scholarly journals Theoretical study of spectral responses of heterojunctions based on CuInSe2 and CuInS2

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
E. Keita ◽  
B. Ndiaye ◽  
M. Dia ◽  
Y. Tabar ◽  
C. Sene ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Diffusion Length ◽  
Energy Band Diagram ◽  
Band Diagram ◽  
Base Thickness ◽  
Material Models ◽  
Layer Structures ◽  
Recombination Velocity ◽  
Theoretical Results ◽  
Spectral Responses

In this work we study the spectral responses of thin films solar cells of heterojunctions based on CuInSe2 and CuInS2. Four-layer structures are studied according to the n+n/pp+ model. First we consider the structure ZnO(n+)/CdS(n)/CuInS2(p)/CuInSe2(p+) where CuInS2 represent the base and CuInSe2 the substrate in this model. Secondly we consider the structure ZnO(n+)/CdS(n)/CuInSe2(p)/ CuInS2(p+), for this model CuInSe2 represent the base and CuInS2 the substrate. ZnO and CdS are used as window layers in each structure. Using the continuity equation that governs transport of carriers in semiconductor material, models for calculating spectral responses are proposed for heterojunctions type n+n/pp+ based on CuInSe2 and CuInS2. For each structure we have presented the energy band diagram based on the Anderson model [1] and determined the expression of the photocurrent. The theoretical results obtained allow to compare the performances of these two models by optimizing the different parameters of each structure (base thickness, diffusion length, recombination velocity at the interface, etc.) in order to improve the overall efficiency of the collection of carriers.

Explanation of the Influence of Inflow Air Content on the Lift of Cavitating Hydrofoils

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Eduard Amromin
Keyword(s):  
Experimental Data ◽  
Theoretical Study ◽  
Lift Coefficient ◽  
Cavity Surface ◽  
Air Bubbles ◽  
Incoming Flow ◽  
Fluid Density ◽  
Air Content ◽  
Theoretical Results ◽  
Good Agreement

According to several known experiments, an increase of the incoming flow air content can increase the hydrofoil lift coefficient. The presented theoretical study shows that such increase is associated with the decrease of the fluid density at the cavity surface. This decrease is caused by entrainment of air bubbles to the cavity from the surrounding flow. The theoretical results based on such explanation are in a good agreement with the earlier published experimental data for NACA0015.

scholarly journals Theoretical Study of the Reaction of Formation of Some Free Phosphines by Stereoselective Hydrophosphination through DFT Method

2018 ◽  
pp. 1-10
Author(s):  
Kouadio Valery Bohoussou ◽  
Anoubilé Bénié ◽  
Mamadou Guy-Richard Koné ◽  
N’guessan Yao Silvère Diki ◽  
Kafoumba Bamba ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Chemical Reactivity ◽  
Dft Method ◽  
Trans Form ◽  
Dft Methods ◽  
Activation Barriers ◽  
Reactivity Descriptors ◽  
Chemical Reactivity Descriptors ◽  
Theoretical Results ◽  
Cis Isomer

In this work the formation of vinylphosphines was studied through the hydrophosphination reaction. The study aims to rationalize the stereoselectivity of these compounds using quantum DFT methods. This theoretical study of chemical reactivity was conducted at B3LYP/6-311 + G (d, p) level. Global chemical reactivity descriptors, stationary point energies and activation barriers were examined to foretell the relative stability of the stereoisomers formed. The various results obtained have revealed that the addition of arylphosphine to dihalogenoacetylene is stereospecific. The Trans form of vinylphosphines is more stable than the Cis form, when the substituent on phosphorus generates less or no π-conjugations. On the other hand, the Cis isomer is predominant when the aryl radical favors more π-conjugations. The theoretical results obtained are in agreement with the experimental results.

scholarly journals Energy band diagram of In2O3/ Si heterojunction

2011 ◽  
Vol 8 (2) ◽  
pp. 581-587
Author(s):  
Baghdad Science Journal
Keyword(s):  
Energy Band ◽  
Energy Band Diagram ◽  
Band Diagram ◽  
X Ray Diffraction ◽  
Flash Evaporation ◽  
Tunneling Diode ◽  
Conductivity Increase ◽  
Hall Effect Measurements ◽  
Evaporation Technique ◽  
P Type

