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Janus Monolayer Transition Metal Dichalcogenides
Jing Zhang,Shuai Jia,Kholmanov Iskandar,Liang Dong,Dequan Er,Weibing Chen,Hua Guo,Zehua Jin,Vivek B. Shenoy,Li Shi,Jun Lou +10 more
TL;DR: In this article, a novel crystal configuration of sandwiched S-Mo-Se structure (Janus SMoSe) at the monolayer limit has been synthesized and carefully characterized.
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Abstract: A novel crystal configuration of sandwiched S-Mo-Se structure (Janus SMoSe) at the monolayer limit has been synthesized and carefully characterized in this work. By controlled sulfurization of monolayer MoSe2 the top layer of selenium atoms are substituted by sulfur atoms while the bottom selenium layer remains intact. The peculiar structure of this new material is systematically investigated by Raman, photoluminescence and X-ray photoelectron spectroscopy and confirmed by transmission-electron microscopy and time-of-flight secondary ion mass spectrometry. Density-functional theory calculations are performed to better understand the Raman vibration modes and electronic structures of the Janus SMoSe monolayer, which are found to correlate well with corresponding experimental results. Finally, high basal plane hydrogen evolution reaction (HER) activity is discovered for the Janus monolayer and DFT calculation implies that the activity originates from the synergistic effect of the intrinsic defects and structural strain inherent in the Janus structure.
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Citations
Two-dimensional transition metal dichalcogenides: interface and defect engineering
TL;DR: Two-dimensional transition metal dichalcogenides (TMDCs) have been considered as promising candidates for next generation nanoelectronics and their corresponding applications in electronic and optoelectronic devices.
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First-Principles Prediction of a Room-Temperature Ferromagnetic Janus VSSe Monolayer with Piezoelectricity, Ferroelasticity, and Large Valley Polarization
TL;DR: A strain-driven 90° lattice rotation is found in the magnetic VSSe monolayer with an extremely high reversal strain, indicating an intrinsic ferroelasticity and the combination of piezoelectricity and valley polarization make magnetic 2D Janus VSSe a tantalizing material for potential applications in nanoelectronics, optoelectronic, and valleytronics.
Electronic and Optical Properties of Pristine and Vertical and Lateral Heterostructures of Janus MoSSe and WSSe
TL;DR: On the basis of electron-electron self-energy corrections, quasiparticle band structures of Janus MoSSe and WSSe are identified and the excitonic effects are demonstrated to play a dominate role in the optical response, suggesting the possible formation of 1D electron or hole gas in such electronic heterostructures.
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Novel structured transition metal dichalcogenide nanosheets
TL;DR: This review focuses on the most recent important discoveries in the preparation, characterization and application of these new-structured ultrathin 2D layered TMDs.
Two-dimensional Janus PtSSe for photocatalytic water splitting under the visible or infrared light
TL;DR: Wang et al. as discussed by the authors proposed 2D Janus PtSSe with compelling photocatalytic properties, which were investigated by means of first-principles calculations.
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References
Optoelectronic properties of type-II SePtTe/InS van der Waals heterojunction
TL;DR: In this paper, the authors explored the van der Waals (vdW) heterojunction based on the Janus structure of the 1T-PtTe2 for the potential application in the excitonic solar cell.
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High Curie temperatures in Gd-dihalide Janus monolayers
TL;DR: In this article, the authors used density functional theory combined with Monte Carlo simulations to predict the cleavage energies of monolayers 2 H - GdX 2 (X, Y, Cl, Br, I) and GdXY.
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The electronic properties of hydrogenated Janus MoSSe monolayer: a first principles investigation
Xinxin Zhang,Yi Song,Fuchun Zhang,Qiang Fan,Hong Jin,Shan-Jun Chen,Yuanyuan Jin,Shufang Gao,Yi Xiao,Nsajigwa Mwankemwa,Long Jiang,Weibin Zhang +11 more
- 23 Aug 2019
TL;DR: In this article, the geometry, stability and electronic properties of hydrogenated Janus MoSSe monolayer (MoSSe-Hx) (x=0-16) were investigated by first-principles calculations.
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Stacking-dependent Rashba spin-splitting in Janus bilayer transition metal dichalcogenides: The role of in-plane strain and out-of-plane electric field
TL;DR: In this article, the structural, electronic and spintronic properties of the two-dimensional (2D) Janus bilayer transition metal dichalcogenides (TMDs) were investigated.
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van der Waals heterostructure for photocatalysis: Graphitic carbon nitride and Janus transition-metal dichalcogenides
TL;DR: In this paper, the photocatalytic properties of two-dimensional semiconductors were investigated in a van der Waals heterostructure, where the photogenerated electrons and holes were separated in the MoXY layers, and also generated high overpotential for the redox reactions.
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