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MoS2 monolayers on Si and SiO2 nanocone arrays: influences of 3D dielectric material refractive index on 2D MoS2 optical absorption

Title
MoS2 monolayers on Si and SiO2 nanocone arrays: influences of 3D dielectric material refractive index on 2D MoS2 optical absorption
Authors
Kim, EunahCho, Jin-WooTri Khoa NguyenTrang Thi Thu NguyenYoon, SeokhyunChoi, Jun-HyukPark, Yun ChangKim, Sun-KyungKim, Yong SooKim, Dong-Wook
Ewha Authors
윤석현김동욱
SCOPUS Author ID
윤석현scopus; 김동욱scopus
Issue Date
2018
Journal Title
NANOSCALE
ISSN
2040-3364JCR Link

2040-3372JCR Link
Citation
NANOSCALE vol. 10, no. 40, pp. 18920 - 18925
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Heterostructures enable the control of transport and recombination of charge carriers, which are either injected through electrodes, or created by light illumination. Instead of full 2D-material-heterostructures in device applications, using hybrid heterostructures consisting of 2D and 3D materials is an alternative approach to take advantage of the unique physical properties of 2D materials. In addition, 3D dielectric nanostructures exhibit useful optical properties such as broadband omnidirectional antireflection effects and strongly concentrated light near the surface. In this work, the optical properties of 2D MoS2 monolayers conformally coated on 3D Si-based nanocone (NC) arrays are investigated. Numerical calculations show that the absorption in MoS2 monolayers on SiO2 NC is significantly enhanced, compared with that for MoS2 monolayers on Si NC. The weak light confinement in low refractive index SiO2 NC leads to greater absorption in the MoS2 monolayers. The measured photoluminescence and Raman intensities of the MoS2 monolayers on SiO2 NC are much greater than those on Si NC, which supports the calculation results. This work demonstrates that 2D MoS2-3D Si nano-heterostructures are promising candidates for use in high-performance integrated optoelectronic device applications.
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DOI
10.1039/c8nr06597g
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자연과학대학 > 물리학전공 > Journal papers
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