Journal ArticleDOI
Tunable band gaps in bilayer transition-metal dichalcogenides
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TLDR
In this article, the authors investigate band-gap tuning in bilayer transition-metal dichalcogenides by external electric fields applied perpendicular to the layers, and show that the fundamental band gap of MoS, MoSe, MoTe, and WS bilayer structures continuously decreases with increasing applied electric fields, eventually rendering them metallic.Abstract:
We investigate band-gap tuning in bilayer transition-metal dichalcogenides by external electric fields applied perpendicular to the layers. Using density functional theory, we show that the fundamental band gap of MoS${}_{2}$, MoSe${}_{2}$, MoTe${}_{2}$, and WS${}_{2}$ bilayer structures continuously decreases with increasing applied electric fields, eventually rendering them metallic. We interpret our results in the light of the giant Stark effect and obtain a robust relationship, which is essentially characterized by the interlayer spacing, for the rate of change of band gap with applied external field. Our study expands the known space of layered materials with widely tunable band gaps beyond the classic example of bilayer graphene and suggests potential directions for fabrication of novel electronic and photonic devices.read more
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Graphene-Like Two-Dimensional Materials
Journal ArticleDOI
Two-dimensional material nanophotonics
TL;DR: In this article, the optical properties and applications of various two-dimensional materials including transition metal dichalcogenides are reviewed with an emphasis on nanophotonic applications, and two different approaches for enhancing their interactions with light: through their integration with external photonic structures, and through intrinsic polaritonic resonances.
Journal ArticleDOI
Bilayer Phosphorene: Effect of Stacking Order on Bandgap and Its Potential Applications in Thin-Film Solar Cells
Jun Dai,Xiao Cheng Zeng +1 more
TL;DR: In this paper, the authors investigated the electronic properties of bilayer phosphorene with different stacking orders and found that the direct bandgap of the bilayers can vary from 0.78 to 1.04 eV.
Journal ArticleDOI
Observation of tunable band gap and anisotropic Dirac semimetal state in black phosphorus
Jimin Kim,Seung Su Baik,Sae Hee Ryu,Yeongsup Sohn,Soohyung Park,Byeong-Gyu Park,Jonathan D. Denlinger,Yeonjin Yi,Hyoung Joon Choi,Keun Su Kim +9 more
TL;DR: The realization of a widely tunable band gap in few-layer black phosphorus doped with potassium is reported, and it is demonstrated that a vertical electric field from dopants modulates the band gap, owing to the giant Stark effect, and tunes the material from a moderate-gap semiconductor to a band-inverted semimetal.
Journal ArticleDOI
Ultrasensitive and Broadband MoS2 Photodetector Driven by Ferroelectrics
Xudong Wang,Xudong Wang,Peng Wang,Jianlu Wang,Weida Hu,Xiaohao Zhou,Nan Guo,Hai Huang,Shuo Sun,Hong Shen,Tie Lin,Minghua Tang,Lei Liao,Anquan Jiang,Jinglan Sun,Xiangjian Meng,Xiaoshuang Chen,Wei Lu,Junhao Chu +18 more
TL;DR: A few-layer MoS2 photodetector driven by poly(vinylidene fluoride-trifluoroethylene) ferroelectrics is achieved, tuned by the ultrahigh electrostatic field from the ferroelectric polarization.
References
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Book
Gmelin handbook of inorganic and organometallic chemistry
Ekkehard Fluck,Leopold Gmelin +1 more
TL;DR: The third supplement to the formula index covers volumes of the "Gmelin: Handbook of Inorganic and Organometallic Chemistry" as discussed by the authors, which is the most complete handbook for chemistry.