scholarly journals EFFECT OF THICKNESS ON THE STRUCTURE AND OPTICAL PROPERTIES OF LASER-INDUCED PLASMA CDO THIN FILMS

2021 ◽  
Vol 03 (03) ◽  
pp. 41-50
Author(s):  
Hiyam Ch. MAJED
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Plasma Deposition ◽  
Cadmium Oxide ◽  
Laser Wavelength ◽  
Dielectric Constants ◽  
Laser Induced Plasma ◽  
Glass Substrates ◽  
Cdo Thin Films

Thin films of cadmium oxide (CdO) deposited on glass substrates using Nd-YAG laser wavelength (alpha= 532 nm) and period time (10ns) via laser-induced plasma deposition technique (PLD). The structural properties of these films have been described as a change in thickness (200 , 400 ,and 1000) nm) at substrate temperature of (400 ° C) and energy flounce of (0.4 J / cm2). The X-ray diffraction results show that he mean size of crystallite measured using Scherer formula to adjust the thickness of 200 nm, 400 nm and 1000 nm of CdO thin films is 47 nm, 64 nm and 78 nm respectively .Also the optical properties which included transmittance, absorbance , energy gap and optical constant such as the Refractive index, extinction coefficient real and imaginary parts of dielectric constants were determined .

scholarly journals Effects of Non-Thermal Argon Plasma Produced at Atmospheric Pressure on the Optical Properties of CdO Thin Films

2018 ◽  
Vol 15 (2) ◽  
pp. 221-226
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Extinction Coefficient ◽  
Energy Gap ◽  
Cadmium Oxide ◽  
Argon Plasma ◽  
Chemical Spray Pyrolysis ◽  
Cdo Thin Films

In this paper the effect of nonthermal atmospheric argon plasma on the optical properties of the cadmium oxide CdO thin films prepared by chemical spray pyrolysis was studied. The prepared films were exposed to different time intervals (0, 5, 10, 15, 20) min. For every sample, the transmittance, Absorbance, absorption coefficient, energy gap, extinction coefficient and dielectric constant were studied. It is found that the transmittance and the energy gap increased with exposure time, and absorption. Absorption coefficient, extinction coefficient, dielectric constant decreased with time of exposure to the argon plasma

scholarly journals Effect of CO2 Laser Irradiation on the Topographic and Optical Properties of CdO Thin Films

2020 ◽  
Vol 17 (1(Suppl.)) ◽  
pp. 0318
Author(s):  
Sahar Naji Rashid et al.
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Laser Irradiation ◽  
Co2 Laser ◽  
Energy Gap ◽  
Wave Length ◽  
Cadmium Oxide ◽  
Atomic Force ◽  
Laser Effect ◽  
Cdo Thin Films

     In this study, cadmium oxide (CdO) was deposited on glass bases by thermal chemical spraying technique at three concentrations (0.05, 0.1, 0.15) M and then was irradiated by CO2 laser with 10.6 μm wave length and 1W power. The results of the atomic force microscope AFM test showed that the surfaces of these CdO thin films were homogenous and that the laser irradiated effect resulted in decreasing the roughness of the surface as well as the heights of the granular peaks, indicating a greater uniformity and homogeneity of the surfaces. The optical properties were studied to determine laser effect. The results of optical tests of these thin films showed that the photoluminescence spectra and absorption shifted towards longer wavelengths with increased concentration, and the transmittance was high at high wave lengths. There was a decrease of energy gap values at (0.05, 0.15)M concentrations which were (2.1, 2.25)eV receptively, and an increase in the energy gap value at 0.1 M  concentration which was 2.55 eV, and other optical properties have been studied in this paper .In general, we observe that the values ​​of the optical constants of the concentrations (0.05, 0.15)M increase after laser irradiation and are lesser after irradiation at concentration 0.1 M.

scholarly journals Laser induced plasma of cadmium oxide: structural, morphological and optical properties

2021 ◽  
Vol 2114 (1) ◽  
pp. 012012
Author(s):  
Tamara S. Hussein ◽  
Ala F. Ahmed
Keyword(s):  
Optical Properties ◽  
Energy Gap ◽  
Cadmium Oxide ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Optical Energy Gap ◽  
X Ray ◽  
Laser Induced Plasma ◽  
Atomic Force ◽  
Doping Ratio

Abstract In this study, the effect of grafting with Iron (Fe) ratios (0.1, 0.3 and 0.5) on the structural and optical properties of cadmium oxide films (CdO) was studied, as these films were prepared on glass bases using the method of pulse laser deposition (PLD). The crystallization nature of the prepared films was examined by X-ray diffraction technique (XRD), which showed that the synthesis of the prepared films is polycrystalline, and Atomic Force Microscope (AFM) images also showed that the increased vaccination with Iron led to an increase in the crustal size ratio and a decrease in surface roughness, The absorption coefficient was calculated and the optical energy gap for the prepared thin films. It was found the absorption decreases and the energy gap decreases with the increase of doping ratio.

