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Articles 1 - 30 of 35
Full-Text Articles in Physical Sciences and Mathematics
Effects Of Silar Cycle On The Electrical Characteristics Of Cd/Cdse/N-Si/Au-Sb Structure, Betül Güzeldi̇r, Mustafa Sağlam, Aytünç Ateş
Effects Of Silar Cycle On The Electrical Characteristics Of Cd/Cdse/N-Si/Au-Sb Structure, Betül Güzeldi̇r, Mustafa Sağlam, Aytünç Ateş
Turkish Journal of Physics
Cd/CdSe/n-Si/Au-Sb structures have been fabricated by Successive Ionic Layer Adsorption and Reaction (SILAR) method under various SILAR cycles. The characteristics parameters of these structures such as barrier height, ideality factor, series resistance are calculated from the current-voltage (I-V) measurements and the barrier height, carrier concentration are calculated from reverse bias capacitance-voltage (C-V) measurements at 300 kHz frequency and room temperature. Furthermore, the density distribution and rectifying ratio of these structure have been calculated from the I-V measurements as a function of SILAR cycle. It has been seen that the changes of characteristic parameters such as barrier height, ideality factor and …
Effect Of Nitrogen Incorporation On The Electronic And Optical Properties Of Algaasn/Gaas Quantum Well Lasers, Boualem Merabet, Abdelhadi Lachebi, Hamza Abid
Effect Of Nitrogen Incorporation On The Electronic And Optical Properties Of Algaasn/Gaas Quantum Well Lasers, Boualem Merabet, Abdelhadi Lachebi, Hamza Abid
Turkish Journal of Physics
In order to investigate the profound effect of small amounts of nitrogen incorporated into the III-V systems on the fundamental band gap, which decreases dramatically with increasing of N^+ implantation, we present a pseudopotential formalism within the Virtual Crystal Approximation confronted to the Band Anti-crossing model, which parameterizes successfully such behaviour, so as to study the electronic and optical properties of dilute Al_xGa_{1-x}As_{1-y}N_y materials, prepared by implantation of N^+ into epitaxial AlGaAs. Analytical formulas of quantized energy levels in AlGaAsN quantum well (QW) lasers and optical transition wavelengths between subbands are presented and compared to simulations based on our programs.
The Low Temperature Resistivity Of Thermally Evaporated Antiferromagnetic Mn_{100-X} Ru_X Thin Films, Francis Kofi Ampong, Francis Boakye
The Low Temperature Resistivity Of Thermally Evaporated Antiferromagnetic Mn_{100-X} Ru_X Thin Films, Francis Kofi Ampong, Francis Boakye
Turkish Journal of Physics
Electrical resistivity measurements on thermally evaporated Mn_{100-x} Ru_x thin films (with x = 0.05 at.% Ru and x = 2.5 at.% Ru) have been carried out over the temperature range from 300 to 1.4 K. A behaviour typical of the bulk \alpha-Mn has been observed on the film with x = 0.05 at.% Ru. The Néel point of this specimen is established at 90 \pm 1 K which is typical of the bulk. This Néel point is raised to 100 \pm 1 K with x = 2.5 at.% Ru in \alpha-Mn. A relatively long range magnetic ordering was observed with …
Comparing Optical Sensing Using Slab Waveguides And Total Internal Reflection Ellipsometry, Sofyan A. Taya, Taher M. El-Agez
Comparing Optical Sensing Using Slab Waveguides And Total Internal Reflection Ellipsometry, Sofyan A. Taya, Taher M. El-Agez
Turkish Journal of Physics
The sensitivity of the effective refractive index of slab waveguide sensors to variations in the refractive index of the cladding is compared to that of the ellipsometric parameters. The changes of the effective refractive index of a waveguide and the ellipsometric parameter \Delta , due to the index change of the cladding, were derived and plotted as a function of the guiding layer thickness and with the index of the cladding. It is found that these changes almost have the same overall feature but the ellipsometric parameters showed considerable higher sensitivity than the effective index of the conventional waveguide optical …
Theoretical Calculation Of Energy Levels Of Pb Iii, Chao Zhou, Jian Jian Cao, Liang Liang, Ling Zhang
Theoretical Calculation Of Energy Levels Of Pb Iii, Chao Zhou, Jian Jian Cao, Liang Liang, Ling Zhang
Turkish Journal of Physics
In this paper, the results of theoretical calculation of five Rydberg series energy levels 5d_{3/2} \to np_{1/2} (n=6--20), 5d_{3/2} \to nf_{5/2} (n=5--20), 5d_{5/2} \to np_{3/2} (n=6--20), 5d_{5/2} \to nf_{7/2} (n=5-20) and 5d_{5/2} \to nf_{5/2} (n=5-20) for Pb III ions are presented using the weakest bound electron potential model (WBEPM) theory, considering foreign level perturbation corrections. The theoretically calculated results agree very well with present known experimental data, and some energy levels without experimental values are predicted.
