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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Dielectric Screening of Excitons and Trions in Single-Layer MoS2
Yuxuan Lin,Xi Ling,Lili Yu,Shengxi Huang,Allen Hsu,Yi-Hsien Lee,Jing Kong,Mildred S. Dresselhaus,Tomas Palacios +8 more
TL;DR: These findings are helpful to better understand the tightly bound exciton properties in strongly quantum-confined systems and provide a simple approach to the selective and separate generation of excitons or trions with potential applications in excitonic interconnects and valleytronics.
Journal ArticleDOI
Thermal Conductivity of Monolayer Molybdenum Disulfide Obtained from Temperature-Dependent Raman Spectroscopy
Rusen Yan,Jeffrey R. Simpson,Simone Bertolazzi,Jacopo Brivio,Michael Watson,Xufei Wu,Andras Kis,Tengfei Luo,Angela R. Hight Walker,Huili Grace Xing +9 more
TL;DR: In this paper, the temperature-dependent Raman spectra of exfoliated, monolayer molybdenum disulfide (MoS2) in the range of 100-320 K were analyzed.
Journal ArticleDOI
A two-dimensional π–d conjugated coordination polymer with extremely high electrical conductivity and ambipolar transport behaviour
Xing Huang,Peng Sheng,Zeyi Tu,Fengjiao Zhang,Junhua Wang,Hua Geng,Ye Zou,Chong-an Di,Yuanping Yi,Yimeng Sun,Wei Xu,Daoben Zhu +11 more
TL;DR: Four-probe measurements show that the room temperature conductivity of this material can reach up to 1,580 S cm−1, which is the highest value ever reported for coordination polymers, and it displays ambipolar charge transport behaviour and extremely high electron and hole mobilities under field-effect modulation.
Journal ArticleDOI
MoS2/Si Heterojunction with Vertically Standing Layered Structure for Ultrafast, High‐Detectivity, Self‐Driven Visible–Near Infrared Photodetectors
Liu Wang,Jiansheng Jie,Zhibin Shao,Qing Zhang,Xiaohong Zhang,Yuming Wang,Zheng Sun,Shuit-Tong Lee +7 more
TL;DR: In this paper, a self-driven MoS2/Si heterojunction photodetector is proposed, which is sensitive to a broadband wavelength from visible light to near-infrared light, showing an extremely high detectivity up to ≈1013 Jones (Jones = cm Hz 1/2 W−1), and ultrafast response speed of ≈3 μs.
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Computational Study of Metal Contacts to Monolayer Transition-Metal Dichalcogenide Semiconductors
TL;DR: In this article, a new class of semiconductors, monolayer transition-metal dichalcogenides, is proposed to improve the performance of a device's transceivers.
References
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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.