Recent Progress of Two-Dimensional Materials for Ultrafast Photonics

Owing to their extraordinary physical and chemical properties, two-dimensional (2D) materials have aroused extensive attention and have been widely used in photonic and optoelectronic devices, catalytic reactions, and biomedicine. In particular, 2D materials possess a unique bandgap structure and nonlinear optical properties, which can be used as saturable absorbers in ultrafast lasers. Here, we mainly review the top-down and bottom-up methods for preparing 2D materials, such as graphene, topological insulators, transition metal dichalcogenides, black phosphorus, and MXenes. Then, we focus on the ultrafast applications of 2D materials at the typical operating wavelengths of 1, 1.5, 2, and 3 μm. The key parameters and output performance of ultrafast pulsed lasers based on 2D materials are discussed. Furthermore, an outlook regarding the fabrication methods and the development of 2D materials in ultrafast photonics is also presented.

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Predicting two-dimensional topological phases in Janus materials by substitutional doping in transition metal dichalcogenide monolayers

npj 2D Materials and Applications ◽

10.1038/s41699-019-0118-2 ◽

2019 ◽

Vol 3 (1) ◽

Cited By ~ 10

Author(s):

Aniceto B. Maghirang ◽

Zhi-Quan Huang ◽

Rovi Angelo B. Villaos ◽

Chia-Hsiu Hsu ◽

Liang-Ying Feng ◽

...

Keyword(s):

Transition Metal ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Chemical Properties ◽

Industrial Applications ◽

Transition Metal Dichalcogenide ◽

Two Dimensional ◽

Substitutional Doping ◽

Metal Dichalcogenides ◽

Physical And Chemical

Abstract Ultrathin Janus two-dimensional (2D) materials are attracting intense interest currently. Substitutional doping of 2D transition metal dichalcogenides (TMDs) is of importance for tuning and possible enhancement of their electronic, physical and chemical properties toward industrial applications. Using systematic first-principles computations, we propose a class of Janus 2D materials based on the monolayers MX2 (M = V, Nb, Ta, Tc, or Re; X = S, Se, or Te) with halogen (F, Cl, Br, or I) or pnictogen (N, P, As, Sb, or Bi) substitution. Nontrivial phases are obtained on pnictogen substitution of group VB (V, Nb, or Ta), whereas for group VIIB (Tc or Re), the nontrivial phases are obtained for halogen substitution. Orbital analysis shows that the nontrivial phase is driven by the splitting of M-dyz and M-dxz orbitals. Our study demonstrates that the Janus 2D materials have the tunability and suitability for synthesis under various conditions.

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Gate-tunable trion binding energy in monolayer MoS2 with plasmonic superlattice

Nanoscale ◽

10.1039/d0nr02104k ◽

2020 ◽

Vol 12 (34) ◽

pp. 17754-17761

Author(s):

Zhuang Luo ◽

Hao Jia ◽

Liu Lv ◽

Quan Wang ◽

Xiaohong Yan

Keyword(s):

Transition Metal Dichalcogenides ◽

Optoelectronic Devices ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Two Dimensional ◽

Monolayer Mos2 ◽

The World ◽

Metal Dichalcogenides ◽

Physical And Chemical ◽

And Chemical Properties

Two-dimensional transition metal dichalcogenides exhibit promising potential and attract the attention of the world in the application of optoelectronic devices owing to their distinctive physical and chemical properties.

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Recent Advances in Electrical Doping of 2D Semiconductor Materials: Methods, Analyses, and Applications

Nanomaterials ◽

10.3390/nano11040832 ◽

2021 ◽

Vol 11 (4) ◽

pp. 832

Author(s):

Hocheon Yoo ◽

Keun Heo ◽

Md. Hasan Raza Ansari ◽

Seongjae Cho

Keyword(s):

Electrical Properties ◽

Transition Metal Dichalcogenides ◽

Visible Region ◽

Chemical Properties ◽

Electrical Characterization ◽

Semiconductor Materials ◽

Two Dimensional ◽

Potential Applications ◽

Metal Dichalcogenides ◽

Physical And Chemical

Two-dimensional materials have garnered interest from the perspectives of physics, materials, and applied electronics owing to their outstanding physical and chemical properties. Advances in exfoliation and synthesis technologies have enabled preparation and electrical characterization of various atomically thin films of semiconductor transition metal dichalcogenides (TMDs). Their two-dimensional structures and electromagnetic spectra coupled to bandgaps in the visible region indicate their suitability for digital electronics and optoelectronics. To further expand the potential applications of these two-dimensional semiconductor materials, technologies capable of precisely controlling the electrical properties of the material are essential. Doping has been traditionally used to effectively change the electrical and electronic properties of materials through relatively simple processes. To change the electrical properties, substances that can donate or remove electrons are added. Doping of atomically thin two-dimensional semiconductor materials is similar to that used for silicon but has a slightly different mechanism. Three main methods with different characteristics and slightly different principles are generally used. This review presents an overview of various advanced doping techniques based on the substitutional, chemical, and charge transfer molecular doping strategies of graphene and TMDs, which are the representative 2D semiconductor materials.

