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Layer-dependent dielectric and optical properties of centimeter-scale 2D WSe2: evolution from a single layer to few layers
Gu, Honggang1; Song, Baokun1; Fang, Mingsheng1; Hong, Yilun2; Chen, Xiuguo1; Jiang, Hao1; Ren, Wencai2; Liu, Shiyuan1
Corresponding AuthorRen, Wencai(wcren@imr.ac.cn) ; Liu, Shiyuan(shyliu@hust.edu.cn)
2019-12-21
Source PublicationNANOSCALE
ISSN2040-3364
Volume11Issue:47Pages:22762-22771
AbstractTwo-dimensional (2D) materials usually exhibit interesting layer-dependent dielectric and optical properties, which play important roles in structure optimization and performance improvement of related devices. Recently, 2D WSe2 has attracted considerable attention in atomically thin electronics and optoelectronics, due to its exotic photoelectric properties. In this paper, high-quality, continuous, and centimeter-scale 2D WSe2 with different layers on a sapphire substrate are prepared by an ultrafast ambientpressure chemical vapor deposition method. We comprehensively investigate the evolution of the layerdependent dielectric and optical properties of 2D WSe2 from a single layer to five layers by spectroscopic ellipsometry over an ultra-broad energy range (0.73-6.42 eV). We identify the critical points (CPs) in the dielectric function spectra of 2D WSe2 with different layers, and reveal physical origins of the corresponding optical transitions at these CPs by the CP analysis method and first-principles calculations. Results demonstrate that the center energies of these CPs exhibit intriguing layer-dependencies, which can be interpreted as the alternative domination of the decreasing exciton binding energy and the striking band renormalization. For the first time, we found that the imaginary part of the dielectric function of WSe2 at these CPs exhibits a valley-like shape versus the layer number, and the bottom appears at 3-layers. This non-monotonic evolution is explained as a competition between the layer-dependent decrease of the exciton effect and the layer-dependent increase of the joint density of states.
Funding OrganizationNational Natural Science Foundation of China ; China Postdoctoral Science Foundation ; National Science and Technology Major Project of China ; National Science Foundation of Hubei Province of China ; Experiment Center for Advanced Manufacturing and Technology in School of Mechanical Science & Engineering of HUST
DOI10.1039/c9nr04270a
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51727809] ; National Natural Science Foundation of China[51525502] ; National Natural Science Foundation of China[51805193] ; National Natural Science Foundation of China[51775217] ; China Postdoctoral Science Foundation[2016M602288] ; China Postdoctoral Science Foundation[2017T100546] ; National Science and Technology Major Project of China[2017ZX02101006-004] ; National Science Foundation of Hubei Province of China[2018CFB559] ; National Science Foundation of Hubei Province of China[2018CFA057] ; Experiment Center for Advanced Manufacturing and Technology in School of Mechanical Science & Engineering of HUST
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
WOS SubjectChemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
WOS IDWOS:000506887500040
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136708
Collection中国科学院金属研究所
Corresponding AuthorRen, Wencai; Liu, Shiyuan
Affiliation1.Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Wuhan 430074, Hubei, Peoples R China
2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Gu, Honggang,Song, Baokun,Fang, Mingsheng,et al. Layer-dependent dielectric and optical properties of centimeter-scale 2D WSe2: evolution from a single layer to few layers[J]. NANOSCALE,2019,11(47):22762-22771.
APA Gu, Honggang.,Song, Baokun.,Fang, Mingsheng.,Hong, Yilun.,Chen, Xiuguo.,...&Liu, Shiyuan.(2019).Layer-dependent dielectric and optical properties of centimeter-scale 2D WSe2: evolution from a single layer to few layers.NANOSCALE,11(47),22762-22771.
MLA Gu, Honggang,et al."Layer-dependent dielectric and optical properties of centimeter-scale 2D WSe2: evolution from a single layer to few layers".NANOSCALE 11.47(2019):22762-22771.
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