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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Air-Stable Surface Charge Transfer Doping of MoS2 by Benzyl Viologen
Daisuke Kiriya,Mahmut Tosun,Mahmut Tosun,Peida Zhao,Peida Zhao,Jeong Seuk Kang,Jeong Seuk Kang,Ali Javey,Ali Javey +8 more
TL;DR: Benzyl viologen (BV), which has one of the highest reduction potentials of all electron-donor organic compounds, is demonstrated as a surface charge transfer donor for MoS2 flakes, exhibiting excellent stability in both ambient air and vacuum.
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Laser-Thinning of MoS2: On Demand Generation of a Single-Layer Semiconductor
Andres Castellanos-Gomez,Maria Barkelid,Albert Goossens,V. E. Calado,H. S. J. van der Zant,Gary A. Steele +5 more
TL;DR: This work generates single layers in arbitrary shapes and patterns with feature sizes down to 200 nm and shows that the resulting two-dimensional crystals have optical and electronic properties comparable to that of pristine exfoliated MoS(2) single layers.
Journal ArticleDOI
Voltage-controlled quantum light from an atomically thin semiconductor
Chitraleema Chakraborty,Laura Kinnischtzke,Kenneth M. Goodfellow,Ryan Beams,A. Nick Vamivakas +4 more
TL;DR: The possibility of leveraging the atomically thin semiconductor tungsten diselenide (WSe2) as a host for quantum dot-like defects is demonstrated and it is reported that this previously unexplored solid-state quantum emitter in WSe2 generates single photons with emission properties that can be controlled via the application of external d.c. electric and magnetic fields.
Journal ArticleDOI
GaS and GaSe ultrathin layer transistors.
Dattatray J. Late,B. T. Liu,Jiajun Luo,Aiming Yan,H. S. S. Ramakrishna Matte,Matthew Grayson,C. N. R. Rao,Vinayak P. Dravid +7 more
TL;DR: Room-temperature, bottom-gate, field-effect transistor characteristics of 2D ultrathin layer GaS and GaSe prepared from the bulk crystals using a micromechanical cleavage technique are reported.
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Exciton Radiative Lifetimes in Two-Dimensional Transition Metal Dichalcogenides
TL;DR: The wide radiative lifetime tunability, together with the ability shown here to predict radiative lifetimes from computations, hold unique potential to manipulate excitons in TMDs and their heterostructures for application in optoelectronics and solar energy conversion.
References
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