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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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Optoelectronic and photocatalytic applications of hBP–XMY (M = Mo, W; (X ≠ Y) = S, Se, Te) van der Waals heterostructures
Tahani A. Alrebdi,Bin Amin +1 more
TL;DR: Using first-principles calculations, the geometry, electronic structure, and optical and photocatalytic performance of novel vdW heterostructures based on hexagonal boron phosphide and Janus monolayers are investigated, showing that the lowest energy transitions are dominated by excitons with a systematic red shift for heavier chalcogen atoms.
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Stacking-tailoring quasiparticle energies and interlayer excitons in bilayer Janus MoSSe
TL;DR: In this paper, the authors reveal that the electronic band structures and interlayer excitons can be dramatically tuned via the stacking sequence of bilayer van der Waals transition metal dichalcogenides with the different intrinsic dipole orientations.
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Two dimensional Janus SGaInSe(SeGaInS)/PtSe2 van der Waals heterostructures for optoelectronic and photocatalytic water splitting applications
TL;DR: In this paper , the SGaInSe(SeGaInS)/PtSe2 van der Waals (vdWs) heterostructures are confirmed to be energetically, dynamically, and thermally stable, indicating that they have a lot of potential for experimental implementation.
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Ultrafast interfacial charge transfer and superior photoelectric conversion properties in one-dimensional Janus-MoSSe/ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>WSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> van der Waals heterostructures
Bao-Jun Cai,Jianing Tan,Long Zhang,Degao Xu,Jiansheng Dong,Gang Ouyang +5 more
TL;DR: Ultrafast interfacial charge transfer and superior photoelectric conversion properties in one-dimensional Janus-MoSSe/WSe2 van der Waals heterostructures.
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