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Temperature-dependent optical constants of monolayer MoS2, MoSe2, WS2, and WSe2: spectroscopic ellipsometry and first-principles calculations
Liu, Hsiang-Lin; Yang, Teng; Chen, Jyun-Han; Chen, Hsiao-Wen; Guo, Huaihong; Saito, Riichiro; Li, Ming-Yang; Li, Lain-Jong
2020-09-17
Source PublicationSCIENTIFIC REPORTS
Volume10Issue:1
AbstractThe 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.
DOI10.1038/s41598-020-71808-y
WOS IDWOS:000573758500026
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82522
Collection中国科学院金属研究所
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).
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).
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).
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