Temperature-dependent optical constants of monolayer MoS2, MoSe2, WS2, and WSe2: spectroscopic ellipsometry and first-principles calculations

doi:10.1038/s41598-020-71808-y

IMR OpenIR

	Temperature-dependent optical constants of monolayer MoS2, MoSe2, WS2, and WSe2: spectroscopic ellipsometry and first-principles calculations
	Liu, Hsiang-Lin 1; Yang, Teng 2,3; Chen, Jyun-Han 1; Chen, Hsiao-Wen 1; Guo, Huaihong 3,4; Saito, Riichiro 3; Li, Ming-Yang 5,6; Li, Lain-Jong 6
通讯作者	Liu, Hsiang-Lin(hliu@ntnu.edu.tw) ; Yang, Teng(yangteng@imr.ac.cn)
	2020-09-17
发表期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
卷号	10 期号:1 页码:11
摘要	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.
资助者	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
收录类别	SCI
语种	英语
资助项目	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研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000573758500026
出版者	NATURE RESEARCH
引用统计	被引频次：64[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/140714
专题	中国科学院金属研究所
通讯作者	Liu, Hsiang-Lin; Yang, Teng
作者单位	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
推荐引用方式 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.