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Novel layered 2D materials for ultrafast photonics

Nanophotonics ◽

10.1515/nanoph-2020-0030 ◽

2020 ◽

Vol 9 (7) ◽

pp. 1743-1786 ◽

Cited By ~ 3

Author(s):

Shi Li ◽

Cong Wang ◽

Yu Yin ◽

Elfed Lewis ◽

Pengfei Wang

Keyword(s):

2D Materials ◽

Transition Metal Dichalcogenides ◽

Optical Nonlinearity ◽

Optical Devices ◽

Optical Modulators ◽

Laser Applications ◽

Saturable Absorbers ◽

Metal Dichalcogenides ◽

Metal Organic ◽

Ultrafast Photonics

AbstractA range of new 2D materials have recently been reported, including topological insulators, transition-metal dichalcogenides, black phosphorus, MXenes, and metal-organic frameworks, which have demonstrated high optical nonlinearity and Pauli blocking for widespread use as saturable absorbers in pulsed lasers. 2D materials are emerging as a promising platform for ultrashort-pulse fiber laser technology. This review presents a catalog of the various pulsed laser applications based on the series of emerging 2D materials. In addition, novel optical devices using layered materials, such as optical modulators, optical switches, and all-optical devices, are also included. It is anticipated that the development of 2D materials will intensify in the future, providing potentially new and wide-ranging efficacy for 2D materials in ultrafast photonic technology.

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Combined Healing and Doping of Transition Metal Dichalcogenides Through Molecular Functionalization

Journal of Materials Chemistry C ◽

10.1039/d1tc01329g ◽

2021 ◽

Author(s):

Sai Manoj Gali ◽

David Beljonne

Keyword(s):

Transition Metal ◽

Charge Transport ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Two Dimensional ◽

Metal Dichalcogenides

Transition Metal Dichalcogenides (TMDCs) are emerging as promising two-dimensional (2D) materials. Yet, TMDCs are prone to inherent defects such as chalcogen vacancies, which are detrimental to charge transport. Passivation of...

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Molecular chemistry approaches for tuning the properties of two-dimensional transition metal dichalcogenides

Chemical Society Reviews ◽

10.1039/c8cs00169c ◽

2018 ◽

Vol 47 (17) ◽

pp. 6845-6888 ◽

Cited By ~ 68

Author(s):

Simone Bertolazzi ◽

Marco Gobbi ◽

Yuda Zhao ◽

Claudia Backes ◽

Paolo Samorì

Keyword(s):

Transition Metal ◽

Transition Metal Dichalcogenides ◽

Chemical Properties ◽

Two Dimensional ◽

Multifunctional Materials ◽

Molecular Chemistry ◽

Physico Chemical ◽

Metal Dichalcogenides

A variety of molecular chemistry approaches are currently investigated for tailoring the physico-chemical properties of ultrathin transition metal dichalcogenides towards novel hybrid multifunctional materials and devices.

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Waterproof molecular monolayers stabilize 2D materials

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1909500116 ◽

2019 ◽

Vol 116 (42) ◽

pp. 20844-20849 ◽

Cited By ~ 4

Author(s):

Cong Su ◽

Zongyou Yin ◽

Qing-Bo Yan ◽

Zegao Wang ◽

Hongtao Lin ◽

...

Keyword(s):

Transition Metal ◽

Theoretical Analysis ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Water Molecules ◽

Two Dimensional ◽

Ambient Conditions ◽

Molecular Monolayers ◽

Metal Dichalcogenides ◽

Van Der Waals Materials

Two-dimensional van der Waals materials have rich and unique functional properties, but many are susceptible to corrosion under ambient conditions. Here we show that linear alkylamines n-CmH2m+1NH2, with m = 4 through 11, are highly effective in protecting the optoelectronic properties of these materials, such as black phosphorus (BP) and transition-metal dichalcogenides (TMDs: WS2, 1T′-MoTe2, WTe2, WSe2, TaS2, and NbSe2). As a representative example, n-hexylamine (m = 6) can be applied in the form of thin molecular monolayers on BP flakes with less than 2-nm thickness and can prolong BP’s lifetime from a few hours to several weeks and even months in ambient environments. Characterizations combined with our theoretical analysis show that the thin monolayers selectively sift out water molecules, forming a drying layer to achieve the passivation of the protected 2D materials. The monolayer coating is also stable in air, H2 annealing, and organic solvents, but can be removed by certain organic acids.

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Tailorable multifunctionalities in ultrathin 2D Bi-based layered supercell structures

Nanoscale ◽

10.1039/d1nr04975e ◽

2021 ◽

Author(s):

Zihao He ◽

Xingyao Gao ◽

Di Zhang ◽

Ping Lu ◽

Xuejing Wang ◽

...

Keyword(s):

Transition Metal ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Ferromagnetic Behavior ◽

Two Dimensional ◽

Next Generation ◽

Layered Oxide ◽

Nanoelectronic Devices ◽

Potential Applications ◽

Metal Dichalcogenides

Two-dimensional (2D) materials with robust ferromagnetic behavior have attracted great interest because of their potential applications in next-generation nanoelectronic devices. Aside from graphene and transition metal dichalcogenides, Bi-based layered oxide...

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An emerging Janus MoSeTe material for potential applications in optoelectronic devices

Journal of Materials Chemistry C ◽

10.1039/c9tc03936h ◽

2019 ◽

Vol 7 (39) ◽

pp. 12312-12320 ◽

Cited By ~ 14

Author(s):

Xiaoyong Yang ◽

Deobrat Singh ◽

Zhitong Xu ◽

Ziwei Wang ◽

Rajeev Ahuja

Keyword(s):

First Principles ◽

Transition Metal Dichalcogenides ◽

Chemical Properties ◽

Detailed Comparison ◽

Physical And Chemical Properties ◽

First Principles Calculations ◽

Potential Applications ◽

Metal Dichalcogenides ◽

Physical And Chemical ◽

And Chemical Properties

Motivated by the extraordinary physical and chemical properties of Janus transition-metal dichalcogenides (TMDs) due to the change of the crystal field originating from their asymmetry structures, the electronic and optical properties of the MoSeTe monolayer in 2H and 1T phases are systematically studied by first-principles calculations, and a detailed comparison with the parental MoSe2 and MoTe2 monolayer is made.

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