Atomically thin MoS2: a new direct-gap semiconductor
TLDR
The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy and the effect of quantum confinement on the material's electronic structure is traced.Abstract:
The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy Through characterization by absorption, photoluminescence, and photoconductivity spectroscopy, we trace the effect of quantum confinement on the material's electronic structure With decreasing thickness, the indirect band gap, which lies below the direct gap in the bulk material, shifts upwards in energy by more than 06 eV This leads to a crossover to a direct-gap material in the limit of the single monolayer Unlike the bulk material, the MoS₂ monolayer emits light strongly The freestanding monolayer exhibits an increase in luminescence quantum efficiency by more than a factor of 10⁴ compared with the bulk materialread more
Citations
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Chemical Vapor Deposition Growth and Applications of Two-Dimensional Materials and Their Heterostructures
TL;DR: This review of the challenges in the CVD growth of 2D materials highlights recent advances in the controlled growth of single crystal 2Dmaterials, with an emphasis on semiconducting transition metal dichalcogenides.
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Computational 2D Materials Database: Electronic Structure of Transition-Metal Dichalcogenides and Oxides
TL;DR: In this article, a comprehensive first-principles study of the electronic structure of 51 semiconducting monolayer transition-metal dichalcogenides and -oxides in the 2H and 1T hexagonal phases is presented.
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van der Waals Epitaxy of MoS2 Layers Using Graphene As Growth Templates
Yumeng Shi,Wu Zhou,Wu Zhou,Ang-Yu Lu,Wenjing Fang,Yi-Hsien Lee,Yi-Hsien Lee,Allen Hsu,Soo Min Kim,Ki Kang Kim,Hui Ying Yang,Lain-Jong Li,Juan Carlos Idrobo,Jing Kong +13 more
TL;DR: This simple chemical vapor deposition method provides a unique approach for the synthesis of graphene heterostructures and surface functionalization of graphene and possesses great potential toward the development of new optical and electronic devices as well as a wide variety of newly synthesizable compounds for catalysts.
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Large-area synthesis of highly crystalline WSe2 monolayers and device applications
Jing Kai Huang,Jiang Pu,Chang Lung Hsu,Ming-Hui Chiu,Zhen-Yu Juang,Yung Huang Chang,Wen-Hao Chang,Yoshihiro Iwasa,Taishi Takenobu,Lain-Jong Li,Lain-Jong Li +10 more
TL;DR: The introduction of hydrogen in the reaction chamber helps to activate the selenization of WO3, where large-size WSe2 monolayer flakes or thin films can be successfully grown and the resistor-loaded inverter based on a WSe 2 film, with a gain of ∼13, further demonstrates its applicability for logic-circuit integrations.
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Probing excitonic dark states in single-layer tungsten disulphide
Ziliang Ye,Ting Cao,Ting Cao,Kevin O'Brien,Hanyu Zhu,Xiaobo Yin,Yuan Wang,Steven G. Louie,Steven G. Louie,Xiang Zhang +9 more
TL;DR: Experimental evidence of a series of excitonic dark states in single-layer WS2 using two-photon excitation spectroscopy is reported, and it is proved that the excitons are of Wannier type, meaning that each exciton wavefunction extends over multiple unit cells, but with extraordinarily large binding energy.
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TL;DR: The transition metal dichalcogenides are about 60 in number as discussed by the authors, and two-thirds of these assume layer structures and can be cleaved down to less than 1000 A and are then transparent in the region of direct band-to-band transitions.