Study of the Electrical Properties of Monolayer MoS2 Semiconductor

2013 ◽  
Vol 651 ◽  
pp. 193-197 ◽  
Author(s):  
Xi Ying Ma
Keyword(s):  
Electrical Properties ◽  
Carrier Concentration ◽  
Carrier Density ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Intrinsic Carrier Concentration ◽  
2D Semiconductors ◽  
2D System ◽  
Concentration Equation ◽  
Very High

We present the study of the electrical properties of monolayer MoS2 in terms of semiconductor theory. The free electron and hole concentrations formulas in two-dimensional (2D) semiconductors have been developed based on three-dimensional (3D) semiconductors theory, and derived the intrinsic carrier concentration equation of 2D system. Using these equations, we simulated the intrinsic carrier concentration in monolayer MoS2 with temperature. The intrinsic carrier density in monolayer MoS2 increases exponentially with temperature, but it lows a few orders of magnitude than that of 3D semiconductor. It means that monolayer MoS2 based devices can operated at very high temperatures. Accordingly, the conductivity and resistivity were simulated for 2D MoS2, the former increases exponentially while the latter decreases with temperature or carrier concentration.

Nanopillar modified high-sensitivity asymmetric Graphene-GaN photodetector

Nanoscale ◽  
2021 ◽  
Author(s):  
Chang Liu ◽  
Xiaodong Li ◽  
Tiangui Hu ◽  
Wenkai Zhu ◽  
Faguang Yan ◽  
...  
Keyword(s):  
Electrical Properties ◽  
High Performance ◽  
2D Materials ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Optical And Electrical Properties ◽  
Two Dimensional

Integration of two dimensional (2D) materials with three dimensional (3D) semiconductors reveals intriguing optical and electrical properties that surpass those of the original materials. Here we report the high performance...

Three-dimensional (3D) system versus two-dimensional (2D) system for laparoscopic resection of adrenal tumors: a case-control study

2020 ◽  
Vol 405 (8) ◽  
pp. 1163-1173 ◽  
Author(s):  
José Ignacio Rodríguez-Hermosa ◽  
Alejandro Ranea ◽  
Olga Delisau ◽  
Pere Planellas-Giné ◽  
Lídia Cornejo ◽  
...  
Keyword(s):  
Case Control Study ◽  
Laparoscopic Resection ◽  
Three Dimensional ◽  
Case Control ◽  
Adrenal Tumors ◽  
Two Dimensional ◽  
System Versus ◽  
2D System ◽  
Control Study

Dodecahedron- and Bowl-Shaped Structures C20

1992 ◽  
Vol 270 ◽  
Author(s):  
Zdenék Slanina ◽  
Ludwik Adamowicz
Keyword(s):  
High Temperature ◽  
Temperature Region ◽  
Relative Stability ◽  
Three Dimensional ◽  
Two Dimensional ◽  
High Temperature Region ◽  
Relative Stabilities ◽  
One Dimensional ◽  
Very High ◽  
Quantumchemical Method

ABSTRACTPurely carbonaceous aggregates C20 have been studied by the AM1 quantumchemical method. In addition to one dodecahedron-shaped structure possessing C1 symmetry another three-dimensional species is revealed, viz. a bowl-shaped structureof C5v symmetry (and also one two-dimensional and two one-dimensional species). Temperature dependence of the relative stabilities of both three-dimensional structures is evaluated, showing that in the relevant temperature region the fullerenic species is prevailing. However, in a very high temperature region a relative-stability interchange has been predicted.

scholarly journals The anomalous behavior of liquids in three-dimensional and two-dimensional spaces

2021 ◽  
Vol 13 (2) ◽  
pp. 111-118
Author(s):  
Yury D. Fomin ◽  
◽  
Elena N. Tsiok ◽  
Anton B. Teslyuk ◽  
Valentin N. Ryzhov ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Space Dimension ◽  
Three Dimensional ◽  
Anomalous Behavior ◽  
Two Dimensional ◽  
Step Width ◽  
Density Anomaly ◽  
2D System ◽  
Potential Parameters ◽  
Dynamics Method

Using a molecular dynamics method water-like anomalies in a core-softened system depending on the potential parameters and space dimension were investigated. We have examined the anomalies of density, diffusion and structure and have shown that the sequence of anomalous regions cardinally depends on the repulsive step width and space dimension. Thus, in a three-dimensional (3D) system with small values of the step width the sequence of anomalous regions is the same as in water, whereas in a two-dimensional (2D) system – as in liquid silica. With an increase in the step width, an inversion of the regions of the diffusion anomaly and of the density anomaly is observed. Such an unusual sequence of anomalous regions different from water and liquid silica is exclusively caused by the step width and does not depend on the space dimension.