Nuclear Structure Of Even-Even Ge Isotopes By Means Of Interacting Boson Models, Abdul R. H. Subber
Nuclear Structure Of Even-Even Ge Isotopes By Means Of Interacting Boson Models, Abdul R. H. Subber
Turkish Journal of Physics
Interacting Boson Models IBM-1and IBM-2, have been used to calculate energy levels and nuclear properties of the even-even Ge isotopes from A = 64 to A = 80. Energy levels of the low lying states of these nuclei were produced, the electric quadruple reduced transition probabilities B(E2) were calculated as well. Mixing ratios \delta (E2/M1) for transitions with \Delta I=0, I \ne 0 were calculated. All the results are compared with available experimental data and other IBM versions and calculations. Satisfactory agreements were produced.
Estimating Global Solar Radiation From Common Meteorological Data In Aranjuez, Spain, Javier Almorox
Estimating Global Solar Radiation From Common Meteorological Data In Aranjuez, Spain, Javier Almorox
Turkish Journal of Physics
This study aimed to calibrate existing models and develop a new model for estimating global solar radiation data using commonly and available measured meteorological records such as precipitation or temperature. Fifteen empirical global radiation models based on meteorological variables were generated and validated using daily data in 2003-2008 at the Aranjuez station (Community of Madrid, Spain). Validation criteria included coefficient of determination, root mean square error, mean bias error, mean absolute bias error, mean percentage error, and mean absolute percentage error. The best result was derived from the model proposed, which uses extraterrestrial solar radiation, saturation vapor pressures, transformed rainfall …
Analytical Expression For Mode-Coherence Coefficient Of A Uniformly-Distributed Wave Propagating In Different Homogeneous Media, Noor Ezzulddin Naji
Analytical Expression For Mode-Coherence Coefficient Of A Uniformly-Distributed Wave Propagating In Different Homogeneous Media, Noor Ezzulddin Naji
Turkish Journal of Physics
Presented is a derivation of an analytical expression for the mode-coherence coefficients of uniform-distributed wave propagating within different homogeneous media-as in the case of hyperbolic Gaussian beams-and a simple method involving the superposition of two such beams is proposed. The results obtained from this work are very applicable to study and analysis of Hermite-Gaussian beam propagation, especially in the problems of radiation-matter interaction, and laser beam propagation such as employed in free-space and fiber optical communications.
Dynamical Behavior Of Traveling Wave Solutions For The K(2,2) Equation, Lina Zhang
Dynamical Behavior Of Traveling Wave Solutions For The K(2,2) Equation, Lina Zhang
Turkish Journal of Physics
In this paper, we discuss the qualitative behavior of degenerate singular points for the K(2,2) equation. By analyzing the different dynamical behaviors of the singular system and its associated regular system, we come to the conclusion that for the singular system the smoothness property of its orbits, which have intersection point(s) with the singular straight line, will not be destroyed. Meanwhile, the corresponding smooth traveling wave solutions for the K(2,2) equation are obtained.
Electrons Trajectories In Electromagnetically Pumped Free Electron Laser With A Constant Reverse Guide Magnetic Field, Ahmad Omar
Turkish Journal of Physics
An exact solution to the quartic equation in the wiggler frequency \omega_w, which represents the dispersion relation for this system, is obtained. The effects of the frequency of the wiggler \omega_w on the electron's velocities (v_{\vert \vert} and v_w) are investigated. The regions of interest for the allowed wiggler frequency \omega_w for both group I and group II electron trajectories are discussed.
Hydromagnetic Thermal Boundary Layer Flow Of A Perfectly Conducting Fluid, Kalidas Das
Hydromagnetic Thermal Boundary Layer Flow Of A Perfectly Conducting Fluid, Kalidas Das
Turkish Journal of Physics
Using successive approximation technique, an analysis of unsteady hydromagnetic boundary layer flow with thermal relaxation of perfectly conducting, viscous incompressible fluid past a semi-infinite porous plate in presence of heat absorbing sinks is carried out. The expression for velocity and temperature fields, local skin friction coefficient, local heat transfer coefficient etc have been derived when the free stream velocity exponentially depends on time. The effects of different parameters entering into the problem are shown graphically and discussed numerically.
