Khudheir A. Mishjil

Al-Mustansiriya University · Department of Physics

The performance of first principles computations of nanostructured CdO and Cdo:Mg grown by spray pyrolysis method (SPM) was studied, using density functional theory (DFT)). The structural and optical behaviour with XRD and ultraviolet visible spectroscopy. DFT displayed that Cd 32 O 32 cluster and doped magnesium have cubic with rock salt structure...

Mixed dielectric films of ZnS and MgF 2 have been modeled in IR (3μm) band to reduce a reflectance from ZnS substrate which is around 14%. Reflectance value are enhanced starting from a mixed quarter single layer, double and triple layer as innermost and intermediate layers (quarter-quarter-quarter) and (quarter-half –quarter) ARC’s. The designed l...

Nanostructured ZnO and Cd doped ZnO were deposited employing spray pyrolysis technique. Atomic force microscope and double beam spectrophotometer were utilized to study the influence of non-thermal plasma on topographical and some optical constants. AFM results indicate that the average diameter was 43.4-68.81 nm before exposure and their values wa...

Undoped ZnO and Cd doped ZnO thin films were deposited utilizing chemical spray pyrolysis. The effects of non-thermal plasma on the structural and optical properties were studied. XRD patterns indicate that all the deposited films were polycrystalline hexagonal structure , but the preferred orientation of un doped ZnO was (002), while for doped sam...

Spray pyrolysis technique (SPT) was applied to fabricate CdO films doped with tin at (0–8%) concentrations on glass substrates. Structural, morphological, and optical behaviors were inspected using X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–Vis spectroscopy. Structural, electronic, and optical behaviors of Cd1−xOSnx alloys...

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In this paper, nanocrystalline porous silicon (PSi) films were prepared by electrochemical etching of p-type and n-type silicon wafer respectively with current density 10 mA/cm2 and etching time around (15min). The preparation of nanoparticles of titanium dioxide was done by a chemical method and deposited by drop casting. Solar cells parameters in...

Thin films of fluorine doped nanostructured SnO2 were deposited on quartz glass and single crystal p-n silicon solar cell wafer by chemical spray pyrolysis. XRD measurements reveal that the synthesized films were polycrystalline in nature and showed preferred orientation along (110) plane. The average grain size of films was increased after doping....

In the present work ,design and analysis of the complete omnidirectional Bragg reflector are described. Transfer matrix method (TMM) was adopted to study the unique direction spectral performance of this structure for application in the infrared spectral region (8-14µm).It was shown that omnidirectional 1D- photonic bandgap could be simply evaluate...

In the present work ,design and analysis of the complete omnidirectional Bragg reflector are described. Transfer matrix method (TMM) was adopted to study the unique direction spectral performance of this structure for application in the infrared spectral region (8-14μm).It was shown that omnidirectional 1D- photonic bandgap could be simply evaluate...

Transmission of laser optical elements has been increased when Indium tin oxide (ITO) thin film of relatively high index with different content of Sn was used to prepare ultra thin antireflection coating(ARC's) utilizing simple, low cost non-vacuum chemical spray pyrolysis technique. Two plans were established to achieve the goal: theoretical trans...

Titanium dioxide (TiO2) thin film prepared in a simple chemical method, on an optically flat a glass substrate. The effect of the annealing temperature on a structural and the optical properties of TiO2 films is studied systematically by X-ray diffraction (XRD), Atomic Force Microscopy (AFM), UV–VIS spectroscopy . The XRD patterns show that the dep...

In this paper, the nanocrystalline porous silicon (PSi) films are prepared by electrochemical etching of p-type silicon wafer with current density 7 mA/cm 2 and etching times on the formation nano-sized pore array with a dimension of around different etching time. The films were characterized by the measurement of XRD, FTIR spectroscopy and atomic...

الحمد لله رب العالمين والصلاة والسلام على أشرف المرسلين محمد بن عبد الله عليه وعلى اله أفضل صلاة وأتم تسليم ((الحمــد لله الذي يسر لنا تمـام ما بدانـــــا بـه، ومن يستحق الحمـــد سواه)) يكتسب مختبر الكهربائية والمغناطيسية أهميته في إن قوانين الكهربائية والمغناطيسية تمتلك تحكما مركزيا في تشغيل الأجهزة الكهربائية كالتلفاز والمحركات الكهربائية والحاسب...

