Effect of the grain size on the structural and optical properties of the sprayed CdxZn1-xS films

2010 ◽  
Author(s):  
M. Oztas ◽  
Z. Ozturk ◽  
M. Bedir ◽  
S. Sur
Keyword(s):  
Grain Size ◽  
Optical Properties ◽  
Structural And Optical Properties

CONTROLLED SYNTHESIS OF THE ZnWO4 NANOSTRUCTURE AND STUDY OF THEIR STRUCTURAL AND OPTICAL PROPERTIES

2012 ◽  
Vol 21 (01) ◽  
pp. 1250002 ◽  
Author(s):  
NGUYEN MANH HUNG ◽  
LAM THI HANG ◽  
NGUYEN VAN KHANH ◽  
DU THI XUAN THAO ◽  
NGUYEN VAN MINH
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Optical Properties ◽  
Reaction Time ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Calcination Time ◽  
Transmission Electron ◽  
Pure Phase ◽  
Size And Morphology

We investigate the effects of calcination time and concentration of solution on the structure, as well as optical properties in ZnWO4 nanopowder prepared by hydrothermal method. The prepared powder were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman scattering, optical absorption and photoluminescent spectroscopy (PL). It is shown that the grain size and morphology of ZnWO4 nanopowder can be controlled by adjusting the reaction time as well as the concentration of the solution. The resultant sample is a pure phase of ZnWO4 without any impurities. The result showed that the optical property of ZnWO4 nanopowders depend on their grain size. The optical band gap becomes narrower as the reaction time or concentration of solution is increased. The improved PL properties of the ZnWO4 crystallites can be obtained with the optimal concentration of the solution.

EFFECT OF SUBSTRATE TEMPERATURE ON THE STRUCTURAL AND OPTICAL PROPERTIES OF NiTsPc THIN FILMS

2019 ◽  
Vol 27 (03) ◽  
pp. 1950124 ◽  
Author(s):  
MOHAMMED YARUB HANI ◽  
ADDNAN H. AL-AARAJIY ◽  
AHMED M. ABDUL-LETTIF
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Optical Properties ◽  
Substrate Temperature ◽  
Energy Gap ◽  
Chemical Spray Pyrolysis ◽  
Structural And Optical Properties ◽  
Absorption Bands ◽  
Tauc Plot ◽  
Substrate Temperatures

Nickel(II) phthalocyanine-tetrasulfonic acid tetrasodium salt (NiTsPc) thin films were deposited on glass substrates at different substrate temperatures ([Formula: see text]) by chemical spray pyrolysis (CSP) technique. The substrate temperature varied from 110∘C to 310∘C in 50∘C steps. The substrate surface temperature is the main parameter that determines the film morphology and properties of the thin films. The structural properties of the deposited NiTsPc thin films were investigated by X-ray diffraction (XRD) and from the obtained results, it was shown that depositing thin films using 210∘C as [Formula: see text] results in higher crystallinity. Atomic force microscope (AFM) was employed to obtain the surface topography and to calculate the roughness and grain size. The smoothest thin film surface was obtained when using at 160∘C, while the highest roughness was obtained at 310∘C. The optical properties were investigated by ultraviolet visible (UV-Vis) spectrophotometer and fluorescence spectrophotometer. From the absorption spectra recorded in the wavelength range 190–1100[Formula: see text]nm, two absorption bands were observed, which are known as Soret and Q-band. By observing the absorption spectrum, it can be concluded that the deposited thin films at 110∘C–310∘C have direct energy gap. From Tauc plot relation, the energy gap ([Formula: see text]) was calculated. The values of the energy gap were between 3.05 and 3.14[Formula: see text]eV. It was observed that different [Formula: see text] highly affects the structural and optical properties of the deposited thin films. The crystallinity, grain size, roughness and the optical properties were strongly affected by the different substrate temperatures.