Silicene Nanoribbons and Nanopores for Nanoelectronic Devices and Applications

2017 ◽  
pp. 39-69
Author(s):  
Hatef Sadeghi ◽  
Sara Sangtarash
Keyword(s):  
Power Generation ◽  
Electrical Properties ◽  
Thermoelectric Power ◽  
Carrier Concentration ◽  
Field Effect ◽  
Electrical Conductance ◽  
Analytical Models ◽  
Two Dimensional ◽  
Silicene Nanoribbons ◽  
Effect Transistor

Given the compatibility of silicene with existing semiconductor techniques, and a need for new materials to continue Moore's low, it is natural to ask if this material can form a platform as field effect transistor. Here we provide analytical models to study the electrical properties of two dimensional silicene such as electrical conductance, carrier concentration, mobility and magneto-conductance. Furthermore, we show that silicene nanoribbons and nanopores can be used as a discriminating sensor for DNA sequencing and for efficient thermoelectric power generation.

The purine–carboxylate-containing coordination polymer poly[[μ4-1-(2-carboxylatoethyl)-6-oxo-6,9-dihydro-1H-purin-9-ido]zinc(II)]

2013 ◽  
Vol 69 (11) ◽  
pp. 1314-1316
Author(s):  
Wen-Juan Ma ◽  
Guo-Ting Li
Keyword(s):  
Thermal Stability ◽  
Coordination Polymer ◽  
Title Compound ◽  
Topological Structure ◽  
Three Dimensional ◽  
Two Dimensional ◽  
One Dimensional ◽  
Metal Organic ◽  
Very High ◽  
Thermal Stability Of

The title compound, [Zn(C8H6N4O3)]nor [Zn(L)]n[H2Lis 3-(6-oxo-6,9-dihydro-1H-purin-1-yl)propionic acid], crystallized as a nonmerohedral twin. The ZnIIcation is four-coordinated, ligated by two carboxylate O atoms from twoLligands and two N atoms from another two ligands. Each ligand bridges four ZnIIcentres, extending the structure into a three-dimensional polymer with a 4-connected (65,41) topological structure containing two-dimensional homochiral layers constructed from one-dimensional metal–organic helices. Investigation of the thermal stability of the compound shows that the network has very high thermostability and is stable up to 720 K.

A Comparison Between the Accuracy of Two-Dimensional and Three-Dimensional Strain Measurements

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Niranjan Desai ◽  
Joel Poling ◽  
Gregor Fischer ◽  
Christos Georgakis
Keyword(s):  
Structural Damage ◽  
Measurement Techniques ◽  
Three Dimensional ◽  
Image Correlation ◽  
3D Measurement ◽  
Two Dimensional ◽  
Strain Measurements ◽  
Out Of Plane ◽  
2D System ◽  
Plane Displacement

This investigation determined the effect of specimen out-of-plane movement on the accuracy of strain measurement made applying two-dimensional (2D) and three-dimensional (3D) measurement approaches using the representative, state-of-the-art digital image correlation (DIC)-based tool ARAMIS. DIC techniques can be used in structural health monitoring (SHM) by measuring structural strains and correlating them to structural damage. This study was motivated by initially undetected damage at low strains in connections of a real-world bridge, whose detection would have prevented its propagation, resulting in lower repair costs. This study builds upon an initial investigation that concluded that out-of-plane specimen movement results in noise in DIC-based strain measurements. The effect of specimen out-of-plane displacement on the accuracy of strain measurements using the 2D and 3D measurement techniques was determined over a range of strain values and specimen out-of-plane displacements. Based upon the results of this study, the 2D system could measure strains as camera focus was being lost, and the effect of the loss of focus became apparent at 1.0 mm beam out-of-plane displacement while measuring strain of the order of magnitude of approximately 0.12%. The corresponding results for the 3D system demonstrate that the beam out-of-plane displacement begins to affect the accuracy of the strain measurements at approximately 0.025% strain for all magnitudes of out-of-plane displacement, and the 3D ARAMIS system can make accurate strain measurements at up to 2.5 mm amplitude at this strain. Finally, based upon the magnitudes of strain and out-of-plane displacement amplitudes that typically occur in real steel bridges, it is advisable to use the 3D system for SHM of stiff structures instead of the 2D system.