2n-Dimensional At Fujii Model Instanton-Like Solutions And Coupling Constant's Role Between Instantons With Higher Derivatives, Mehmet Keçeci̇
2n-Dimensional At Fujii Model Instanton-Like Solutions And Coupling Constant's Role Between Instantons With Higher Derivatives, Mehmet Keçeci̇
Turkish Journal of Physics
An instanton-like solution is considered for a class of two-dimensional conformal model with Liouville term. The model expressed here is a new higher-dimensional model with scalar-spinor interaction on even-dimensional spaces, and is a generalization of the even-dimensional Fujii model. A recurrence relation for the Fujii model and coupling constant's indices between relations with interaction constant is extracted. The behavior of Gürsey, Akdeniz-Smailagi' c and Fujii coupling constants in 4-dimensional conformal models are examined.
Metals And Metal Oxides Particles Produced By Pulsed Laser Ablation Under High Vacuum, Khurram Siraj, Yasir Sohail, Aasma Tabassum
Metals And Metal Oxides Particles Produced By Pulsed Laser Ablation Under High Vacuum, Khurram Siraj, Yasir Sohail, Aasma Tabassum
Turkish Journal of Physics
A pulsed KrF Excimer laser (248 nm, 15 mJ) was utilized to synthesize different particles on (111) Si substrate under vacuum \sim 10^{-6} torr using Aluminum (Al), Platinum (Pt), Tungsten (W), Molybdenum (Mo), Cadmium Oxide (CdO), and Yttrium Oxide (Y_2O_3) targets. Scanning electron microscope (SEM) was used to study particle size distribution on silicon substrate. The size of individual metal particles was found to be ranging from 71 nm to 2 \mu m whereas metal oxides particles were found in the range of 71 nm to 1.1 \mu m. The particles below 100 nm are formed by gas phase condensation …
Characteristics Cd_{0.3}Sn_{0.7}Se Thin Films As Absorber Materials For Solar Cell Devices, Salma Mahdi Shaban, Raad Mohammad Saleh, Ahmed Saleh Ahmed
Characteristics Cd_{0.3}Sn_{0.7}Se Thin Films As Absorber Materials For Solar Cell Devices, Salma Mahdi Shaban, Raad Mohammad Saleh, Ahmed Saleh Ahmed
Turkish Journal of Physics
Cadmium Tin Selenide compound Cd_{0.3}Sn_{0.7}Se was prepared by direct reaction of high-purity elemental Cadmium, Tin and selenium. Cd_{0.3}Sn_{0.7}Se thin films were prepared on to well-cleaned glass substrates by vacuum thermal evaporation technique at room temperature of different thicknesses. The X-ray diffraction studies revealed that all the deposited films are amorphous in nature and exhibiting polycrystalline structure when are annealed at 348 K and 373 K. The crystallites were found to have a preferred orientation along the (111) direction. The analysis of its optical characteristics indicated the ability of these films to absorb the visible light due to its graded energy …
Delta Excitation Calculation Studies In The Ground State Of The Compressed Finite Heavy Doubly-Magic Nucleus ^{100}Sn, Mohammed Hassen Eid Abu-Sei'leek
Delta Excitation Calculation Studies In The Ground State Of The Compressed Finite Heavy Doubly-Magic Nucleus ^{100}Sn, Mohammed Hassen Eid Abu-Sei'leek
Turkish Journal of Physics
The energies and matter densities of finite nuclei under radial compression are investigated by using a constrained Hartree-Fock method with the \Delta degree of freedom included. The results are presented for the doubly-magic nucleus ^{100}Sn in an effective baryon-baryon interaction. It is found that as the nucleus is compressed to about three time of the ordinary nuclear density, the \Delta component is sharply increased to about 17% of all baryons in the system. This result is consistent with the values extracted from relativistic heavy-ion collisions. The single particle energy levels calculated and their behaviors under compression examined too. A good …
A 3d Model For Thickness And Diffusion Capacitance Of Emitter-Base Junction Determination In A Bifacial Polycrystalline Solar Cell Under Real Operating Condition, Senghane Mbodji, Babacar Mbow, Fabe Idrissa Barro, Gregoire Sissoko
A 3d Model For Thickness And Diffusion Capacitance Of Emitter-Base Junction Determination In A Bifacial Polycrystalline Solar Cell Under Real Operating Condition, Senghane Mbodji, Babacar Mbow, Fabe Idrissa Barro, Gregoire Sissoko
Turkish Journal of Physics
