High-frequency sheet conductance of nanolayered WS2 crystals for two-dimensional nanodevices
- Author
- Stan E. T. ter Huurne, Adonai Rodrigues Da Cruz, Niels van Hoof, Rasmus H. Godiksen, Sara A. Elrafei, Alberto Curto (UGent) , Michael E. Flatte and Jaime Gomez Rivas
- Organization
- Abstract
- 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 (WS2). 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.
- Keywords
- TOTAL-ENERGY CALCULATIONS, LAYER MOS2, TERAHERTZ, CONDUCTIVITY, DYNAMICS, MODES, SHEAR, MONO, terahertz near-field spectroscopy, terahertz conductivity, electron-phonon coupling, tungsten disulfide, transition metal, dichalcogenide, density functional theory
Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-01GPPY3FX246AHYVXN5WK12C2G
- MLA
- ter Huurne, Stan E. T., et al. “High-Frequency Sheet Conductance of Nanolayered WS2 Crystals for Two-Dimensional Nanodevices.” ACS APPLIED NANO MATERIALS, vol. 5, no. 10, 2022, pp. 15557–62, doi:10.1021/acsanm.2c03517.
- APA
- ter Huurne, S. E. T., Da Cruz, A. R., van Hoof, N., Godiksen, R. H., Elrafei, S. A., Curto, A., … Rivas, J. G. (2022). High-frequency sheet conductance of nanolayered WS2 crystals for two-dimensional nanodevices. ACS APPLIED NANO MATERIALS, 5(10), 15557–15562. https://doi.org/10.1021/acsanm.2c03517
- Chicago author-date
- Huurne, Stan E. T. ter, Adonai Rodrigues Da Cruz, Niels van Hoof, Rasmus H. Godiksen, Sara A. Elrafei, Alberto Curto, Michael E. Flatte, and Jaime Gomez Rivas. 2022. “High-Frequency Sheet Conductance of Nanolayered WS2 Crystals for Two-Dimensional Nanodevices.” ACS APPLIED NANO MATERIALS 5 (10): 15557–62. https://doi.org/10.1021/acsanm.2c03517.
- Chicago author-date (all authors)
- ter Huurne, Stan E. T., Adonai Rodrigues Da Cruz, Niels van Hoof, Rasmus H. Godiksen, Sara A. Elrafei, Alberto Curto, Michael E. Flatte, and Jaime Gomez Rivas. 2022. “High-Frequency Sheet Conductance of Nanolayered WS2 Crystals for Two-Dimensional Nanodevices.” ACS APPLIED NANO MATERIALS 5 (10): 15557–15562. doi:10.1021/acsanm.2c03517.
- Vancouver
- 1.ter Huurne SET, Da Cruz AR, van Hoof N, Godiksen RH, Elrafei SA, Curto A, et al. High-frequency sheet conductance of nanolayered WS2 crystals for two-dimensional nanodevices. ACS APPLIED NANO MATERIALS. 2022;5(10):15557–62.
- IEEE
- [1]S. E. T. ter Huurne et al., “High-frequency sheet conductance of nanolayered WS2 crystals for two-dimensional nanodevices,” ACS APPLIED NANO MATERIALS, vol. 5, no. 10, pp. 15557–15562, 2022.
@article{01GPPY3FX246AHYVXN5WK12C2G,
abstract = {{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 (WS2). 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.}},
author = {{ter Huurne, Stan E. T. and Da Cruz, Adonai Rodrigues and van Hoof, Niels and Godiksen, Rasmus H. and Elrafei, Sara A. and Curto, Alberto and Flatte, Michael E. and Rivas, Jaime Gomez}},
issn = {{2574-0970}},
journal = {{ACS APPLIED NANO MATERIALS}},
keywords = {{TOTAL-ENERGY CALCULATIONS,LAYER MOS2,TERAHERTZ,CONDUCTIVITY,DYNAMICS,MODES,SHEAR,MONO,terahertz near-field spectroscopy,terahertz conductivity,electron-phonon coupling,tungsten disulfide,transition metal,dichalcogenide,density functional theory}},
language = {{eng}},
number = {{10}},
pages = {{15557--15562}},
title = {{High-frequency sheet conductance of nanolayered WS2 crystals for two-dimensional nanodevices}},
url = {{http://doi.org/10.1021/acsanm.2c03517}},
volume = {{5}},
year = {{2022}},
}
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