In the present work ,design and analysis of the complete omnidirectional Bragg reflector are described. Transfer matrix method (TMM) was adopted to study the unique direction spectral performance of this structure for application in the infrared spectral region (8-14µm).It was shown that omnidirectional 1D- photonic bandgap could be simply evaluate...

In this paper, the determination of specific activity concentrations in nine building materials samples for (3) kinds (brick, gravel and sand) obtained from different Iraqi governarates by using NaI(Tl) scintillation detector was performed. The results of measurements have shown that the specific activity concentrations for 238U, 232Th and 40K were...

FeCl 3 was used as a source of Fe that added to the PVA films. PVA-Fe films were prepared by casting method. The UV-Visible spectrophotometer used to record the absorbance spectrum in the range of 300-900 nm. The absorbance decreased with the increasing of Fe in the PVA films. The absorption coefficient increased with the increasing of Fe content,...

In this paper, the determination of specific activity concentrations in ten commercial cement samples from different countries (Egypt, Iraq, Iran, Jordan, Lebanon, and Turkey) were carried out using NaI(Tl) scintillation detector. The results of measurements have shown that the specific activity concentrations for ²³⁸U, ²³²Th and ⁴⁰K were found to...

In this research, ZnO nanostructure have been prepared from colloidal ZnO nanoparticles NPs utilizing chemical method. The structural, morphological and optical of ZnO thin film has been studied. XRD anaylsis assure that the ZnO thin film were of wurtzite hexagonal crystal structure. AFM investigations showed that the produced ZnO particles have ba...

Undoped Zinc Oxide and Indium doped Zinc Oxide with different doping percentage (1-7 step 2) % have been deposited on a glass substrates at a substrate temperature of (400 ͦ C). The thickness of the deposited films found to around (300±25) nm. The optical properties were achieved by recording absorbance and transmittance in the wavelengths range (4...

Polycrystalline thin film of undoped and Al-doped ZnO have been obtained by chemical spray pyrolysis method. The microstructure and morphological surface were studied by X-ray diffraction (XRD) and atomic force microscope (AFM) techniques respectively. The XRD have revealed that all the deposited films were polycrystalline with a hexagonal structur...

Cd0.4 Se0.6 thin films have been prepared on a glass substrate by chemical bath deposition( CBD) technique. AFM and X-ray analysis were utilized to investigate the effect of thickness variation on surface morphology and crystallinty. The optical properties of thin films were also investigated as a function of film thickness, which was noticed to be...

In this investigation, FeS2 thin films were synthesized by spray pyrolysis technique on glass substrates. The films were annealed at 400 ”C and 450”C in air for a period of 1 hour. The optical characterizations of the as deposited and annealed films were carried out using UVVIS transmittance spectroscopy in the wavelength range 400900 nm. The resul...

Thin films of (ZnO)with different temperature and thickness have been prepared by chemical spray pyrolysis technique on glass substrate XRD analysis reveals that all the prepared films were polycrystalline and hexagonal wurtzite with a preferred orientation along (100) plane, accept the films at (500◦C) substrate temperature showed a preferred orie...

Thin films of CdO and 9 % Mg doped CdO doped have been prepared using spray pyrolysis technique. Transmission and absorption spectra were recorded in order to estimate these films. The deposited thin films were exposed to γ - rays. We have studied the transmission, absorptions and absorption coefficient as a function of photon energy before and aft...

Thin films of CdO and 9 % Mg doped CdO doped have been prepared using spray pyrolysis technique. Transmission and absorption spectra were recorded in order to estimate these films. The deposited thin films were exposed to γ - rays. We have studied the transmission, absorptions and absorption coefficient as a function of photon energy before and aft...

Tin dioxide and cobalt doped tin dioxide thin films were prepared using chemical spray pyrolysis. X-ray diffraction study showed that the deposited films exhibited tetragonal structure with (110) plane as the preferred orientation. The AFM study showed that the rms roughness of undoped films reduced from 20.7 to 15.2 nm due to cobalt doping. The re...