Differences in The Growth Mechanism of InxGa1−xAs on GaAs Studied by The Electrical Properties of Al0.3Ga0.7As/InxGa1−xAs Heterostructures (0.2 ≤ × ≤ 0.4)

1992 ◽  
Vol 263 ◽  
Author(s):  
T. Schweizer ◽  
K. Köhler ◽  
P. Ganser ◽  
P. Hiesinger ◽  
W. Rothemund
Keyword(s):  
Electrical Properties ◽  
Electron Mobility ◽  
Three Dimensional ◽  
Interface Roughness ◽  
Growth Mode ◽  
Misfit Dislocations ◽  
Anisotropic Growth ◽  
Two Dimensional ◽  
Critical Layer Thickness ◽  
Dimensional Growth

ABSTRACTLattice mismatched InxGa1−xAs layers with InAs mole fractions below 0.25 grow in a two dimensional growth mode on GaAs. If the thickness of these layers is beyond the critical layer thickness the strain relaxes through misfit dislocations. The misfit dislocation density in the <011> and <01-1> direction differs for n-type layers. This results in a highly anisotropic electron mobility for GaAs/InxGa1−xAs/Al0.3Ga0.7As inverted HEMT structures. A higher electron mobility in the < 011 > direction is measured in comparison to the <01-1> direction. The resistance ratio in the two perpendicular directions exceeds 105. For a three dimensional growth mode, the InxGa1−xAs layer shows interface roughness which degrades the transport properties of the normal Al0.3Ga0.7As/ InxGa1−xAs/ GaAs HEMT structures more than the inverted GaAs/InxGa1−xAs/ Al0.3Ga0.7As HEMT structures. For a three dimensional growth mode, an anisotropic electron mobility for Al0.3Ga0.7As/InxGal, As/GaAs HEMT structures is also observed. For these structures the highest electron mobility is measured in the < 01-1 > direction. This anisotropy could be explained by anisotropic growth rates in the <011> and < 01-1 > directions which results in growth islands with asymmetric extensions.

scholarly journals Modulation doping of transition metal dichalcogenide/oxide heterostructures

2017 ◽  
Vol 5 (2) ◽  
pp. 376-381 ◽  
Author(s):  
Kang Xu ◽  
Yi Wang ◽  
Yuda Zhao ◽  
Yang Chai
Keyword(s):  
Transition Metal ◽  
Physical Properties ◽  
Carrier Density ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Modulation Doping ◽  
Oxide Heterostructures ◽  
2D Semiconductors

Control of carrier type and carrier density provides a way to tune the physical properties of two-dimensional (2D) semiconductors.

scholarly journals The Use of Three-dimensional Ultrasound in Gynecological Patients

2008 ◽  
Vol 2 (4) ◽  
pp. 10-16 ◽  
Author(s):  
Juan Luis Alcázar
Keyword(s):  
Clinical Practice ◽  
Imaging Modality ◽  
Power Doppler ◽  
Three Dimensional ◽  
Uterine Cavity ◽  
Current Status ◽  
Two Dimensional ◽  
Technical Features ◽  
Very High ◽  
Gynecologic Patients

Abstract Two-dimensional ultrasound is commonly used in gynecologic patients. It has been shown to be very useful for diagnosing pelvic pathology in both asymptomatic and symptomatic patients. Three-dimensional ultrasound is a new imaging modality, which is being introduced into clinical practice. Although this technique will not probably replace two-dimensional ultrasound, it is being increasingly used. It has been reported that 3DUS is a very high reproducible technique that may have applications in the field of gynecology. These applications include imaging of the uterus, uterine cavity, adnexa and pelvic floor, as well as very interesting applications using three-dimensional power-Doppler ultrasound. The aim of this paper is addressing some technical features of three-dimensional ultrasound and reviewing its current status in clinical practice.

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