Crystalline In2O3 Thin films have been prepared by flash evaporation. We have studied the crystal structure of as deposited at 303K and annealed at 523K using X-ray diffraction. The Hall Effect measurements confirmed that electrons were predominant charges in the conduction process (i.e n-type).It is found that the absorption coefficient of the prepared films decreases with increasing Ta. The d.c conductivity study showed that the conductivity increase with increasing Ta , whereas the activation energy decreases with increasing Ta. Also we study the barrier tunneling diode for In2O3/Si heterostructure grown by Flash evaporation technique. (capacitance-voltage C-V) spectroscopy measurements were performed at 303 K and at the annealing temperature 523K. The built in voltage has been determined and it depends strongly on the annealing process of the heterojunction. From all above measurements we assumed an energy band diagram for In2O3 /Si(P-type) heterojunction.

scholarly journals Исследование механизмов токопрохождения в гетероструктуре CdS/por-Si/p-Si

2018 ◽  
Vol 52 (7) ◽  
pp. 751
Author(s):  
В.В. Трегулов ◽  
В.Г. Литвинов ◽  
А.В. Ермачихин
Keyword(s):  
Current Flow ◽  
Energy Band Diagram ◽  
Band Diagram ◽  
Current Voltage Characteristic ◽  
Semiconductor Heterostructure ◽  
Current Voltage ◽  
Recombination Processes ◽  
Flow Mechanisms ◽  
Carrier Tunneling ◽  
Space Charge Limited Currents

AbstractThe temperature dependence of the forward and reverse portions of the current–voltage characteristic and the photovoltage spectrum of a CdS/ por -Si/ p -Si semiconductor heterostructure are studied. It is found that the current-flow mechanisms are controlled by generation–recombination processes in the spacecharge region of the por -Si/ p -Si heterojunction, carrier tunneling in the por -Si film, and the model of space-charge-limited currents. A simplified version of the energy-band diagram of the heterostructure under study is proposed.

Investigation of Endochronic Constitutive Equation Subject to Plastic Strain-Controlled Axial-Torsional Deformation

1986 ◽  
Vol 108 (3) ◽  
pp. 262-269 ◽  
Author(s):  
Han C. Wu ◽  
J. C. Yao ◽  
S. C. Chu
Keyword(s):  
Plastic Strain ◽  
Theoretical Study ◽  
Test System ◽  
Torsional Deformation ◽  
Endochronic Theory ◽  
Phase Path ◽  
Strain Paths ◽  
Theoretical Results ◽  
Material Test System ◽  
Good Agreement

Plastic-strain controlled test is investigated both experimentally and theoretically. The plastic-strain control is feasible by means of computer-aided material test system. Theoretical study is made by use of the modified endochronic theory in which plastic strain is employed to define intrinsic time. Three in-phase plastic-strain paths (a pure axial path, a pure torsional path and an axial-torsional in-phase path) and two out-of-phase plastic-strain paths (small and large perturbations from the axial-torsional in-phase path) are studied. It is shown that the theory and experiment have good agreement. Furthermore, both experimental and theoretical results show that strain-hardening is enhanced by out-of-phase loading.

Cadmium metavanadate mixed oxide nanorods for the chemiresistive detection of methane molecules

2020 ◽  
Vol 44 (29) ◽  
pp. 12473-12485 ◽  
Author(s):  
Veena Mounasamy ◽  
Ganesh Kumar Mani ◽  
Dhivya Ponnusamy ◽  
Kazuyoshi Tsuchiya ◽  
P. R. Reshma ◽  
...  
Keyword(s):  
Thin Film ◽  
Mixed Oxide ◽  
Energy Band ◽  
Gas Sensing ◽  
Energy Band Diagram ◽  
Band Diagram ◽  
Band Bending ◽  
Sensing Mechanism ◽  
Oxide Nanorods

An energy band diagram of the V2O5–CdO thin film and illustration of the methane (CH4) gas sensing mechanism with band bending.

MoSe2/graphene/6H-SiC heterojunctions: energy band diagram and photodegradation

2019 ◽  
Vol 34 (12) ◽  
pp. 125007 ◽  
Author(s):  
B R Borodin ◽  
F A Benimetskiy ◽  
M S Dunaevskiy ◽  
V A Sharov ◽  
A N Smirnov ◽  
...  
Keyword(s):  
Energy Band ◽  
Energy Band Diagram ◽  
Band Diagram
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