Study of Transmittance of CdS Thin Films Prepared by Spray Pyrolysis

2011 ◽  
Vol 130-134 ◽  
pp. 1011-1015
Author(s):  
Guang Ming Wu ◽  
Zhi Qian Zhang ◽  
Yan Ying Zhu ◽  
Yang Cao ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Spray Pyrolysis ◽  
Gas Flow ◽  
Raw Materials ◽  
Precursor Solution ◽  
Optimum Conditions ◽  
Glass Substrates ◽  
Thin Film Preparation ◽  
Cds Thin Films

Cadmium chloride and thiourea were used as raw materials to synthesize precursor solution, and CdS thin films were prepared on glass substrates by the home-made spray pyrolysis thin-film preparation device.Affects of preparation parameters, for example, the substrate temperature and fog particle velocity on the structure of CdS thin films were emphatically studied in the paper. The results showed that the optimum conditions for preparation of CdS thin films are as follows: the substrate temperature 350 °C, the gas flow rate 4L/min, and the annealing temperature 400 °C. Under the optimum conditions and argon as the carrier gas, with a spray time of 32s, a 1.9μm thickness CdS film which had a (002) plane grain size of 32.3nm was obtained. And the transmittance of the film was above 70% at the wavelength range of from 500nm to 850nm.

EFFECTS OF SPRAY PYROLYSIS DEPOSITION PARAMETERS ON MORPHOLOGICAL, OPTICAL AND STRUCTURAL PROPERTIES OF WO3 NANOSTRUCTURED THIN FILMS

2020 ◽  
Vol 27 (09) ◽  
pp. 1950203
Author(s):  
ALI AKHAVAN MAVARDIANI ◽  
MOHAMMAD BAGHER RAHMANI
Keyword(s):  
Thin Films ◽  
Surface Morphology ◽  
Spray Pyrolysis ◽  
Precursor Solution ◽  
Cost Effective ◽  
Solution Concentration ◽  
Visible Range ◽  
Glass Substrates ◽  
Deposition Parameters ◽  
Vis Spectroscopy

In this experimental research, tungsten trioxide (WO3) thin films were deposited using ammonium tungstate ((NH4)2WO4) by a simple and cost-effective technique of spray pyrolysis on top of glass substrates. The surface morphology, structural and optical properties of prepared samples were studied using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) pattern analysis and UV–Vis spectroscopy techniques, respectively. Studied deposition parameters were: substrate temperature (300, 350, 400, 450 and 500∘C), concentration of the precursor solution (0.01, 0.02, 0.04, 0.08, 0.1 and 0.2[Formula: see text]M), volume of the precursor solution (50, 100, 150 and 200[Formula: see text]mL) and the effect of pulsed spraying at different concentrations (0.01, 0.1 and 0.2[Formula: see text]M). FESEM images showed that the surface morphology has formed like nested micro-fibrous rings with a uniform distribution all over the surface. The XRD patterns revealed that increasing the solution concentration to 0.2[Formula: see text]M shows some peaks which can be attributed to WO3 with the hexagonal crystal structure. Transmission spectra of the samples indicate that all of the prepared samples are transparent in the visible range, with the calculated direct bandgap ranging from about 2.93[Formula: see text]eV to 3.96[Formula: see text]eV, depending on the deposition conditions.

scholarly journals Study of some structural , optical , Electrical Properties of CdS thin films deposited by chemical Spray Pyrolysis Method

2009 ◽  
Vol 6 (3) ◽  
pp. 519-225
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Spray Pyrolysis ◽  
Energy Gap ◽  
Hall Effect Measurement ◽  
Spray Pyrolysis Method ◽  
Chemical Spray Pyrolysis ◽  
Glass Substrates ◽  
Pyrolysis Method ◽  
Cds Thin Films

In this research we prepared CdS thin films by Spray pyrolysis method on a glass substrates and we study its structural , optical , electrical properties .The result of (X-Ray ) diffraction showed that all thin films have a polycrystalline structure , The relation of the transmission as a function of wavelength for the CdS films had been studied , The investigated of direct energy gap of the CdS its value is (2.83 eV). In Hall effect measurement of the CdS we find the charge carriers is p – type and Hall coefficient 1157.33(cm3/c) ,Hall mobility 6.77(cm2/v.s)

scholarly journals Effect of substrate temperature on structural and optical properties of cadmium sulfide thin films prepared by evaporation thermal deposition

2019 ◽  
Vol 30 (1) ◽  
pp. 205
Author(s):  
Nadheer Jassim Mohammed ◽  
Hassan A. Mahdi ◽  
Safaa F. Madlul ◽  
Adnan Kh. Hasan
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Substrate Temperature ◽  
Cadmium Sulfide ◽  
Wave Length ◽  
Xrd Analysis ◽  
Structural And Optical Properties ◽  
Thermal Deposition ◽  
Glass Substrates ◽  
Cds Thin Films

In this research , we study the effect of substrate temperature (423K and 473K) on structural and optical properties for thin films of cadmium sulfide (CdS) by evaporation thermal deposition method on glass substrates and the thickness was about (390nm).XRD analysis showed that CdS thin films prepared at (423K and 473K) are single crystal and have preferred orientation along (002).The grain size was found to be increased with increasing substrate temperature, in addition, the atomic force microscopy(AFM) an increase in root mean square (RMS) with an increase in substrate temperature. The absorbance and transmittance spectra have been recorded in the range off wave length(400-800nm), and it was found that the transmittance decreases with increasing substrate temperature, while the optical band gap decreases from (2.4-2.2ev)for allowed direct transition. CdS thin films should further investigated for application towards the fabrication of solar cells.