Single Phase CuO Thin Films Prepared by Thermal Oxidation in Air with Water Vapor

2015 ◽  
Vol 1109 ◽  
pp. 544-548 ◽  
Author(s):  
Jian Bo Liang ◽  
Xu Yang Li ◽  
Naoki Kishi ◽  
Tetsuo Soga
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Optical Properties ◽  
Water Vapor ◽  
Band Gap ◽  
Thermal Oxidation ◽  
Single Phase ◽  
Optical Band Gap ◽  
Structural And Optical Properties ◽  
Oxidation In Air

Single phase CuO films have been successfully synthesized by thermal oxidation of cupper foil in air with water vapor. The structural and optical properties of CuO films were investigated. It is observed that the grain size increases with increasing the oxidation temperature. The optical band gap of CuO film is determined by the transmittance and reflectance spectra.

Deposition and Evaluation of Micro-Crystalline Silicon for Use in Photoconducting Antennas

1998 ◽  
Vol 507 ◽  
Author(s):  
Sripathi Yarasi ◽  
Tajinder Manku
Keyword(s):  
Grain Size ◽  
Optical Properties ◽  
Vapor Deposition ◽  
Crystalline Silicon ◽  
Chemical Vapor ◽  
Dipole Antenna ◽  
Clean Room ◽  
Structural And Optical Properties ◽  
Photoconducting Antennas ◽  
Scanning Electron

ABSTRACTThe importance of micro-crystalline silicon (μc-Si:H) for the photo-conducting dipole antenna application is investigated in this paper. The structural and optical properties of gc-Si:H films prepared by plasma enhanced chemical vapor deposition are studied with Raman spectra, scanning electron microscope, and ellipsometer measurements. The influence of grain size and defects on the opto-electronic characteristics of the photo-conducting dipole antenna is discussed. A sample of the antenna fabricated in our clean room laboratory is reported.

Effect of Grain Size on Structural and Optical Properties of CdO Thin Films Obtained by PLD

2013 ◽  
Vol 662 ◽  
pp. 463-467 ◽  
Author(s):  
Bi Ju Zheng ◽  
Wen Hu
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Optical Properties ◽  
Laser Energy ◽  
Cadmium Oxide ◽  
Bandgap Energy ◽  
Cubic Phase ◽  
Structural And Optical Properties ◽  
Grain Sizes ◽  
Cdo Thin Films

Cadmium oxide (CdO) thin films were deposited on quartz glass substrates by pulsed laser deposition from ablating Cd metallic targets. The effect of grain size on structural and optical properties of CdO thin films was studied in detail. The structural properties were determined by XRD and a cubic phase was present in all of the as-grown samples. The morphology of CdO films has been investigated by atomic force microscopy. Grain sizes between 156 and 300 nm were determined from the AFM images and increased with laser energy density. The optical properties were studied measuring the transmittance spectra. The room-temperature bandgap energies for each sample were determined from the transmittance by extrapolating absorption coefficient. The bandgap energy varies from 2.31 to 2.55 eV following closely the quantum confinement dependence of energy against crystallite radius. This shows that the absorption edges of these samples are determined primarily by the grain sizes.

scholarly journals The Influence of Tin Oxide Doping on Structural and Optical Properties of (Bi2O3) Thin Films

2018 ◽  
Vol 26 (9) ◽  
pp. 97-106
Author(s):  
Abdullah Mahmood Hussein ◽  
Wlla Mohffod Mohammed ◽  
Sabri Jassim Mohammed
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Optical Properties ◽  
Structural Properties ◽  
Tin Oxide ◽  
Bismuth Oxide ◽  
Optical Power ◽  
Xrd Analysis ◽  
Structural And Optical Properties ◽  
Powder Mixing