This paper aims at presenting the behaviour of the space charge region for an n^+-p-p^+ bifacial solar cell under monochromatic illumination. It also deals with mathematical relations in the describing and the use of new approach that involves both junction and back surface recombination velocities with a 3D modelling study. Based on the normalized carriers' density, versus base depth, the space-charge layer thickness (Z_{0,u}) is studied for various parameters such as grain size g, grain boundaries recombination velocity S_{gb}, wavelength \lambda and for different operating conditions. Therefore, the relationship between Z_{0,u} and the diffusion capacitance C_u show that junction in …
Hall Effect On Mhd Forced Convection From An Infinite Porous Plate With Dissipative Heat In A Rotating System, Nazibuddin Ahmed, Jiwan Krishna Goswami
Hall Effect On Mhd Forced Convection From An Infinite Porous Plate With Dissipative Heat In A Rotating System, Nazibuddin Ahmed, Jiwan Krishna Goswami
Turkish Journal of Physics
An attempt has been made to study the Hall effect on MHD forced convection from an infinite horizontal porous plate with dissipative heat in a rotating system with uniform free stream when the temperature at the plate varies periodically with time. The entire system rotates with a constant angular velocity about the normal to the plate. A uniform magnetic field is assumed to be applied along the normal to the plate directed into the fluid region. The governing equations are solved analytically. The expressions for the velocity and temperature field are obtained in non-dimensional form. The skin friction due to …
Molecular Interaction Studies In Binary Mixtures Containing Aniline, Toluene And N-Butanol, Palaniappan Lakshmanan, Mahendran Govindasamy
Molecular Interaction Studies In Binary Mixtures Containing Aniline, Toluene And N-Butanol, Palaniappan Lakshmanan, Mahendran Govindasamy
Turkish Journal of Physics
Ultrasonic velocity and density values have been measured at 303 K in binary mixtures containing aniline, toluene and n-butanol; and the thermodynamical approach is applied to evaluate the mixtures' molar volume, adiabatic compressibility, intermolecular free length and excess values. The observed results are interpreted in terms of molecular interaction between the components of the mixtures. Observed excess values and their fittings of R-K type equations lend further support to the observation made in the binary system.
Stress-Strain Characteristics, Dynamic Recrystallization, Grain Growth, And Melting Point Of The Binary And Ternary Solder Alloys, Shakib Moqbel Ali Mohammed Alsowidy, Mohammed Ali Shukri
Stress-Strain Characteristics, Dynamic Recrystallization, Grain Growth, And Melting Point Of The Binary And Ternary Solder Alloys, Shakib Moqbel Ali Mohammed Alsowidy, Mohammed Ali Shukri
Turkish Journal of Physics
An advanced solder alloy, Pb-10wt%Sn-3wt%Zn, has been developed to improve the mechanical properties of the Pb-10wt%Sn based solders. Deformation behavior of Pb-10wt%Sn and Pb-10wt%Sn-3wt%Zn alloys was investigated in tension at strain rates from 0.005% to 0.25% s^{-1} in the temperature range 383--433 K. The stress-strain characteristics curves showed two deformation modes: (i) continuous work softening and fracture following a sharp stress in Pb-10wt%Sn, (ii) work hardening with steady-state flow and fracture just after yielding in Pb-10wt%Sn-3wt%Zn. In the work softening type, relatively coarse grains ranging from 30 to 60 \mu m are produced by dynamic recrystallization (DRX). In the work …
Optical Characterization Of Fe^{3+} Doped Cds Nanoparticles Synthesized By Wet-Chemical Route, Seyed Mohammad Taheri Otaqsara, Mohammad Hassan Yousefi, Ali Azam Khosravi
Optical Characterization Of Fe^{3+} Doped Cds Nanoparticles Synthesized By Wet-Chemical Route, Seyed Mohammad Taheri Otaqsara, Mohammad Hassan Yousefi, Ali Azam Khosravi
Turkish Journal of Physics
Fe^{3+} doped CdS nanoparticles using Mercaptoethanol as a capping agent were prepared by colloidal wet-chemical method. UV-VIS spectra show that Fe-doping can effectively tune energy band structure, i.e. a large blue shift (\sim 30 nm) with increasing Fe concentration. PL measurement of doped CdS nanoparticles shows an additional emission band at \sim 532 nm, which can be due to radiative transition of dopant level to ground state. X-ray diffraction patterns studies revealed cubic crystal phase. TEM micrographs show a spherical shape and nearly well distribution with an average particle size of \sim 4 nm.
