online Article Text |
id | pubmed-8411805 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical
Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-84118052021-09-03 Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes Magnozzi, Michele Pflug, Theo Ferrera, Marzia Pace, Simona Ramó, Lorenzo Olbrich, Markus Canepa, Paolo Ağircan, Hasret Horn, Alexander Forti, Stiven Cavalleri, Ornella Coletti, Camilla Bisio, Francesco Canepa, Maurizio J Phys Chem C Nanomater Interfaces [Image: see text] Excitons dominate the light absorption and re-emission spectra of monolayer transition-metal dichalcogenides (TMD). Microscopic investigations of the excitonic response in TMD almost invariably extract information from the radiative recombination step, which only constitutes one part of the picture. Here, by exploiting imaging spectroscopic ellipsometry (ISE), we investigate the spatial dependence of the dielectric function of chemical vapor deposition (CVD)-grown WS(2) flakes with a microscopic lateral resolution, thus providing information about the spatially varying, exciton-induced light absorption in the monolayer WS(2). Comparing the ISE results with imaging photoluminescence spectroscopy data, the presence of several correlated features was observed, along with the unexpected existence of a few uncorrelated characteristics. The latter demonstrates that the exciton-induced absorption and emission features are not always proportional at the microscopic scale. Microstructural modulations across the flakes, having a different influence on the absorption and re-emission of light, are deemed responsible for the effect. American Chemical Society 2021-07-14 2021-07-29 /pmc/articles/PMC8411805/ /pubmed/34484552 http://dx.doi.org/10.1021/acs.jpcc.1c04287 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Magnozzi, Michele Pflug, Theo Ferrera, Marzia Pace, Simona Ramó, Lorenzo Olbrich, Markus Canepa, Paolo Ağircan, Hasret Horn, Alexander Forti, Stiven Cavalleri, Ornella Coletti, Camilla Bisio, Francesco Canepa, Maurizio Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes |
title | Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes |
title_full | Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes |
title_fullStr | Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes |
title_full_unstemmed | Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes |
title_short | Local Optical Properties in CVD-Grown Monolayer WS(2) Flakes |
title_sort | local optical properties in cvd-grown monolayer ws(2) flakes |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8411805/ https://www.ncbi.nlm.nih.gov/pubmed/34484552 http://dx.doi.org/10.1021/acs.jpcc.1c04287 |
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