Nanostructures and Properties of Vanadium Oxide Thin Film Prepared by Spray Pyrolysis Method

2017 ◽  
Vol 890 ◽  
pp. 287-290
Author(s):  
Elvan Şenarslan ◽  
Betül Güzeldir ◽  
Mustafa Sağlam
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Precursor Solution ◽  
Oxide Thin Film ◽  
Morphological Properties ◽  
Solution Flow Rate ◽  
Spray Pyrolysis Method ◽  
Solution Flow ◽  
Glass Substrates ◽  
Deposition Parameters

In this research, we reported structural, optical and morphological properties of va nadium oxide thin films directly grown on the glass substrates by fully automated spray pyrolysis equipment. The substrate temperature was set at 450 °C and the nozzle to substrate distance was optimized to be 20 cm. The precursor solution was prepared as 0.05 M by mixing 0.393 gr of vanadium trichloride (VCl3) in 50 mL of deionized water. The deposition parameters were 5 mL in 1 minute solution flow rate, 90° position of spray nozzle towards the substrate. Atmospheric air was used as carrier gas with 2.5 mbar pressure. Nanostructures and optical properties of as-grown films examined using X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible spectrophotometer techniques. After thin films annealed at 500 °C, SEM, XRD and absorption measurements were taken again. The obtained results were compared.

scholarly journals Crystalline phase evolution in nanostructured copper sulfide thin films prepared by spray pyrolysis method: the effect of annealing

2017 ◽  
Vol 35 (3) ◽  
pp. 673-680 ◽  
Author(s):  
Roshanak Rafiei Nazari ◽  
Hoda Enayati Taloobaghi ◽  
Hosein Eshghi
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Physical Properties ◽  
Spray Pyrolysis ◽  
Copper Sulfide ◽  
Phase Evolution ◽  
Spray Pyrolysis Method ◽  
Spectra Analysis ◽  
Glass Substrates ◽  
Pyrolysis Method

AbstractIn this study, physical properties of copper sulfide thin films deposited on glass substrates by spray pyrolysis method at different temperatures (260 °C, 285 °C and 310 °C) were investigated. The influence of annealing time on the physical properties of grown layers was also studied. According to FESEM images, the sizes of the compact copper sulfide grains were varied from about 100 nm to 60 nm. Hall effect and resistivity measurements confirmed that all samples had p-type conductivity. The XRD patterns showed that, together with the dominant digenite phase (Cu1.8S) in all samples, the copper-rich phases also appeared as a result of increasing substrate temperature. The optical UV-Vis spectra analysis showed that due to increasing the substrate temperature, the band gap of the layers was reduced from about 2.4 eV to 2.0 eV. We found that as a result of annealing at 400 °C for 1.5 h in Ar atmosphere, the sample which was initially grown at 310 °C with the highest copper content, totally transformed into the polycrystalline monoclinic chalcocite phase (Cu2S) with 3D nanoporous architecture.

scholarly journals Fabrication of Transparent Conductive Zinc Oxide Co-Doped with Fluorine and Zirconium Thin Solid Films by Ultrasonic Chemical Pyrolysis: Effects of Precursor Solution Aging and Substrate Temperature

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Luis Castañeda
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Substrate Temperature ◽  
Aging Time ◽  
Precursor Solution ◽  
Optical Transmittance ◽  
Visible Spectral Range ◽  
Glass Substrates ◽  
Starting Solution ◽  
Co Doped

Highly transparent, conducting zinc oxide [ZnO] thin films co-doped with fluorine and zirconium have been deposited on glass substrates by the ultrasonic chemical spraying technique. The effects of aging of the starting solution and substrate temperature on the structural, morphological, and electrical properties of the ZnO:F:Zr films have been studied. The resistivity of the films decreases with the aging time of the starting solution until the seventeenth day reaching a minimum of about 1.2×10−2 Ω cm and then increases. Though all the samples are of polycrystalline hexagonal wurtzite type and grow preferentially with (002) plane parallel to the substrate, their morphology depends strongly on the aging time of the reaction solution. The optical transmittance of all the films remained around 80% in the visible spectral range. These highly transparent, low resistive thin films are expected to be highly useful as transparent electrodes in the fabrication of thin film solar cells.

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