In the present work, measurements are presented of the specifi c activities of radionuclides in cancerous samples of human tissues (kidney, breast and colon) that excised from patients living in Baghdad, Basrah and Anbar governorates, by using a gamma-ray spectrometry system (DSA 2000) (with high purity germanium detector), which has 50% effi cienc...

This paper present the computation and analysis of CIE spectral tristimulus values X,Y and Z to estimate impurity ratios in thin film. White light illuminationD65 and 2 º field of view were selected to study color sensation and color matching of SnO2 thin film doped with various impurity ratios (1,3,5 and 7%) ofCo. Results are displaced as a 1931CI...

Calculation of the electric field intensity of light incident obliquely on a single layer of SnO2 thin-film coating of weakly absorbing material is presented. The analysis utilizes matrix formulas based on Abele's formulas from the calculation of reflectance and transmittance. Partial absorption due to a certain depth in the prepared film...

Thin films of SnO 2 :5%Cu have been prepared on slide glass using chemical spray pyrolysis technique. The optical constants were studied in accordance to the recording of the absorptance and transmittance spectra in range of wavelengths (350-900) nm. The following optical constants have been calculated: (absorption coefficient , Reflectance, extinc...

The effect of impurity concentration ratios on the depth profile of electric field within monolayer film is presented. SnO2 monolayer thin film material was prepared and doped with Co using spray chemical pyrolysis. The concentration ratios of impurity were 1 %, 3 %, 5 % and 7 %. The analysis utilizes matrix formulas based on Abele's formulas from...

We perform a first-principles study to evaluate the structural, electronic and optical properties of GaAs𝑥Sb1−𝑥 ternary and In𝑦Ga1−𝑦As𝑥Sb1−𝑥 quaternary semiconductor alloys up to 𝑥 = 0.5, 𝑦 = 0.5. We employ the Perdew–Burke–Ernzerhof form of the generalized gradient approximation (GGA) within the framework of density functional theory (DFT) by usin...

The influence of copper contents on the structural and optical properties of sprayed SnO2 thin films has been investigated. The surface topography and structural properties of these films were studied by using atomic force microscopy (AFM) and X-ray diffraction techniques. According to the X-ray diffraction spectra, SnO2 and copper doped SnO2 thin...

Long-wave pass edge filter of high transmittance and wide bandpass have been designed and fabricated using on a single weakly absorbed ZnS thin film material of thickness of about 300 nm which was prepared by using the flash evaporation technique. The design was based on characteristic matrix theory, taking into account the effect of dispersion phe...

. – The fi rst experimental fi ndings and estimations of linear, mass absorption coefficients and range of mono-energetic positrons (energy equal to 0.53 MeV) in the solid-state nuclear track detector (BN1) is reported. The results of the present work were compared with the available results of some other (SSNTD's). The present results were also co...

. – The present work presents the experimental study of penetration of mono-energetic positrons through the solid-state nuclear track detector CN-85. The fi rst fi ndings and estimations of mass, linear absorption coeffi cients and range of mono-energetic positrons having energy of 0.53 MeV in this detector are reported. The results of the present...

This paper presents the methodology of the design of W-type antireflection coating of weakly absorption coatings for UV-region at oblique incidence of light for full-wide angle (0-90˚). The design was based on the modified characteristic matrix theory taking into account the effect of absorption and dispersion phenomena for layers and substrate. Th...

Thin films of cuprous oxide Cu2O have been prepared using spray pyrolsis technique. Experimentally, the optical energy gap of Cu2O was about 2.2eV. To achieve and estimate an accurate Eg value, there was problem in the selection of exact tangent point. To overcome this problem, Newton-Raphson method and mean-value theorem were used. It was found th...

Design and preparation of weakly absorbing V-type antireflection coating on ordinary glass as a substrate was studied. The design was based on the modified characteristic matrix theory taking into account the effect of absorption and dispersion phenomena for layers and substrate. Spray pyrolys1s technique was used to prepare durable and adhesive F...

2ffi 5i crtill J&llr. r r. r. r I r. r I I t I I r.. I t r. r. t i t I t t !. I I t I i I I ar# 4# e$. ABSTRACT: Thin films of SnO2:Al have been prepared using spray pyrolysis technique. The efTect of gamma rays on optical properties of these films have been studied. lt was found the "i*ray affected these properties by reducing the value of all the...