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High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices

[Image: see text] Time-resolved terahertz (THz) spectroscopy is a powerful technique for the determination of charge transport properties in photoexcited semiconductors. However, the relatively long wavelengths of THz radiation and the diffraction limit imposed by optical imaging systems reduce the...

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Autores principales: ter Huurne, Stan E.T., Da Cruz, Adonai Rodrigues, van Hoof, Niels, Godiksen, Rasmus H., Elrafei, Sara A., Curto, Alberto G., Flatté, Michael E., Rivas, Jaime Gómez
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9623546/
https://www.ncbi.nlm.nih.gov/pubmed/36338326
http://dx.doi.org/10.1021/acsanm.2c03517
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author ter Huurne, Stan E.T.
Da Cruz, Adonai Rodrigues
van Hoof, Niels
Godiksen, Rasmus H.
Elrafei, Sara A.
Curto, Alberto G.
Flatté, Michael E.
Rivas, Jaime Gómez
author_facet ter Huurne, Stan E.T.
Da Cruz, Adonai Rodrigues
van Hoof, Niels
Godiksen, Rasmus H.
Elrafei, Sara A.
Curto, Alberto G.
Flatté, Michael E.
Rivas, Jaime Gómez
author_sort ter Huurne, Stan E.T.
collection PubMed
description [Image: see text] Time-resolved terahertz (THz) spectroscopy is a powerful technique for the determination of charge transport properties in photoexcited semiconductors. However, the relatively long wavelengths of THz radiation and the diffraction limit imposed by optical imaging systems reduce the applicability of THz spectroscopy to large samples with dimensions in the millimeter to centimeter range. Exploiting THz near-field spectroscopy, we present the first time-resolved THz measurements on a single exfoliated 2D nanolayered crystal of a transition metal dichalcogenide (WS(2)). The high spatial resolution of THz near-field spectroscopy enables mapping of the sheet conductance for an increasing number of atomic layers. The single-crystalline structure of the nanolayered crystal allows for the direct observation of low-energy phonon modes, which are present in all thicknesses, coupling with free carriers. Density functional theory calculations show that the phonon mode corresponds to the breathing mode between atomic layers in the weakly bonded van der Waals layers, which can be strongly influenced by substrate-induced strain. The non-invasive and high-resolution mapping technique of carrier dynamics in nanolayered crystals by time-resolved THz time domain spectroscopy enables possibilities for the investigation of the relation between phonons and charge transport in nanoscale semiconductors for applications in two-dimensional nanodevices.
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spelling pubmed-96235462022-11-02 High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices ter Huurne, Stan E.T. Da Cruz, Adonai Rodrigues van Hoof, Niels Godiksen, Rasmus H. Elrafei, Sara A. Curto, Alberto G. Flatté, Michael E. Rivas, Jaime Gómez ACS Appl Nano Mater [Image: see text] Time-resolved terahertz (THz) spectroscopy is a powerful technique for the determination of charge transport properties in photoexcited semiconductors. However, the relatively long wavelengths of THz radiation and the diffraction limit imposed by optical imaging systems reduce the applicability of THz spectroscopy to large samples with dimensions in the millimeter to centimeter range. Exploiting THz near-field spectroscopy, we present the first time-resolved THz measurements on a single exfoliated 2D nanolayered crystal of a transition metal dichalcogenide (WS(2)). The high spatial resolution of THz near-field spectroscopy enables mapping of the sheet conductance for an increasing number of atomic layers. The single-crystalline structure of the nanolayered crystal allows for the direct observation of low-energy phonon modes, which are present in all thicknesses, coupling with free carriers. Density functional theory calculations show that the phonon mode corresponds to the breathing mode between atomic layers in the weakly bonded van der Waals layers, which can be strongly influenced by substrate-induced strain. The non-invasive and high-resolution mapping technique of carrier dynamics in nanolayered crystals by time-resolved THz time domain spectroscopy enables possibilities for the investigation of the relation between phonons and charge transport in nanoscale semiconductors for applications in two-dimensional nanodevices. American Chemical Society 2022-10-13 2022-10-28 /pmc/articles/PMC9623546/ /pubmed/36338326 http://dx.doi.org/10.1021/acsanm.2c03517 Text en © 2022 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 ter Huurne, Stan E.T.
Da Cruz, Adonai Rodrigues
van Hoof, Niels
Godiksen, Rasmus H.
Elrafei, Sara A.
Curto, Alberto G.
Flatté, Michael E.
Rivas, Jaime Gómez
High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices
title High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices
title_full High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices
title_fullStr High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices
title_full_unstemmed High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices
title_short High-Frequency Sheet Conductance of Nanolayered WS(2) Crystals for Two-Dimensional Nanodevices
title_sort high-frequency sheet conductance of nanolayered ws(2) crystals for two-dimensional nanodevices
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9623546/
https://www.ncbi.nlm.nih.gov/pubmed/36338326
http://dx.doi.org/10.1021/acsanm.2c03517
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