Enhancing and quantifying spatial homogeneity in monolayer WS2

Abstract Controlling the radiative properties of monolayer transition metal dichalcogenides is key to the development of atomically thin optoelectronic devices applicable to a wide range of industries. A common problem for exfoliated materials is the inherent disorder causing spatially varying nonra...

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Autores principales:	Yameng Cao, Sebastian Wood, Filipe Richheimer, J. Blakesley, Robert J. Young, Fernando A. Castro
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/83f7bb271d684648ad1455d1f94befe9
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spelling	oai:doaj.org-article:83f7bb271d684648ad1455d1f94befe92021-12-02T16:17:17ZEnhancing and quantifying spatial homogeneity in monolayer WS210.1038/s41598-021-94263-92045-2322https://doaj.org/article/83f7bb271d684648ad1455d1f94befe92021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94263-9https://doaj.org/toc/2045-2322Abstract Controlling the radiative properties of monolayer transition metal dichalcogenides is key to the development of atomically thin optoelectronic devices applicable to a wide range of industries. A common problem for exfoliated materials is the inherent disorder causing spatially varying nonradiative losses and therefore inhomogeneity. Here we demonstrate a five-fold reduction in the spatial inhomogeneity in monolayer WS2, resulting in enhanced overall photoluminescence emission and quality of WS2 flakes, by using an ambient-compatible laser illumination process. We propose a method to quantify spatial uniformity using statistics of spectral photoluminescence mapping. Analysis of the dynamic spectral changes shows that the enhancement is due to a spatially sensitive reduction of the charged exciton spectral weighting. The methods presented here are based on widely adopted instrumentation. They can be easily automated, making them ideal candidates for quality assessment of transition metal dichalcogenide materials, both in the laboratory and industrial environments.Yameng CaoSebastian WoodFilipe RichheimerJ. BlakesleyRobert J. YoungFernando A. CastroNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yameng Cao Sebastian Wood Filipe Richheimer J. Blakesley Robert J. Young Fernando A. Castro Enhancing and quantifying spatial homogeneity in monolayer WS2
description	Abstract Controlling the radiative properties of monolayer transition metal dichalcogenides is key to the development of atomically thin optoelectronic devices applicable to a wide range of industries. A common problem for exfoliated materials is the inherent disorder causing spatially varying nonradiative losses and therefore inhomogeneity. Here we demonstrate a five-fold reduction in the spatial inhomogeneity in monolayer WS2, resulting in enhanced overall photoluminescence emission and quality of WS2 flakes, by using an ambient-compatible laser illumination process. We propose a method to quantify spatial uniformity using statistics of spectral photoluminescence mapping. Analysis of the dynamic spectral changes shows that the enhancement is due to a spatially sensitive reduction of the charged exciton spectral weighting. The methods presented here are based on widely adopted instrumentation. They can be easily automated, making them ideal candidates for quality assessment of transition metal dichalcogenide materials, both in the laboratory and industrial environments.
format	article
author	Yameng Cao Sebastian Wood Filipe Richheimer J. Blakesley Robert J. Young Fernando A. Castro
author_facet	Yameng Cao Sebastian Wood Filipe Richheimer J. Blakesley Robert J. Young Fernando A. Castro
author_sort	Yameng Cao
title	Enhancing and quantifying spatial homogeneity in monolayer WS2
title_short	Enhancing and quantifying spatial homogeneity in monolayer WS2
title_full	Enhancing and quantifying spatial homogeneity in monolayer WS2
title_fullStr	Enhancing and quantifying spatial homogeneity in monolayer WS2
title_full_unstemmed	Enhancing and quantifying spatial homogeneity in monolayer WS2
title_sort	enhancing and quantifying spatial homogeneity in monolayer ws2
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/83f7bb271d684648ad1455d1f94befe9
work_keys_str_mv	AT yamengcao enhancingandquantifyingspatialhomogeneityinmonolayerws2 AT sebastianwood enhancingandquantifyingspatialhomogeneityinmonolayerws2 AT filiperichheimer enhancingandquantifyingspatialhomogeneityinmonolayerws2 AT jblakesley enhancingandquantifyingspatialhomogeneityinmonolayerws2 AT robertjyoung enhancingandquantifyingspatialhomogeneityinmonolayerws2 AT fernandoacastro enhancingandquantifyingspatialhomogeneityinmonolayerws2
_version_	1718384240680239104

Enhancing and quantifying spatial homogeneity in monolayer WS2

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