          In this research, the powder mixing technology has been used to control the ratio of added, where the addition of tin oxide to the bismuth oxide of by (1,3,5,7)% by using vacuum evaporation method. The range of thickness for thin films (40-100)nm . EDX analysis shows the results of the ratios were close to the required values. XRD analysis shows pure bismuth oxide crystalline of the tetragonal phase (β-Bi2O3), observed that the structural properties improves with addition (1)% and the composition of a triangular compound (Bi64SnO98), and with addition (5)% we have a new triple compound (Bi12SnO20). By increasing the impurities, the structural properties become close from random, the tin oxide begins with bismuth oxide separation. AFM measurement shows the thin films surface a pekes like (nano needle) and the grain size rises to (20.2-22 nm). In the case of increased impurities, the surface becomes smooth, and the nano needle decrease with grain size . The optical properties showed a rise in the value of the optical power gap (2.6-3)eV and directly allowed transitions are simply increasing from (3.3-3.5) eV, and directly forbidden  transitions are simply increasing to from (2.48-2.73) eV.

scholarly journals Influence of Laser Energy on the Structural and Optical Properties of (CdO):(CoO) Thin Films Produced by Laser-Induced Plasma (LIP)

2021 ◽  
Vol 19 (49) ◽  
pp. 42-52
Author(s):  
Kadhim A. Aadim ◽  
Maryam M. Shehab
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Optical Properties ◽  
Laser Energy ◽  
Optical Power ◽  
Structural And Optical Properties ◽  
Average Roughness ◽  
Laser Induced Plasma ◽  
Glass Slides ◽  
Xrd Patterns

In this work, (CdO)1-x (CoO)x thin films were prepared on glass slides by laser-induced plasma using Nd:YAG laser with (λ=1064 nm) and duration (9 ns) at different laser energies (200-500 mJ) with ratio (x=0.5), The influence of laser energy on structural and optical properties has been studied. XRD patterns show the films have a structure of polycrystalline wurtzite. As for AFM tests results for the topography of the surface of the film, where the results showed that the grain size and the average roughness increase with increasing laser energy. The optical properties of all films were also studied and the results showed that the absorption coefficient for within the wavelength range (280-1100 nm), The value of the optical power gap for direct transitions was shown to be reduced by increasing laser energy within the range (4.29-3.7 eV).

Effects of Vapor CdCl2 Treatment on the Properties of CdS Thin Films Prepared by R.F. Magnetron Sputtering

2011 ◽  
Vol 347-353 ◽  
pp. 3477-3480
Author(s):  
Liang Min Cai ◽  
Jian Huang ◽  
Jia Wei Jiang ◽  
Jun Le ◽  
Wei Min Shi ◽  
...  
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Solar Cell Application ◽  
X Ray ◽  
Cds Thin Films ◽  
Cds Films

CdS films were prepared by R.F. magnetron sputtering method. The effects of vapor CdCl2treatment on the properties of CdS films were studied. The vapor CdCl2thermal treatment at different temperature was employed in a CSS device, using CdCl2powder as evaporant. The structural and optical properties of CdS films were investigated by x-ray diffraction (XRD), PL spectra, and transmittance spectra, respectively. The results revealed that the CdS films had a structure of hexagonal wurtzite with a preferential orientation of the (002) plane. A better crystal quality and larger grain size, which are good for the solar cell application, were observed in the CdS samples annealed with CdCl2Subscript text.

scholarly journals Structural and Optical Properties of ZnO-CdO Nanocomposite Using Electrodeposition Method

2016 ◽  
Vol 63 ◽  
pp. 127-133 ◽  
Author(s):  
Zehraa N. Abdul-Ameer ◽  
Ibrahim R. Agool
Keyword(s):  
Grain Size ◽  
Optical Properties ◽  
Surface Morphology ◽  
Electrochemical Deposition ◽  
Energy Gap ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Optical Energy Gap ◽  
X Ray ◽  
Shift Behavior

ZnO,CdO,ZnO-CdO nanocomposite were prepared using electrochemical deposition the prepared samples were characterized using X-ray diffraction and the photoluminenscence spectroscopy (PL) to get the surface morphology leading to calculation of optical energy gap .the grain size determined by Scherrer's equation (22-25) nm .through the calculation of Eg ,it was noticed a red shift behavior in ZnO manner due to addition of CdO content

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