Quantitative Raman spectrum and reliable thickness identification for atomic layers on insulating substrates.
Song-Lin Li,Song-Lin Li,Hisao Miyazaki,Hisao Miyazaki,Haisheng Song,Haisheng Song,Hiromi Kuramochi,Hiromi Kuramochi,Shu Nakaharai,Shu Nakaharai,Kazuhito Tsukagoshi,Kazuhito Tsukagoshi +11 more
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TLDR
In this article, the authors demonstrate the possibility of quantifying the Raman intensities for both specimen and substrate layers in a common stacked experimental configuration and propose a general and rapid thickness identification technique for atomic-scale layers on dielectric substrates.Abstract:
We demonstrate the possibility in quantifying the Raman intensities for both specimen and substrate layers in a common stacked experimental configuration and, consequently, propose a general and rapid thickness identification technique for atomic-scale layers on dielectric substrates. Unprecedentedly wide-range Raman data for atomically flat MoS2 flakes are collected to compare with theoretical models. We reveal that all intensity features can be accurately captured when including optical interference effect. Surprisingly, we find that even freely suspended chalcogenide few-layer flakes have a stronger Raman response than that from the bulk phase. Importantly, despite the oscillating intensity of specimen spectrum versus thickness, the substrate weighted spectral intensity becomes monotonic. Combined with its sensitivity to specimen thickness, we suggest this quantity can be used to rapidly determine the accurate thickness for atomic layers.read more
Citations
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Tunable Photoluminescence of Monolayer MoS2 via Chemical Doping
TL;DR: The tunability of the photoluminescence (PL) properties of monolayer (1L)-MoS2 is demonstrated via chemical doping and enables convenient control of optical and electrical properties of atomically thin MoS2.
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Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
TL;DR: In this article, the basic lattice vibrations of 2D transition metal dichalcogenide (TMD) nanosheets are discussed, including highfrequency optical phonons, interlayer shear and layer breathing phonons.
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Controlled scalable synthesis of uniform, high-quality monolayer and few-layer MoS2 films
TL;DR: This work presents a self-limiting approach that can grow high quality monolayer and few-layer MoS2 films over an area of centimeters with unprecedented uniformity and controllability and paves the way for the development of practical devices with 2DMoS2 and opens up new avenues for fundamental research.
Journal ArticleDOI
Optical properties and band gap of single- and few-layer MoTe2 crystals.
TL;DR: In this paper, a monolayer MoTe2 was shown to be a direct-gap semiconductor with an optical band gap of 1.10 eV, which extends the spectral range from the visible to the near-infrared.
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Dielectric Screening of Excitons and Trions in Single-Layer MoS2
Yuxuan Lin,Xi Ling,Lili Yu,Shengxi Huang,Allen Hsu,Yi-Hsien Lee,Jing Kong,Mildred S. Dresselhaus,Tomas Palacios +8 more
TL;DR: These findings are helpful to better understand the tightly bound exciton properties in strongly quantum-confined systems and provide a simple approach to the selective and separate generation of excitons or trions with potential applications in excitonic interconnects and valleytronics.
References
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TL;DR: This observation shows that quantum confinement in layered d-electron materials like MoS(2), a prototypical metal dichalcogenide, provides new opportunities for engineering the electronic structure of matter at the nanoscale.
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Two-Dimensional Nanosheets Produced by Liquid Exfoliation of Layered Materials
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TL;DR: It is shown that WS2 and MoS2 effectively reinforce polymers, whereas WS2/carbon nanotube hybrid films have high conductivity, leading to promising thermoelectric properties.