| Temperature-dependent optical constants of monolayer MoS2, MoSe2, WS2, and WSe2: spectroscopic ellipsometry and first-principles calculations | |
| Liu, Hsiang-Lin1; Yang, Teng2,3; Chen, Jyun-Han1; Chen, Hsiao-Wen1; Guo, Huaihong3,4; Saito, Riichiro3; Li, Ming-Yang5,6; Li, Lain-Jong6 | |
| Corresponding Author | Liu, Hsiang-Lin(hliu@ntnu.edu.tw) ; Yang, Teng(yangteng@imr.ac.cn) |
| 2020-09-17 | |
| Source Publication | SCIENTIFIC REPORTS
 |
| ISSN | 2045-2322 |
| Volume | 10Issue:1Pages:11 |
| Abstract | The temperature-dependent ( T = 4.5 - 500 K) optical constants of monolayer MoS2, MoSe2, WS2, and WSe 2 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 nearinfrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from 6.1 x 10(-5) to 2.6 x 10(-4) K-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. |
| Funding Organization | Ministry of Science and Technology of Republic of China ; National Key R&D Program of China ; Major Program of Aerospace Advanced Manufacturing Technology Research Foundation NSFC ; CASC, China ; Liaoning Province ; MEXT-Japan ; USA AFOSR BRI ; NSFC |
| DOI | 10.1038/s41598-020-71808-y |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Ministry of Science and Technology of Republic of China[108-2112-M-003-013] ; National Key R&D Program of China[2017YFA0206301] ; Major Program of Aerospace Advanced Manufacturing Technology Research Foundation NSFC[U1537204] ; CASC, China[U1537204] ; Liaoning Province[201601325] ; MEXT-Japan[JP18H01810] ; USA AFOSR BRI[FA238615100015] ; NSFC[51702146] |
| WOS Research Area | Science & Technology - Other Topics |
| WOS Subject | Multidisciplinary Sciences |
| WOS ID | WOS:000573758500026 |
| Publisher | NATURE RESEARCH |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/140714 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Liu, Hsiang-Lin; Yang, Teng |
| Affiliation | 1.Natl Taiwan Normal Univ, Dept Phys, Taipei 11677, Taiwan 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan 4.Liaoning Shihua Univ, Coll Sci, Fushun 113001, Peoples R China 5.Acad Sin, Res Ctr Appl Sci, Taipei 10617, Taiwan 6.King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, Thuwal 239556900, Saudi Arabia |
| Recommended Citation GB/T 7714 | Liu, Hsiang-Lin,Yang, Teng,Chen, Jyun-Han,et al. Temperature-dependent optical constants of monolayer MoS2, MoSe2, WS2, and WSe2: spectroscopic ellipsometry and first-principles calculations[J]. SCIENTIFIC REPORTS,2020,10(1):11. |
| APA | Liu, Hsiang-Lin.,Yang, Teng.,Chen, Jyun-Han.,Chen, Hsiao-Wen.,Guo, Huaihong.,...&Li, Lain-Jong.(2020).Temperature-dependent optical constants of monolayer MoS2, MoSe2, WS2, and WSe2: spectroscopic ellipsometry and first-principles calculations.SCIENTIFIC REPORTS,10(1),11. |
| MLA | Liu, Hsiang-Lin,et al."Temperature-dependent optical constants of monolayer MoS2, MoSe2, WS2, and WSe2: spectroscopic ellipsometry and first-principles calculations".SCIENTIFIC REPORTS 10.1(2020):11. |
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