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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Thermal conductivity of monolayer MoS2, MoSe2, and WS2: Interplay of mass effect, interatomic bonding and anharmonicity
TL;DR: In this article, the lattice dynamics and thermodynamic properties of monolayer transition metal dichalcogenides were investigated by first principles calculations, and the obtained phonon frequencies and thermal conductivities agree well with the measurements.
Journal ArticleDOI
Atomically Thin Ohmic Edge Contacts Between Two-Dimensional Materials
Marcos H. D. Guimarães,Hui Gao,Yimo Han,Kibum Kang,Saien Xie,Cheol-Joo Kim,David A. Muller,Daniel C. Ralph,Jiwoong Park +8 more
TL;DR: A scalable method to fabricate ohmic graphene edge contacts to two representative monolayer TMDs, MoS2 and WS2, which show linear current-voltage characteristics at room temperature, with ohmic behavior maintained down to liquid helium temperatures.
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Phonon thermal conductivity of monolayer MoS2 sheet and nanoribbons
TL;DR: In this paper, the thermal conduction of monolayer MoS2 sheet and nanoribbons using molecular dynamics simulations was investigated, and the thermal conductivity of MoS 2 was found to be 1.35 W/mK, which is three orders of magnitude lower than that of graphene.
Journal ArticleDOI
A roadmap for electronic grade 2D materials
Natalie Briggs,Shruti Subramanian,Zhong Lin,Xufan Li,Xufan Li,Xiaotian Zhang,Kehao Zhang,Kai Xiao,David B. Geohegan,Robert M. Wallace,Long Qing Chen,Mauricio Terrones,Aida Ebrahimi,Saptarshi Das,Joan M. Redwing,Christopher L. Hinkle,Kasra Momeni,Adri C. T. van Duin,Vin Crespi,Swastik Kar,Joshua A. Robinson +20 more
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Controlled Exfoliation of MoS2 Crystals into Trilayer Nanosheets.
Xiaobin Fan,Pengtao Xu,Yuguang C. Li,Dekai Zhou,Yifan Sun,Minh An T. Nguyen,Mauricio Terrones,Thomas E. Mallouk +7 more
TL;DR: A novel strategy for exfoliating crystalline MoS2 into suspensions of nanosheets with retention of the semiconducting 2H phase using substoichiometric amounts n-butyllithium and electron microscopy.
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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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.