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
Electric stress-induced threshold voltage instability of multilayer MoS2 field effect transistors.
Kyungjune Cho,Woanseo Park,Juhun Park,Hyunhak Jeong,Jingon Jang,Taeyoung Kim,Woong-Ki Hong,Seunghun Hong,Takhee Lee +8 more
TL;DR: This study will be helpful in understanding the electrical-stress-induced instability of the MoS2-based electronic devices and will also give insight into the design of desirable devices for electronics applications.
Journal ArticleDOI
Imaging exciton–polariton transport in MoSe2 waveguides
Fengrui Hu,Fengrui Hu,Y. Luan,Y. Luan,Marie Scott,Jiaqiang Yan,Jiaqiang Yan,D. G. Mandrus,D. G. Mandrus,Xiaodong Xu,Zhe Fei,Zhe Fei +11 more
TL;DR: In this article, a nano-optical imaging study of waveguide EPs in MoSe2, a prototypical van der Waals (vdW) semiconductor, was performed.
Journal ArticleDOI
Diffusion-Controlled Epitaxy of Large Area Coalesced WSe2 Monolayers on Sapphire
Xiaotian Zhang,Tanushree H. Choudhury,Mikhail Chubarov,Yu Xiang,Bhakti Jariwala,Fu Zhang,Nasim Alem,Gwo-Ching Wang,Joshua A. Robinson,Joan M. Redwing +9 more
TL;DR: A multistep diffusion-mediated process was developed to control the nucleation density, size, and lateral growth rate of WSe2 domains on c-plane sapphire for the epitaxial growth of large area monolayer films by gas source chemical vapor deposition (CVD).
Journal ArticleDOI
Visualization and quantification of transition metal atomic mixing in Mo 1− x W x S 2 single layers
TL;DR: Statistics of the homo- and heteroatomic coordinates in single-layered Mo1−xWxS2 from the atomically resolved scanning transmission electron microscope images are obtained and the degree of alloying for the transition metal elements (Mo or W) is quantified.
Journal ArticleDOI
Germanium monosulfide monolayer: a novel two-dimensional semiconductor with a high carrier mobility
TL;DR: In this article, the authors predicted that a novel 2D IV-VI material, namely germanium monosulfide (GeS) monolayer, is a rather desirable candidate.
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.