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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Lattice dynamics in mono- and few-layer sheets of WS2 and WSe2
Weijie Zhao,Zohreh Ghorannevis,Kiran Kumar Amara,Jing Ren Pang,Minglin Toh,Xin Zhang,Christian Kloc,Ping-Heng Tan,Goki Eda +8 more
TL;DR: In this paper, the Raman spectra of atomically thin sheets of WS2 and WSe2, isoelectronic compounds of MoS2, in the mono-to few-layer thickness regime were analyzed.
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Photovoltaic effect in few-layer black phosphorus PN junctions defined by local electrostatic gating.
Michele Buscema,Dirk J. Groenendijk,Gary A. Steele,Herre S. J. van der Zant,Andres Castellanos-Gomez +4 more
TL;DR: Few-layer black phosphorus is a recently isolated 2D semiconductor with direct bandgap, high mobility, large current on/off ratios and ambipolar operation, and electrostatic control of the local charge carrier type and density is demonstrated in the device.
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Valley Zeeman effect in elementary optical excitations of monolayer WSe2
TL;DR: The valley pseudospin of transition metal dichalcogenides has an extra degree of freedom associated with the shape of the energy bands and can be manipulated using magnetic fields as mentioned in this paper.
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Tuning Interlayer Coupling in Large-Area Heterostructures with CVD-Grown MoS2 and WS2 Monolayers
Sefaattin Tongay,Wen Fan,Wen Fan,Jun Kang,Joonsuk Park,Unsal Koldemir,Joonki Suh,Deepa S. Narang,Kai Liu,Jie Ji,Jingbo Li,Robert Sinclair,Junqiao Wu,Junqiao Wu,Junqiao Wu +14 more
TL;DR: This work demonstrates large-area (>tens of micrometers) heterostructures of CVD-grown WS2 and MoS2 monolayers, where the interlayer interaction is externally tuned from noncoupling to strong coupling, which opens up venues to creating new material systems with rich functionalities and novel physical effects.
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: 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.