The Effect of Chlorine Concentration on the Optical Constants of SnS Thin Films

Chlorine doped SnS have been prepared utilizing chemical spray pyrolysis. The effects of chlorine concentration on the optical constants were studied. It was seen that the transmittance decreased with doping, while reflectance, refractive index, extinction coefficient, real and imaginary parts of dielectric constant were increased as the doping percentage increased. The results show also that the skin depth decrease as the chlorine percentage increased which could be assure that it is transmittance related

Annealing Effect on Some Optical Properties of Cr2O3 Thin Films Prepared by Spray Pyrolysis Technique

Cr2O3 thin films have been prepared by spray pyrolysis on a glass substrate. Absorbance and transmittance spectra were recorded in the wavelength range (300-900) nm before and after annealing. The effects of annealing temperature on absorption coefficient, refractive index, extinction coefficient, real and imaginary parts of dielectric constant and optical conductivity were expected. It was found that all these parameters increase as the annealing temperature increased to 550°C

The Effects of ? – Rays on The Optical Constants of ZnS Thin Films

ZnS thin films were grown onto glass substrates by flash evaporation technique, the effects of ? – rays on the optical constants of ZnS these films were studied. It was found that ? – rays affected all the parameters under investigation

Annealing Effect on the Optical Properties of Sb2S3 Thin Films

Sb2S3 thin films have been prepared using chemical bath deposition .these films were annealed for different temperatures 373, 473 k. Absorbance and transmittance spectra were recorded in the wavelength range (300- 900) nm. the nature of electronic transitions was determined, it was found that these films have direct allowed transition with an optical energy gap of 1.72, 1.76, 1.82 eV before and after annealing respectively. the extinction coefficient, refractive index, real and imaginary part of dielectric constant were also measured before and after annealing

Optical properties of BaCl2 doped poly (vinyl alcohol) films

The effects of BaCl2 dopant on the optical properties of poly (vinyl alcohol) have been investigated. Pure and BaCl2 doped PVA films were prepared using solvent casting method. These films were characterized using UV/VIS technique in order to estimate the kind of transition which was found to be indirect transition. The value of the optical energy gap was decrease with increasing dopant concentration. Refractive index, extinction coefficient and Urbach tail have been also investigated; it was found that all the above parameters affects by doping

The Effect of Thickness on Some Optical Properties of Sb2S3 Thin Films Prepared by Chemical Bath Deposition

Sb2S3 thin films have been prepared by chemical bath deposition on a glas sub Absorbance and transmittance spectra were recorded in the wavelength range (30-900) nm. The effects of thickness on absorption coefficient, reflectance, refractive index, extinction coefficient, real and imaginary parts of dielectric constant were estimated. It was found that the reflectivity, absorption coefficient , extinction coefficient, real part of dielectric constant and refractive index, all these parameters decrease as the thickness increased, while the imaginary part of the dielectric constant increase as the thickness increased

Dispersion Parameters of Copper Sulphate Doped PMMA

Films of PMMA and copper sulphate doped PMMA have been prepared by casting method. Absorbance and transmittance spectra were recorded in the wavelength range (300-900) nm in order to calculate, single oscillator energy, dispersion energy, average oscillator strength, the refractive index at infinite wavelength, M-1 and M -3 moments of the optical spectra, it was found that all these parameters were effected by doping

New Design of Hairpin-Koch Fractal Filter for Suppression of Spurious Band

The use of fractal geometries has significantly impacted many areas of science and engineering; one of which is microwave filters. Microstrip filters have been widely used in a variety of microwave circuits and systems, it has received much attention because of the advantages such as compact and simple structures, small sizes, easy fabrication and low cost, etc., and all these features are the requirement of the wireless communication systems. The design of a hairpin-Koch filter has been proposed. This filter exhibits periodic frequency response. The spurious bands are being suppressed significantly through the implementation of Koch fractal on the micro strip coupled line

Annealing Effects on the some Optical Properties of Fe 2 O 3 Thin Films Doped by NiO

Abstract. Nickel oxide doped Fe 2 O 3 thin films have been prepared by spray pyrolysis technique on glass substrate. The initial solution was including a 0.1 M/L for both NiCl 2 and FeCl 3 diluted with re-distilled water and a few drops of HCl. The effect of annealing temperature on some optical properties was studied, using UV-Visible spectrophotometer to determine transmittance and absorbance spectra at a thickness of 400 nm. The reflectance increased with increasing annealing temperature, the same behavior observed for absorption coefficient α,extinction coefficient k and refractive index n, while the transmittance decreases slightly with increasing annealing temperature and the optical energy gap was decreased from 2.86 eV before annealing to 2.70 eV at 500 ºC annealing temperature

Effects of Ni - Doping on the Characterization of Nanostructured CdS Thin Films

Effect of nickel doping was investigated on doped CdS films by spray pyrolysis technique and examined by XRD, AFM, and UV-VIS spectroscopy. The increasing of Ni doping ratio improve (020) preferential orientation. XRD analysis confirmed the CdS nanostructure for all samples. The crystallite size for pure CdS showed an increase from 19.98 nm to 27.04 nm on doping, whereas the strain (%) parameter was decreased from 25.0 to 13.3. AFM images offer a decrease in roughness from 6.5 nm to 3.48 nm with Ni – 4% content. Transmittance was exceeding 70% in the visible range by Ni content. Also, the bandgap was decreased from 2.4 to 2.3 eV with the increment of Ni content