Role Of Metallic Zn And In Additives In The Electrical And Dielectric Properties Of Se_{0.85}Te_{0.15} Glassy Alloy, Jyoti Sharma, Santosh Kumar
Role Of Metallic Zn And In Additives In The Electrical And Dielectric Properties Of Se_{0.85}Te_{0.15} Glassy Alloy, Jyoti Sharma, Santosh Kumar
Turkish Journal of Physics
In this paper we report the effect of metallic Zn and In additives on the electrical and dielectric properties of Se_{0.85}Te_{0.15} glassy system. The temperature and frequency dependence of the dielectric parameters in glassy Se_{0.85}Te_{0.15}, Se_{0.75}Te_{0.15}In_{0.10} and Se_{0.75}Te_{0.15}Zn_{0.10} alloys are studied by measuring capacitance and dissipation factor in the frequency range (1 kHz--5 MHz) and temperature range (300--350 K). Direct current (dc) measurements were also performed in the aforesaid temperature range to assess the dc conduction losses. Results are interpreted in terms of a theoretical model which is based on two electron hopping over a potential barrier and is applicable …
Investigation Of Extremely Low Frequency (Elf) Hot Spots In The College Of Science And Technology, Covenant University, Ota, Marvel Akinyemi, John Kayode, Mojisola Usikalu
Investigation Of Extremely Low Frequency (Elf) Hot Spots In The College Of Science And Technology, Covenant University, Ota, Marvel Akinyemi, John Kayode, Mojisola Usikalu
Turkish Journal of Physics
The presence of Extremely Low Frequency (ELF) from electronic devices such as personal computers, laboratory equipment and television sets in selected laboratories and offices at the College of Science and Technology Building, Covenant University, Ota, Nigeria was characterized using an ELF Detection Meter. The study revealed that exposure to ELF fields could be controlled to the minimum depending on the awareness of the occupant. As with all electromagnetic fields, the ELF field decays rapidly with distance from source or hot spots. The average observed value of ELF in the offices ranged from 3.5 to 5.0 mG. A significant hot spot …
Effective Size And Expansion Energy Of A Bose-Einstein Condensate In A 3d Non-Cubic Optical Lattice, Shemi S. M. Soliman
Effective Size And Expansion Energy Of A Bose-Einstein Condensate In A 3d Non-Cubic Optical Lattice, Shemi S. M. Soliman
Turkish Journal of Physics
This work is devoted to study the temperature dependence of the effective size and expansion energy E_{x,z} of a Bose-Einstein condensate in a 3D non-cubic optical lattice. Correction due to the finite size, interatomic interaction and the deepness of the lattice potential are given simultaneously. The calculated results show that these two parameters increase with the lattice depth or the relative frequency at temperature less than the transition temperature, (T < T_o); yet it has little effect at temperatures higher than the transition temperature (T > T_o). Both the effective size and expansion energy follow a characteristic temperature dependence, i.e. , E \propto(T/T_0)^4 if T < T_0 and , E \propto (T/T_0) if T > T_0. For a 3D non cubic optical potential the effect of …
A Quantum Theory Of The Scattering Of Soft X-Ray From Compton Effect Caused Electron Standing Wave In The Materials, Biswajit Mallick
A Quantum Theory Of The Scattering Of Soft X-Ray From Compton Effect Caused Electron Standing Wave In The Materials, Biswajit Mallick
Turkish Journal of Physics
In the present investigation, low-energy x-rays (
Study Of Differential Cross Section Using Different Bound State Potentials, Ass'ad I. Ass'ad
Study Of Differential Cross Section Using Different Bound State Potentials, Ass'ad I. Ass'ad
Turkish Journal of Physics
In this study, heavy ion reactions of ^6Li + (^{58}Ni, ^{28}Si, ^{12}C) and ^7Li + ^{12}C are studied using different bound state potentials, within the framework of the Distorted Wave Bourn Approximation (DWBA) calculations. Woods-Saxon potential is expressed as the optical potential in the initial and final channels together with a Coulomb potential. The calculations of the angular distributions are found to be in a good agreement with the experimental data. The extracted spectroscopic factors are reasonable.
