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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Tailoring the Electronic Structure in Bilayer Molybdenum Disulfide via Interlayer Twist
Arend M. van der Zande,Jens Kunstmann,Alexey Chernikov,Daniel Chenet,Yumeng You,Xiao-Xiao Zhang,Pinshane Y. Huang,Timothy C. Berkelbach,Lei Wang,Fan Zhang,Mark S. Hybertsen,Mark S. Hybertsen,David A. Muller,David R. Reichman,Tony F. Heinz,James Hone +15 more
TL;DR: Electronic structure calculations show the interlayer separation changes with twist due to repulsion between sulfur atoms, resulting in shifts of the indirect optical transition energies.
Journal ArticleDOI
Functionalized graphene and other two-dimensional materials for photovoltaic devices: device design and processing
Zhike Liu,Shu Ping Lau,Feng Yan +2 more
TL;DR: This review will focus on the recent advances in the applications of graphene and other 2D materials in various photovoltaic devices, including organic solar cells, Schottky junctionSolar cells, dye-sensitized solar cells), quantum dot-s Sensitized solar Cells, and perovskite solar cells in terms of the functionalization techniques of the materials, the device design and the device performance.
Journal ArticleDOI
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.
Journal ArticleDOI
Influence of Stoichiometry on the Optical and Electrical Properties of Chemical Vapor Deposition Derived MoS2
In Soo Kim,Vinod K. Sangwan,Deep Jariwala,Joshua D. Wood,Spencer Park,Kan Sheng Chen,Fengyuan Shi,Francisco Ruiz-Zepeda,Arturo Ponce,Miguel Jose-Yacaman,Vinayak P. Dravid,Tobin J. Marks,Mark C. Hersam,Lincoln J. Lauhon +13 more
TL;DR: It is concluded that the electrical and optical properties of monolayer MoS2 crystals can be tuned via stoichiometry engineering to meet the requirements of various applications.
Journal ArticleDOI
A microprocessor based on a two-dimensional semiconductor
TL;DR: A 1-bit implementation of a microprocessor using a two-dimensional semiconductor—molybdenum disulfide that can execute user-defined programs stored in an external memory, perform logical operations and communicate with its periphery is presented.
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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.