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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Environmental instability of few-layer black phosphorus
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Role of Interfaces in Two-Dimensional Photocatalyst for Water Splitting
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Low-temperature photocarrier dynamics in monolayer MoS2
TL;DR: In this paper, the authors report on scanning Raman and on temperature-dependent photoluminescence measurements on single-layer MoS2 flakes prepared by exfoliation.
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One‐Pot, Facile, and Versatile Synthesis of Monolayer MoS 2 /WS 2 Quantum Dots as Bioimaging Probes and Efficient Electrocatalysts for Hydrogen Evolution Reaction
Shengjie Xu,Dian Li,Peiyi Wu +2 more
TL;DR: In this article, uniform molybdenum disulfide (MoS2)/tungsten disulfides (WS2) quantum dots are synthesized by the combination of sonication and solvothermal treatment of bulk MoS2/WS2 at a mild temperature.
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Exciton dynamics in suspended monolayer and few-layer MoS₂ 2D crystals
Hongyan Shi,Rusen Yan,Simone Bertolazzi,Jacopo Brivio,Bo Gao,Andras Kis,Debdeep Jena,Huili Grace Xing,Libai Huang +8 more
TL;DR: Fast trapping of excitons by surface trap states was observed in monolayer and few-layer structures, pointing to the importance of controlling surface properties in atomically thin crystals such as MoS₂ along with controlling their dimensions.
References
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Emerging Photoluminescence in Monolayer MoS2
Andrea Splendiani,Liang Sun,Yuanbo Zhang,Tianshu Li,Jonghwan Kim,Chi-Yung Chim,Giulia Galli,Feng Wang,Feng Wang +8 more
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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TL;DR: This work exemplifies the evolution of structural parameters in layered materials in changing from the three-dimensional to the two-dimensional regime by characterized by Raman spectroscopy.
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The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties
J.A. Wilson,A.D. Yoffe +1 more
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.