Air-Stable In-Plane Anisotropic GeSe2 for Highly Polarization-Sensitive Photodetection in Short Wave Region

2018 ◽  
Vol 140 (11) ◽  
pp. 4150-4156 ◽  
Author(s):  
Yusi Yang ◽  
Shun-Chang Liu ◽  
Wei Yang ◽  
Zongbao Li ◽  
Yang Wang ◽  
...  
Keyword(s):  
Short Wave ◽  
Wave Region ◽  
Short Wave Region

scholarly journals Method of obtaining and studying the optical properties of carbon quantum dots.

2019 ◽  
Vol 19 (3) ◽  
pp. 226-229
Author(s):  
S.D. Bardasevska ◽  
I.M. Budzulyak ◽  
S.I. Budzulyak ◽  
B.I. Rachiy ◽  
R.V. Ilnytskyi ◽  
...  
Keyword(s):  
Raw Materials ◽  
Wavelength Region ◽  
Short Wave ◽  
Carbon Quantum Dots ◽  
Long Wavelength ◽  
Plant Raw Materials ◽  
Wave Region ◽  
Exciton Mechanism ◽  
Short Wave Region ◽  
Kinetics Of

The proposed method of synthesis of CQDs on the basis of nanoporous carbon obtained from plant raw materials. It is established that in the short-wave region a band is registered, which is due to the exciton mechanism of recombination, whereas in the long-wavelength region it is related to the state of defects. The kinetics of PL extinction is not strictly exponential, which most likely indicates the distributed nature of fading from individual emitters.

Comparison and analysis of optical properties between vertical and inclined GaAs nanostructures

2020 ◽  
Vol 34 (32) ◽  
pp. 2050311
Author(s):  
Yan Sun ◽  
Lei Liu ◽  
Zhisheng Lv ◽  
Xingyue Zhangyang ◽  
Feifei Lu ◽  
...  
Keyword(s):  
Light Absorption ◽  
Structural Parameters ◽  
Short Wave ◽  
Carrier Distribution ◽  
Wave Region ◽  
Absorption Performance ◽  
Inclined Angle ◽  
Short Wave Region ◽  
Light Capture ◽  
Nanowire Structure

In this paper, COMSOL multi-physics field commercial software was used to design the simulation model of GaAs nanostructures array (vertical nanoholes, vertical nanowires, inclined nanoholes and inclined nanowires), and the changes of light absorption of these structures in the wavelength range of 200–840 nm were studied. The electric field distribution, carrier distribution and quantum efficiency of nanostructures are calculated and analyzed under certain structural parameters. The results show that the light absorption performance of nanowire structure in the short-wave region is better than that of the nanoholes structure. With a certain inclined angle, the inclined nanowire structure has a stronger light capture ability than the vertical nanowire structure, and the light absorption of nanowire structure has a minimum value at the 550 nm wavelength.

Mechanical, electronic and optical properties of bulk and monolayer GeSe2

2020 ◽  
Vol 34 (06) ◽  
pp. 2050034
Author(s):  
Congcong Zeng ◽  
Ru Zhang ◽  
Liyuan Wu ◽  
Qian Wang ◽  
Xi Chen ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
First Principles ◽  
Short Wave ◽  
Wide Bandgap ◽  
First Principles Calculations ◽  
Electronic And Optical Properties ◽  
Wave Region ◽  
Bulk Structure ◽  
Short Wave Region

[Formula: see text], a semiconductor with wide bandgap, has attracted wide attention due to its excellent workability in the short-wave region. Here, we reported the mechanical, electronic and optical properties of bulk and monolayer [Formula: see text] by using first-principles calculations. Our results show that both Young’s modulus and Poisson’s ratio of the monolayer [Formula: see text] exhibit anisotropic behaviors. From the bulk to the monolayer structure, the direct bandgap increases from 2.496 eV to 3.030 eV. Compared to the bulk structure, the monolayer [Formula: see text] exhibits the small average effective mass and significant anisotropy in optical absorption, indicating potential optoelectronic applications.

scholarly journals The Possibility of Beta decay in the Atmospheres of Nuclei of Planetary Nebulae

1968 ◽  
Vol 34 ◽  
pp. 332-338
Author(s):  
G.A. Gurzadian
Keyword(s):  
Beta Decay ◽  
Planetary Nebulae ◽  
Short Wave ◽  
Relativistic Electrons ◽  
Radio Radiation ◽  
High Energies ◽  
Strong Deviation ◽  
Stationary Objects ◽  
Wave Region ◽  
Short Wave Region

At present there is some basis for questioning the usual presentation of the nuclei of planetary nebulae as being ordinary stars. If the quantity of mass released by a star during its formation or at some stage of its evolution serves as a criterion for its not being stationary, then the nuclei of planetary nebulae are hardly the most non-stationary objects. A strong deviation from Planck's radiation law may also serve as a criterion for non-stationarity when the deviation occurs in the far short-wave region of the spectrum in nuclei and similar objects (e.g. stars of Wolf-Rayet which are not nuclei of planetary nebulae). Finally, the existence of synchrotron radio radiation in some planetary nebulae must be explained by the exceptional activity of their nuclei. It would seem that the nuclei of these nebulae are suppliers if not of typical relativistic electrons then at least of electrons with high energies.

