Papers by Keyword: Cadmium Sulphide

Abstract: Silver doped cadmium sulphide nanocrystallites (CdS:Ag), undoped cadmium sulphide nanocrystallites (CdS), have been synthesized by the chemical precipitation method. Nanocrystalline materials are confirmed by the scanning electron microscopy method. The presented elements are identified by EDAX (Energy Dispersive X-ray Analysis). X-ray diffraction Method (XRD) is used to calculate the average size of the prepared sample. Morphological studies (SEM) are used to analyse the nature of the sample. The results are reported in this paper.

Abstract: In this work, cadmium sulphide (CdS) buffer layer of CuInSe2 (CIS) thin film solar cell is fabricated by separate-melting Chemical Bath Deposition (CBD) methods. The reason of adopting the CdS thin film as the buffer layer of CIS thin film solar cell is that the CdS can act as energy gap buffer and reduce the band-offset between CIS absorbing layer and the Transparent Conductive Oxide layer. The CdS thin films are generated by the separate-melting CBD methods in situation of atmosphere. In order to analyze the characteristics of the CdS thin films conveniently, the CdS thin films are firstly fabricated on Soda-lime, and the final found optimal CdS thin film is fabricated on the CIS/Mo/Soda-lime glasses. Then the p-n diode characteristic of the CdS/CIS/Mo/Soda-lime glasses is measured by four-point probe. And the CdS thin films are fabricated by the separate-melting CBD methods through various combinations of time interval from 40 and 60 minutes and temperature range from 70,75,80 and 85°C. It is found that the combination of 85°C and 60 minutes is optimal to obtain smoother surface and more uniform thickness of CdS thin film. Additionally from optical characteristic analysis, in situation of emitted light wave length 500 nm, the transmittance of the cadmium sulphide thin film is 61%. Meanwhile, the band gap is close to theoretical value of 2.4 eV.

Abstract: The CdS/CNTs nanocomposites were prepared by a simple heating refluxing method, and the scattering of CdS on CNTs surface was controlled by a dropping way. The samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscope (UV-Vis) .The photocatalytic activity of the samples was tested in the degradation of Methylene blue dye wasterwater under simulated sunlight with 500w short arc xenon lamp. The results showed that the photocatalytic activity of CdS/CNTs composites was enhanced by controlling CdS scatter on CNTs surface, and the forbidden band width was appropriate lowered when CNTs was added, and the scatter of CdS on CNTs surface was uniform and the photocata-lytic activity was the highest when the mass ration of CdS with CNTs was 4:1.The CdS composites have good stability and potential industrial application.

Abstract: We studied the influence of the mixing on the properties of CdS powders obtained by Chemical Bath Deposition. The powders were obtained from baths containing cadmium chloride, thiourea, and ammonia. The obtained powders were characterized using FT-IR, in order to evaluate the purity of the obtained powder. Granulometric studies were made in order to establish the grain size distribution of the particles, and X ray diffraction in order to determine the structure of nanostructured CdS.