scholarly journals High-frequency rectification via chiral Bloch electrons

2020 ◽  
Vol 6 (13) ◽  
pp. eaay2497 ◽  
Author(s):  
Hiroki Isobe ◽  
Su-Yang Xu ◽  
Liang Fu
Keyword(s):  
High Frequency ◽  
Transition Metal Dichalcogenides ◽  
Material Design ◽  
Alternative Approach ◽  
Wide Range ◽  
Quantum Wave Function ◽  
Limited Applicability ◽  
Metal Dichalcogenides ◽  
Quantum Wave ◽  
Frequency Rectification

Rectification is a process that converts electromagnetic fields into a direct current. Such a process underlies a wide range of technologies such as wireless communication, wireless charging, energy harvesting, and infrared detection. Existing rectifiers are mostly based on semiconductor diodes, with limited applicability to small-voltage or high-frequency inputs. Here, we present an alternative approach to current rectification that uses the intrinsic electronic properties of quantum crystals without using semiconductor junctions. We identify a previously unknown mechanism for rectification from skew scattering due to the inherent chirality of itinerant electrons in time-reversal invariant but inversion-breaking materials. Our calculations reveal large, tunable rectification effects in graphene multilayers and transition metal dichalcogenides. Our work demonstrates the possibility of realizing high-frequency rectifiers by rational material design and quantum wave function engineering.

THE ELECTRONIC STRUCTURE AT ORGANIC–2D MATERIAL HETEROINTERFACES

2021 ◽  
pp. 2140003
Author(s):  
YU LI HUANG ◽  
ANDREW THYE SHEN WEE
Keyword(s):  
Charge Transfer ◽  
Electronic Structures ◽  
Transition Metal Dichalcogenides ◽  
2D Material ◽  
Physical Mechanisms ◽  
Wide Range ◽  
Fundamental Understanding ◽  
Potential Applications ◽  
Metal Dichalcogenides ◽  
Interfacial Charge

Organic–2D material heterostructures have attracted intensive research interest due to their intriguing properties, with a wide range of potential applications in multifunctional flexible electronic and optoelectronic devices. Central to the realization of such devices is a fundamental understanding of the electronic structures at organic–2D material heterointerfaces. The energy level alignment (ELA) at the interface is of paramount importance because it determines the charge transfer barriers between the two materials in contact. In this paper, we discuss the physical mechanisms determining the ELAs, with special attention on interfacial charge transfer at the heterostructures. We review the current understanding of electronic properties at the heterointerfaces formed by the integration of organics with graphene and 2D transition metal dichalcogenides (TMDs), and conclude with a perspective on the future development of organic–2D material heterostructure.

scholarly journals Prediction of the structural and electronic properties of MoxTi1−xS2 monolayers via first principle simulations

2020 ◽  
Vol 10 ◽  
pp. 184798042095509
Author(s):  
Ankit Kumar Verma ◽  
Federico Raffone ◽  
Giancarlo Cicero
Keyword(s):  
Transition Metal ◽  
Electronic Properties ◽  
Transition Metal Dichalcogenides ◽  
Stable Phase ◽  
Two Dimensional ◽  
Electron Hole ◽  
Effective Electron ◽  
Wide Range ◽  
Structural And Electronic Properties ◽  
Metal Dichalcogenides

Two-dimensional transition metal dichalcogenides have gained great attention because of their peculiar physical properties that make them interesting for a wide range of applications. Lately, alloying between different transition metal dichalcogenides has been proposed as an approach to control two-dimensional phase stability and to obtain compounds with tailored characteristics. In this theoretical study, we predict the phase diagram and the electronic properties of Mo xTi1− xS2 at varying stoichiometry and show how the material is metallic, when titanium is the predominant species, while it behaves as a p-doped semiconductor, when approaching pure MoS2 composition. Correspondingly, the thermodynamically most stable phase switches from the tetragonal to the hexagonal one. Further, we present an example which shows how the proposed alloys can be used to obtain new vertical two-dimensional heterostructures achieving effective electron/hole separation.