The Effect of Anisotropic Surface Tension on Directional Solidification in the Extremely Short Wave Region

2011 ◽  
Vol 365 ◽  
pp. 130-134
Author(s):  
Ming Wen Chen ◽  
Xin Feng Wang ◽  
Yan Lin Wang ◽  
Zi Dong Wang
Keyword(s):  
Surface Tension ◽  
Expansion Method ◽  
Short Wave ◽  
Planar Interface ◽  
Morphological Stability ◽  
Tension Parameter ◽  
Anisotropic Surface ◽  
Wave Region ◽  
Short Wave Region ◽  
Perturbation Growth

The morphologicalstability of a planar interface with the inclusion of the anisotropic surface tension is studied. The dispersion relation is obtained by means of the multi-variable expansion method. The result shows that the morphological stability of the solidification system in the extremely short wave region depends on the undercooling. As the anisotropic surface tension parameter increases the perturbation growth rate of the interface increases and the solidification system in the extremely short-wave region tends to destabilize.

scholarly journals Квазимолекулярные оптические переходы вблизи резонансных линий атомов Kr и Xe в атмосфере гелия

2020 ◽  
Vol 128 (2) ◽  
pp. 171
Author(s):  
А.З. Девдариани ◽  
А.Л. Загребин ◽  
М.Г. Леднев
Keyword(s):  
Potential Energy ◽  
Excited States ◽  
Theoretical Study ◽  
Short Wave ◽  
Potential Energy Curves ◽  
Hamiltonian Method ◽  
Equilibrium Conditions ◽  
Spectral Profiles ◽  
Wave Region ◽  
Short Wave Region

A theoretical study of spectral profiles near the Kr and Xe resonance lines of the 1,3P1–1S0 transitions produced in the atmosphere of helium under equilibrium conditions is performed. Potential energy curves for the excited states of the Kr(4p55s)+He and Xe(5p56s)+He quasimolecules are obtained in the framework of the consistent use of the effective Hamiltonian method and the pseudopotential method. For the ground state experimental data are used. Based on quasistatic approach the spectral profiles of the quasimolecular absorption and radiation in the short-wave region of the resonance lines are calculated by applying the potential energy curves obtained. The resulting profiles are compared with experimental ones.

scholarly journals Scintillation materials based on solid solutions ZnSxSe1–x

2018 ◽  
pp. 43-49
Author(s):  
O. G. Trubaieva ◽  
M. A. Chaika ◽  
S. M. Galkin ◽  
A. I. Lalayants ◽  
T. A. Nepokupnaya
Keyword(s):  
Particle Size ◽  
Solid Solutions ◽  
Solid Phase ◽  
Short Wave ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
X Ray ◽  
Al Composite ◽  
Wave Region ◽  
Short Wave Region

Composite materials based on ZnSxSe1–x solid solutions are promising materials for gamma and X-ray detectors. However, influence of compositions and particle size on scintillation properties is unclear, which prevents their application. This paper reports on the complex study of microcrystalline ZnSxSe1–x powdered scintillations, prepared by solid phase synthesis from ZnS and ZnSe initial compounds. ZnSxSe1-x solid solutions were obtained in the range of x from 0.07 to 0.86 and in the following sizes: 200—250, 140—200, 140—80 µm, and less than 80 µm. X-ray diffractions of powder ZnSxSe1–x shows formation of a cubic lattice of sphalerite structure. ZnSxSe1–x powders demonstrate a presence of a luminescence band in the 590—615 nm regions, while an increase in sulfur concentration leads to a shift of the maximum intensity of X-ray induced luminescence to the short-wave region, which is associated with an increase of the band gap width. The best parameters of X-ray induced luminescence are obtained for the solid solution with 39 at.% of sulfur. The ZnS0,39Se0,61 solid solutions obtained under these conditions have an X-ray induced luminescence intensity that is 4 times higher than that of ZnSe(Al) single crystal and a relatively low level of afterglow. In ZnSxSe1–x solid solutions, increasing of particle size leads to shifts of the X-ray induced luminescence to the longwave region. The highest intensity of the X-ray induced luminescence corresponds to the ZnS0,39Se0,61 composition with the particle size of less than 80 µm. Also, ZnS0,39Se0,61 solid solutions, with particle size less than 80 microns, are more homogeneous in composition, which is why the process of solid phase reaction in them passes more efficiently. It is shown that the ZnSxSe1-x composite scintillators can be used as gamma and X-ray detectors. It has been established that the effectiveness of these materials depends on their composition. ZnS0,5Se0,5 and ZnS0,39Se0,61 composites demonstrate the best scintillation characteristics, with twice as high an efficiency as that of the «commercial» ZnSe(Al) composite.

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