Resonant Transfer Excitation Followed By X-Ray For Boron-Like Ions, Hassan Ramadan
Resonant Transfer Excitation Followed By X-Ray For Boron-Like Ions, Hassan Ramadan
Turkish Journal of Physics
Theoretical cross sections for resonant transfer excitation followed by x-ray emission (RTEX) are calculated for the collisions of some ions in the series of the Boron-like ions with H_2 as a target. The calculations have been done for C II, N III, O IV, F V, Ar XIV and Fe XXII ions by folding their dielectronic recombination (DR) cross sections over the momentum distribution (Compton profile) of H_2 target gas. Calculations have been performed from both ground and metastable initial states, in LS - coupling, allowing for \triangle n = 0 excitations. In the present work, the RTEX cross sections …
Strong Optical Injection Locked Semiconductor Laser For High Bit Rate Chaotic Optical Communications, Muzahim Ibrahim Azawe, Ragaad Habib Saied
Strong Optical Injection Locked Semiconductor Laser For High Bit Rate Chaotic Optical Communications, Muzahim Ibrahim Azawe, Ragaad Habib Saied
Turkish Journal of Physics
We present in this article how strong optical injection can produce chaotic dynamics in the output of the semiconductor laser that is preferable for perfect encrypted optical communication networks. Significant increase in the relaxation resonance frequency was found implying higher degree of enhancement in modulation bandwidth. Numerical investigations under the condition of strong optical injection locking of the slave laser shows that instabilities in the photon number was observed and had settled down after a time of in the order of carrier lifetime. The model presented can be used to extract the characteristic parameters of the injection locking for detuning …
Influence Of Doping And Heat Treatments On Carriers Mobility In Polycrystalline Silicon Thin Films For Photovoltaic Application, Beddiaf Zaidi, Bouzid Hadjoudja, Houda Felfli, Allaoua Chibani
Influence Of Doping And Heat Treatments On Carriers Mobility In Polycrystalline Silicon Thin Films For Photovoltaic Application, Beddiaf Zaidi, Bouzid Hadjoudja, Houda Felfli, Allaoua Chibani
Turkish Journal of Physics
In this work, we investigate the influence of doping as well as heat treatments on the mobility of the carriers in polycrystalline silicon layers. It was found that any increase in both parameters leads to an increase in the mobility of the carriers. Such mobilities were shown to be higher in boron doped layers that those doped with arsenic. Moreover, for strong arsenic doping, after the initial increase, we observed a saturation region followed by a final decrease of carrier mobility.
Effect Of Cdcl_2/Annealing On The Crystalline Transformation Of Cdte Thin Films Grown By Evaporation At A Low Substrate Temperature, İsmai̇l Polat, Sali̇h Yilmaz, Emi̇n Bacaksiz, Mustafa Altunbaş, Murat Tomaki̇n
Effect Of Cdcl_2/Annealing On The Crystalline Transformation Of Cdte Thin Films Grown By Evaporation At A Low Substrate Temperature, İsmai̇l Polat, Sali̇h Yilmaz, Emi̇n Bacaksiz, Mustafa Altunbaş, Murat Tomaki̇n
Turkish Journal of Physics
The structural and optical properties of CdTe thin films prepared at a low substrate temperature were investigated before and after the CdCl_2/annealing. The crystal structure of CdTe film was cubic with a strong (111) preferential orientation. Annealing at 400 °C without CdCl_2 treatment results in a decrease in the (111) peak intensity while the intensities of the (220), (311) and (331) peaks appeared, indicating that the texture is significantly changed. However, after the CdCl_2/annealing, the film exhibited a hexagonal phase as a dominant structure. The scanning electron microscopy patterns showed that the as-deposited and annealed samples had almost the same …
Electronic Structure Of The Ge And Se Vacancies In Gese Layered Semiconductor, Zakir Jahangirli
Electronic Structure Of The Ge And Se Vacancies In Gese Layered Semiconductor, Zakir Jahangirli
Turkish Journal of Physics
We report the results of a theoretical investigation of electronic properties of ideal cation and anion vacancies in GeSe. The calculations have been performed using self-consistent Green's function method. The bulk electronic structure is described by a tight-binding Hamiltonian in the bases sets of Linear Combinations of Atomic Orbitals (LCAO). The Green's function of the perfect crystal evaluated using an eigenfunction expansion employing wave functions and band structures obtained from a self-consistent, pseudopotential, local-density-functional calculation. The defect potential is calculated using occupied electron states of the perturbed system. Results are obtained in terms of vacancy bound states, vacancy resonances, and …