Recent advances in the field of transition metal dichalcogenides for biomedical applications

Nanoscale ◽  
2018 ◽  
Vol 10 (35) ◽  
pp. 16365-16397 ◽  
Author(s):  
Vipul Agarwal ◽  
Kaushik Chatterjee
Keyword(s):  
Transition Metal ◽  
Biomedical Applications ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Solid Lubrication ◽  
Transition Metal Dichalcogenide ◽  
Unique Combination ◽  
Energy Materials ◽  
Wide Range ◽  
Metal Dichalcogenides

Nanosheets of transition metal dichalcogenide (TMDs), the graphene-like two-dimensional (2D) materials, exhibit a unique combination of properties and have attracted enormous research interest for a wide range of applications including catalysis, functional electronics, solid lubrication, photovoltaics, energy materials and most recently in biomedical applications.

scholarly journals Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

2016 ◽  
Vol 374 (2076) ◽  
pp. 20150318 ◽  
Author(s):  
Manoj K. Jana ◽  
C. N. R. Rao
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Single Layer ◽  
Layered Materials ◽  
Two Dimensional ◽  
2D Layered Materials ◽  
Wide Range ◽  
Buckminster Fullerene ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal

The discovery of graphene marks a major event in the physics and chemistry of materials. The amazing properties of this two-dimensional (2D) material have prompted research on other 2D layered materials, of which layered transition metal dichalcogenides (TMDCs) are important members. Single-layer and few-layer TMDCs have been synthesized and characterized. They possess a wide range of properties many of which have not been known hitherto. A typical example of such materials is MoS 2 . In this article, we briefly present various aspects of layered analogues of graphene as exemplified by TMDCs. The discussion includes not only synthesis and characterization, but also various properties and phenomena exhibited by the TMDCs. This article is part of the themed issue ‘Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene’.

scholarly journals Photo-Detectors Based on Two Dimensional Materials

2021 ◽  
Author(s):  
Mubashir A. Kharadi ◽  
Gul Faroz A. Malik ◽  
Farooq A. Khanday
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Optoelectronic Devices ◽  
Two Dimensional ◽  
Wide Range ◽  
Two Dimensional Materials ◽  
Photo Detectors ◽  
Metal Dichalcogenides ◽  
Application Specific

2D materials like transition metal dichalcogenides, black phosphorous, silicene, graphene are at the forefront of being the most potent 2D materials for optoelectronic applications because of their exceptional properties. Several application-specific photodetectors based on 2D materials have been designed and manufactured due to a wide range and layer-dependent bandgaps. Different 2D materials stacked together give rise to many surprising electronic and optoelectronic phenomena of the junctions based on 2D materials. This has resulted in a lot of popularity of 2D heterostructures as compared to the original 2D materials. This chapter presents the progress of optoelectronic devices (photodetectors) based on 2D materials and their heterostructures.

scholarly journals Wafer scale synthesis of organic semiconductor nanosheets for van der Waals heterojunction devices

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Sirri Batuhan Kalkan ◽  
Emad Najafidehaghani ◽  
Ziyang Gan ◽  
Fabian Alexander Christian Apfelbeck ◽  
Uwe Hübner ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Physical Vapor Deposition ◽  
Field Effect Transistors ◽  
Van Der Waals ◽  
Transition Metal Dichalcogenides ◽  
Wafer Scale ◽  
Heterojunction Devices ◽  
Wide Range ◽  
Conformal Electronics ◽  
Metal Dichalcogenides

AbstractOrganic semiconductors (OSC) are widely used for consumer electronic products owing to their attractive properties such as flexibility and low production cost. Atomically thin transition metal dichalcogenides (TMDs) are another class of emerging materials with superior electronic and optical properties. Integrating them into van der Waals (vdW) heterostructures provides an opportunity to harness the advantages of both material systems. However, building such heterojunctions by conventional physical vapor deposition (PVD) of OSCs is challenging, since the growth is disrupted due to limited diffusion of the molecules on the TMD surface. Here we report wafer-scale (3-inch) fabrication of transferable OSC nanosheets with thickness down to 15 nm, which enable the realization of heterojunction devices. By controlled dissolution of a poly(acrylic acid) film, on which the OSC films were grown by PVD, they can be released and transferred onto arbitrary substrates. OSC crystal quality and optical anisotropy are preserved during the transfer process. By transferring OSC nanosheets (p-type) onto prefabricated electrodes and TMD monolayers (n-type), we fabricate and characterize various electronic devices including unipolar, ambipolar and antiambipolar field-effect transistors. Such vdW p-n heterojunction devices open up a wide range of possible applications ranging from ultrafast photodetectors to conformal electronics.

