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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Mechanism of Gold-Assisted Exfoliation of Centimeter-Sized Transition-Metal Dichalcogenide Monolayers
Matěj Velický,Matěj Velický,Matěj Velický,Gavin Donnelly,William Hendren,Stephen McFarland,Declan Scullion,William J. I. DeBenedetti,Gabriela C. Correa,Yimo Han,Andrew J. Wain,Melissa A. Hines,David A. Muller,Kostya S. Novoselov,Héctor D. Abruña,Robert M. Bowman,Elton J. G. Santos,Fumin Huang +17 more
TL;DR: Gold-assisted mechanical exfoliation of monolayer molybdenum disulfide, up to a centimeter scale, is demonstrated and electrochemical characterization reveals intriguing interactions between monolayers MoS2 and Au.
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Atomistic insight into the oxidation of monolayer transition metal dichalcogenides: from structures to electronic properties
TL;DR: In this article, the authors showed that a perfect single-layer sheet of TMDs stays intact when exposed in O2 due to the weak physical adsorption of O2.
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Two-dimensional semiconductors in the regime of strong light-matter coupling
Christian Schneider,Mikhail M. Glazov,Tobias Korn,Sven Höfling,Sven Höfling,Bernhard Urbaszek +5 more
TL;DR: The optical properties of transition metal dichalcogenide monolayers are widely dominated by excitons, Coulomb-bound electron-hole pairs as mentioned in this paper, which give rise to narrow-band, well-pronounced optical transitions, which can be brought into resonance with electromagnetic fields in microcavities and plasmonic nanostructures.
Journal ArticleDOI
Electronic Tuning of 2D MoS2 through Surface Functionalization.
Emily P. Nguyen,Benjamin J. Carey,Jian Zhen Ou,Joel van Embden,Joel van Embden,Enrico Della Gaspera,Adam F. Chrimes,Michelle J. S. Spencer,Serge Zhuiykov,Kourosh Kalantar-zadeh,Torben Daeneke +10 more
TL;DR: These findings allow the tuning of energy barriers between 2D MoS2 and other materials, which can lead to improved control over 2DMoS2 -based electronic and optical devices and catalysts.
Journal ArticleDOI
Topological origin of quasi-flat edge band in phosphorene
TL;DR: In this paper, the authors explore the mechanism of the emergence of the quasi-flat band by employing the topological argument invented to explain successfully the flat band familiar in graphene and show that the quasi flat band can be controlled by applying in-plane electric field perpendicular to the ribbon direction.
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