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
More filters
Journal ArticleDOI
Active metamaterials and metadevices: a review
Journal ArticleDOI
Optical manipulation of valley pseudospin
TL;DR: In this paper, the authors demonstrate all-optical control of the valley coherence by means of the pseudomagnetic field associated with the optical Stark effect, and demonstrate the possibility of generation, manipulation, and detection of valley pseudospin by coupling to photons.
Journal ArticleDOI
Biexciton Emission from Edges and Grain Boundaries of Triangular WS2 Monolayers
Min Su Kim,Seok Joon Yun,Yongjun Lee,Changwon Seo,Gang Hee Han,Ki Kang Kim,Young Hee Lee,Jeongyong Kim +7 more
TL;DR: A comprehensive nanoscale spectroscopic investigation sheds light on the dynamic competition between exciton complexes occurring in monolayer WS2, suggesting a rich variety of ways to engineer new nanophotonic functions using 2D transition metal dichalcogenide monolayers.
Journal ArticleDOI
Layered semiconductor molybdenum disulfide nanomembrane based Schottky-barrier solar cells
TL;DR: Schottky-barrier solar cells employing a stack of layer-structured semiconductor molybdenum disulfide (MoS(2)) nanomembranes, synthesized by the chemical-vapor-deposition method, as the critical photoactive layer are demonstrated.
Journal ArticleDOI
The rising star of 2D black phosphorus beyond graphene: synthesis, properties and electronic applications
TL;DR: In this article, the state-of-the-art development, structural properties and preparation routes of 2D black phosphorus have been discussed, and anisotropy involved in mechanical properties, thermal conductivity, carrier transport as well as optical properties is comprehensively discussed.
References
More filters
Journal ArticleDOI
Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene
TL;DR: Graphene is established as the strongest material ever measured, and atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
Journal ArticleDOI
Two-dimensional atomic crystals
Kostya S. Novoselov,Da Jiang,Fred Schedin,Timothy J. Booth,V. V. Khotkevich,Sergey V. Morozov,Andre K. Geim +6 more
TL;DR: By using micromechanical cleavage, a variety of 2D crystals including single layers of boron nitride, graphite, several dichalcogenides, and complex oxides are prepared and studied.
Journal ArticleDOI
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.
Journal ArticleDOI
Anomalous lattice vibrations of single- and few-layer MoS2.
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.
Journal ArticleDOI
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.