SPECTROSCOPIC ELLIPSOMETRY INVESTIGATION ON OPTICAL PROPERTIES OF Fe:SNO2 THIN FILMS: EFFECTS OF IRON CONCENTRATION

2020 ◽  
pp. 2050044
Author(s):  
SAHAR MORADI ◽  
HASSAN SEDGHI
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spectroscopic Ellipsometry ◽  
Sol Gel ◽  
Iron Concentration ◽  
Dielectric Constants ◽  
Bandgap Energy ◽  
Dispersion Parameters ◽  
Glass Substrates ◽  
Coating Method

Nanostructured Fe:SnO2 thin films were deposited on glass substrates through sol–gel spin coating method. Films were synthesized with different iron quantities including 0%, 4%, 8% and 12% (wt.%). The effects of Fe concentration on optical properties of films were investigated by spectroscopic ellipsometry (SE) technique. SE measured ([Formula: see text]) parameters for films in the wavelength range between 300[Formula: see text]nm to 800[Formula: see text]nm. Optical properties including the refractive index, extinction coefficient, transmittance, dielectric constants and optical conductivity were determined by fitting the SE measured ([Formula: see text]) parameters and data obtained from the optical model-based analysis. Results showed that the transmittance values increase by increment of Fe concentration from 0% to 12%. The bandgap energy ([Formula: see text] of prepared thin films was also calculated. [Formula: see text] values were between 3.44 and 3.58[Formula: see text]eV. Dispersion parameters including the high frequency dielectric constant ([Formula: see text] and the ratio of free carrier concentration to effective mass (N/m[Formula: see text] were then obtained for the prepared films.

Enhancing resistive-type hydrogen gas sensing properties of cadmium oxide thin films by copper doping

2018 ◽  
Vol 42 (2) ◽  
pp. 1457-1466 ◽  
Author(s):  
K. Sankarasubramanian ◽  
P. Soundarrajan ◽  
T. Logu ◽  
K. Sethuraman ◽  
K. Ramamurthi
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Spray Pyrolysis Technique ◽  
Cadmium Oxide ◽  
Hydrogen Gas ◽  
Chemical Spray Pyrolysis ◽  
Glass Substrates ◽  
Gas Sensing Properties ◽  
Amorphous Glass ◽  
Cdo Thin Films

The pure and Cu-doped CdO thin films with various doping concentrations (0.5 to 2 wt%) were deposited on amorphous glass substrates by a chemical spray pyrolysis technique for hydrogen gas sensor application.

scholarly journals Impact of CNT Concentrations on Structural, Morphological and Optical Properties of ZnO: CNT Nano composite Films

2021 ◽  
Vol 2114 (1) ◽  
pp. 012020
Author(s):  
A.S. Abd - Alsada ◽  
M. F. A. Alias
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Optical Properties ◽  
Energy Gap ◽  
Hexagonal Phase ◽  
Composite Films ◽  
Nano Composite ◽  
Glass Substrates ◽  
Crystallite Sizes ◽  
The Impact

Abstract In this study, zinc oxide: carbon nanotube (ZnO: CNT) nano composite films with varying CNT concentrations (0,3,5,10, and 15) wt percent were generated utilizing the pulsed laser deposition (PLD) procedure on clean glass substrates at room temperature. The impact of CNT concentration on the structural, morphological, and optical features of ZnO: CNT nano thin films as deposited was examined. X-ray diffraction was used to evaluate the structure of the generated ZnO: CNT thin films, while an atomic force microscope was used to explore the morphological features of the nano films (AFM) and field emission scan electron microscopy (FESEM). The optical properties of prepared thin films were characterized and studied using UV-VIS-NIR spectrophotometer. The structures of prepared ZnO: CNT with different concentration of CNT thin films were polycrystalline. ZnO: CNT nano thin films were synthesized in hexagonal phase and the dominate orientation is (101). The crystallite sizes are 32 and 26 nm for (101) and (100)) planes for ZnO and ZnO: 15% CNT nano films respectively. These crystallite size are decreased with increasing CNT (0, 3,5,10 and 15) wt. %. The lowest grain size can be shown for ZnO, while the largest grain size can be seen in ZnO: CNT nano thin with 15% concentration, whereas FESEM micrographs displayed a typically rough, pronounced microstructure, with surface protrusions. The energy gap (Eg) of ZnO: CNT nano thin film with various concentrations is computed. The result analysis shows that Eg decreased with increasing CNT weight concentration. This type of behaviors make the prepared films are good candidate for broad range of applications such as optoelectronic and display devices.

scholarly journals Annealing Effects on the Interband Transition and Optical Constants of Cobalt Doped Cadmium Oxide Thin Films