scholarly journals Tunable Broadband Solar Energy Absorber Based on Monolayer Transition Metal Dichalcogenides Materials Using Au Nanocubes

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 257 ◽  
Author(s):  
Jiakun Li ◽  
Zeqiang Chen ◽  
Hua Yang ◽  
Zao Yi ◽  
Xifang Chen ◽  
...  
Keyword(s):  
Transition Metal ◽  
Solar Energy ◽  
High Efficiency ◽  
Transition Metal Dichalcogenides ◽  
Wavelength Region ◽  
Polarization Angle ◽  
Monolayer Mos2 ◽  
Wide Range ◽  
Metal Dichalcogenides ◽  
Energy Absorbers

In order to significantly enhance the absorption capability of solar energy absorbers in the visible wavelength region, a novel monolayer molybdenum disulfide (MoS2)-based nanostructure was proposed. Local surface plasmon resonances (LSPRs) supported by Au nanocubes (NCs) can improve the absorption of monolayer MoS2. A theoretical simulation by a finite-difference time-domain method (FDTD) shows that the absorptions of proposed MoS2-based absorbers are above 94.0% and 99.7% at the resonant wavelengths of 422 and 545 nm, respectively. In addition, the optical properties of the proposed nanostructure can be tuned by the geometric parameters of the periodic Au nanocubes array, distributed Bragg mirror (DBR) and polarization angle of the incident light, which are of great pragmatic significance for improving the absorption efficiency and selectivity of monolayer MoS2. The absorber is also able to withstand a wide range of incident angles, showing polarization-independence. Similar design ideas can also be implemented to other transition-metal dichalcogenides (TMDCs) to strengthen the interaction between light and MoS2. This nanostructure is relatively simple to implement and has a potentially important application value in the development of high-efficiency solar energy absorbers and other optoelectronic devices.

Topology of transition metal dichalcogenides: the case of the core–shell architecture

Nanoscale ◽  
2020 ◽  
Vol 12 (47) ◽  
pp. 23897-23919
Author(s):  
Jennifer G. DiStefano ◽  
Akshay A. Murthy ◽  
Shiqiang Hao ◽  
Roberto dos Reis ◽  
Chris Wolverton ◽  
...  
Keyword(s):  
Transition Metal ◽  
Review Paper ◽  
Transition Metal Dichalcogenides ◽  
Material Design ◽  
Core Shell ◽  
The Core ◽  
Metal Dichalcogenides ◽  
The Rich

This review paper highlights the rich opportunities of curvature and architecture in transition metal dichalcogenides for improved material design.

scholarly journals Strong Anisotropic Enhancement of Photoluminescence in WS2 Integrated With Plasmonic Nanowire Array

2020 ◽  
Author(s):  
Chunrui Han ◽  
Yu Wang ◽  
Weihu Zhou ◽  
Jianting Ye
Keyword(s):  
Nanowire Array ◽  
Transition Metal Dichalcogenides ◽  
Photonic Devices ◽  
Nanowire Arrays ◽  
Plasmonic Enhancement ◽  
Form Birefringence ◽  
Simultaneous Control ◽  
Wide Range ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal

Abstract Layered transition metal dichalcogenides (TMDCs) have shown great potential for a wide range of applications in photonics and optoelectronics. Nevertheless, valley decoherence severely randomizes its polarization which is important to a light emitter. Plasmonic metasurface with a unique way to manipulate the light-matter interaction may provide an effective and practical solution. Here by integrating TMDCs with plasmonic nanowire arrays, we demonstrate strong anisotropic enhancement of the excitonic emission at different spectral positions. For the indirect bandgap transition in bilayer WS2, multifold enhancement can be achieved with the PL polarization either perpendicular or parallel to the long axis of nanowires, which arises from the coupling of WS2 with localized or guided plasmon modes, respectively. Moreover, PL of a high linearity is obtained in the direct bandgap transition benefiting from, in addition to the plasmonic enhancement, the directional diffraction scattering of nanowire arrays. Our method with enhanced PL intensity contrasts to the conventional form-birefringence based on the aspect ratio of nanowire arrays where the intensity loss is remarkable. Our results provide a prototypical plasmon-exciton hybrid system for anisotropic enhancement of the PL at the nanoscale, enabling simultaneous control of intensity, polarization and wavelength toward practical ultrathin photonic devices based on TMDCs.

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