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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...

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Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
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.
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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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