2015 ◽  
Vol 43 ◽  
pp. 81-90 ◽  
Author(s):  
Nadir F. Habubi
Keyword(s):  
Thin Films ◽  
Optical Constants ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Interband Transition ◽  
Cadmium Oxide ◽  
Spray Pyrolysis Method ◽  
Optical Parameters ◽  
Annealing Effects ◽  
Cdo Thin Films

The CdO: Co films have been deposited on substrate temperature at 400 °C by spray pyrolysis method using cadmium chloride and cobalt chloride as a precursors for Cd and Co ions, respectively. The effect of annealing temperature on optical constants of Co: CdO thin films are investigated using UV-Visible spectrophotometer in the range of (300-900) nm at room temperature. The absorbance and optical parameters such as α, n, ε1, ε2, and χ are increased when the annealing temperature increases, while the energy gap decreased from 2.5 eV before annealing to 2.48 eV after 500 °C annealing temperature. Urbach energy is increased with the increasing of annealing temperature from 353 meV for sample before annealing to 715 meV for the same samples annealed at 500 °C.

scholarly journals "Effect Of Thermal Annealing On The Optical Properties Of Thin Films Of Polymer Blend (PMMA:PVC:PS) "

2018 ◽  
Vol 5 (1) ◽  
pp. 1-7
Author(s):  
Ali N. Sabbar ◽  
Karar M. Talib ◽  
Hassan T. Badh
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Optical Properties ◽  
Thermal Annealing ◽  
Polymer Blend ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Weather Conditions ◽  
Dielectric Constants ◽  
Casting Technique

"In this paper, we report upon preparation and optical properties of the polymer blend (50%PMMA:25%PVC:25%PS) thin films. The thin films have been prepared with specific ratios using the casting technique at normal weather conditions. The films were subjected to heat treatment in varying temperatures for three hours. The results showed that increase thermal annealing temperature leads to decrease values of the direct and indirect energy gap, but increase the extinction coefficient and optical conductivity. The refractive index, real and imaginary dielectric constants showed a heterogeneous behaviour. Thermal annealing by 80 oC and up leads to deformation the thin films.

INFLUENCE OF ROTATION RATE ON OPTICAL PROPERTIES OF ZnS THIN FILMS ANALYZED BY SPECTROSCOPIC ELLIPSOMETRY METHOD

2019 ◽  
Vol 27 (01) ◽  
pp. 1950092
Author(s):  
BATOOL AHMADI KHANEGAHI ◽  
HASSAN SEDGHI
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spectroscopic Ellipsometry ◽  
Energy Gap ◽  
Incidence Angle ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Glass Substrates ◽  
Rotation Rates ◽  
Zns Films

In the present work, zinc sulfide thin films were deposited on glass substrates by sol–gel process with different coating speeds 3600, 4800, 6000 and 7200[Formula: see text]rpm. Zinc acetate (Zn(CH3COO)[Formula: see text]H2O) and thiourea (CH4N2S) were used as precursors. Two-methoxyethanol and monoethanolamine were used as solvent and stabilizer, respectively. The optical properties of ZnS thin films such as refractive index, extinction coefficient, dielectric function and optical band gap energy of the films were obtained by spectroscopic ellipsometry (SE) analysis method in the wavelength range of 300–800[Formula: see text]nm. The incidence angle of the layers was kept at 70∘. The measured SE parameters [Formula: see text] and [Formula: see text] are fitted against the designed model by minimizing the mean square error (MSE). Considering the data obtained, it can be deduced that the optical properties of ZnS films are highly influenced by rotation rates. The extinction coefficients of the films were increased with increasing rotation rates of the films. From these results, it is found that the energy gap of the ZnS films increases with increasing rotation rates of the films in the range of 3.13–3.20[Formula: see text]eV.

Structural and Optical Properties of PbI2 Thin Films to Fabricate Perovskite Solar Cells

2020 ◽  
Vol 398 ◽  
pp. 140-146
Author(s):  
Kawther A. Khalaph ◽  
Zainab J. Shanan ◽  
Aqel Mashot Jafar ◽  
Falah Mustafa Al-Attar
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
Structural And Optical Properties ◽  
Solar Cell Application ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force

Recently, lead iodide is the most materials employment in the perovskite solar cell application. This paper has studied the character of preparation, structural and optical properties of pbI2 materials. Structural properties are included investigation of the measurements X-Ray Diffraction (XRD), Scan Electron Microscopy (SEM), Fourier Transform InfraRed spectroscopy (FTIR) and Atomic Force Microscopy (AFM) tests to the PbI2 thin films samples. Optical properties are included the investigation UV-Vis test of the thin film samples deposited on glass substrates and investigated the Absorption, Transmittance and evaluated energy gap (Eg = 2.3 eV).

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