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- Publisher Website: 10.1038/s41598-020-71808-y
- Scopus: eid_2-s2.0-85091192944
- PMID: 32943656
- WOS: WOS:000573758500026
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Article: Temperature-dependent optical constants of monolayer MoS2 , MoSe2 , WS2 , and WSe2 : spectroscopic ellipsometry and first-principles calculations
Title | Temperature-dependent optical constants of monolayer MoS<inf>2</inf>, MoSe<inf>2</inf>, WS<inf>2</inf>, and WSe<inf>2</inf>: spectroscopic ellipsometry and first-principles calculations |
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Authors | |
Issue Date | 2020 |
Citation | Scientific Reports, 2020, v. 10, n. 1, article no. 15282 How to Cite? |
Abstract | The temperature-dependent (T=4.5-500K) optical constants of monolayer MoS , MoSe , WS , and WSe were investigated through spectroscopic ellipsometry over the spectral range of 0.73–6.42 eV. At room temperature, the spectra of refractive index exhibited several anomalous dispersion features below 800 nm and approached a constant value of 3.5–4.0 in the near-infrared frequency range. With a decrease in temperature, the refractive indices decreased monotonically in the near-infrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from 6.1 × 10 to 2.6×10-4K-1 for monolayer transition metal dichalcogenides at a wavelength of 1200 nm below the optical band gap. The optical band gap increased with a decrease in temperature due to the suppression of electron–phonon interactions. On the basis of first-principles calculations, the observed optical excitations at 4.5 K were appropriately assigned. These results provide basic information for the technological development of monolayer transition metal dichalcogenides-based photonic devices at various temperatures. 2 2 2 2 - 5 |
Persistent Identifier | http://hdl.handle.net/10722/297981 |
PubMed Central ID | |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Liu, Hsiang Lin | - |
dc.contributor.author | Yang, Teng | - |
dc.contributor.author | Chen, Jyun Han | - |
dc.contributor.author | Chen, Hsiao Wen | - |
dc.contributor.author | Guo, Huaihong | - |
dc.contributor.author | Saito, Riichiro | - |
dc.contributor.author | Li, Ming Yang | - |
dc.contributor.author | Li, Lain Jong | - |
dc.date.accessioned | 2021-04-08T03:07:24Z | - |
dc.date.available | 2021-04-08T03:07:24Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Scientific Reports, 2020, v. 10, n. 1, article no. 15282 | - |
dc.identifier.uri | http://hdl.handle.net/10722/297981 | - |
dc.description.abstract | The temperature-dependent (T=4.5-500K) optical constants of monolayer MoS , MoSe , WS , and WSe were investigated through spectroscopic ellipsometry over the spectral range of 0.73–6.42 eV. At room temperature, the spectra of refractive index exhibited several anomalous dispersion features below 800 nm and approached a constant value of 3.5–4.0 in the near-infrared frequency range. With a decrease in temperature, the refractive indices decreased monotonically in the near-infrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from 6.1 × 10 to 2.6×10-4K-1 for monolayer transition metal dichalcogenides at a wavelength of 1200 nm below the optical band gap. The optical band gap increased with a decrease in temperature due to the suppression of electron–phonon interactions. On the basis of first-principles calculations, the observed optical excitations at 4.5 K were appropriately assigned. These results provide basic information for the technological development of monolayer transition metal dichalcogenides-based photonic devices at various temperatures. 2 2 2 2 - 5 | - |
dc.language | eng | - |
dc.relation.ispartof | Scientific Reports | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.title | Temperature-dependent optical constants of monolayer MoS<inf>2</inf>, MoSe<inf>2</inf>, WS<inf>2</inf>, and WSe<inf>2</inf>: spectroscopic ellipsometry and first-principles calculations | - |
dc.type | Article | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1038/s41598-020-71808-y | - |
dc.identifier.pmid | 32943656 | - |
dc.identifier.pmcid | PMC7498615 | - |
dc.identifier.scopus | eid_2-s2.0-85091192944 | - |
dc.identifier.volume | 10 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | article no. 15282 | - |
dc.identifier.epage | article no. 15282 | - |
dc.identifier.eissn | 2045-2322 | - |
dc.identifier.isi | WOS:000573758500026 | - |
dc.identifier.issnl | 2045-2322 | - |