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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Epitaxial monolayer MoS2 on mica with novel photoluminescence.
Qingqing Ji,Yanfeng Zhang,Teng Gao,Yu Zhang,Donglin Ma,Mengxi Liu,Yubin Chen,Xiao-Fen Qiao,Ping-Heng Tan,Min Kan,Ji Feng,Qiang Sun,Zhongfan Liu +12 more
TL;DR: This study has successfully grown predominantly monolayer MoS2 on an inert and nearly lattice-matching mica substrate by using a low-pressure chemical vapor deposition method, and the homogeneously strained high-quality monolayers prepared in this study could competitively be exploited for a variety of future applications.
Journal ArticleDOI
Targeted Synthesis of 2H- and 1T-Phase MoS2 Monolayers for Catalytic Hydrogen Evolution.
Kun Chang,Xiao Hai,Xiao Hai,Hong Pang,Hong Pang,Huabin Zhang,Li Shi,Li Shi,Guigao Liu,Guigao Liu,Huimin Liu,Guixia Zhao,Mu Li,Mu Li,Jinhua Ye +14 more
TL;DR: Through a facile and effective strategy by employing lithium molten salts the controlled synthesis of 2H- and 1T-MoS2 monolayers with high-yield production is achieved, which deliver respective advantages in the field of electro- and photo-catalytic hydrogen evolution.
Journal ArticleDOI
The effect of the substrate on the Raman and photoluminescence emission of single-layer MoS2
TL;DR: In this paper, the authors quantitatively study the Raman and photoluminescence (PL) emission from single-layer molybdenum disulfide (MoS2) on dielectric (SiO2, hexagonal boron nitride, mica and polymeric dielectrics Gel-Film®) and conducting substrates (Au and few-layer graphene).
Journal ArticleDOI
Plasma-assisted fabrication of monolayer phosphorene and its Raman characterization
Wanglin Lu,Haiyan Nan,Jinhua Hong,Yuming Chen,Chen Zhu,Zheng Liang,Xiangyang Ma,Zhenhua Ni,Chuanhong Jin,Ze Zhang +9 more
TL;DR: In this paper, a successful experimental approach to fabricate monolayer phosphorene by mechanical cleavage and the following Ar+ plasma thinning process was introduced. And the thickness of monolayers was unambiguously determined by optical contrast combined with atomic force microscope (AFM).
Journal ArticleDOI
Determination of band alignment in the single-layer MoS2/WSe2 heterojunction
Ming-Hui Chiu,Chendong Zhang,Hung-Wei Shiu,Chih Piao Chuu,Chang-Hsiao Chen,Chih Yuan S. Chang,Chia Hao Chen,Mei-Yin Chou,Mei-Yin Chou,Mei-Yin Chou,Chih-Kang Shih,Lain-Jong Li,Lain-Jong Li +12 more
TL;DR: In this paper, the authors measured the conduction and valance band offsets at the interface between two two-dimensional materials: molybdenum disulphide and tungsten diselenide.
References
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