James Ezema | University of Nigeria, Nsukka (original) (raw)
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Jaypee University Of Information Technology (Juit.Ac.In)
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Papers by James Ezema
Nanocrystalline Cadmium sulfide (CdS) thin films were prepared by chemical bath deposition techni... more Nanocrystalline Cadmium sulfide (CdS) thin films were prepared by chemical bath deposition technique
on a glass substrates at a temperature of 80°C and at different deposition times with composition of
cadmium chloride (CdCl2), thiourea (CS (NH2)2), ammonia solution (NH4OH) and triethanolamine (TEA)
solution. The characterization of thin films was carried out for the structural, morphological and optical
properties using X-ray diffraction (XRD), Scanning electron microscope (SEM) and UV-VIS
spectrophotometer. XRD studies show that the preferential orientation (002), analysis shows that the
prepared samples have hexagonal crystal structure. Scanning electron microscopy (SEM) reveals small
nanosized grains tied up in a fibrous-like porous structure uniformly distributed over the surface of the
substrate for the CdS films. A UV-VIS optical spectroscopy study was carried out to determine the band
gap of the nanocrystalline CdS thin films. The average band gap was found to be 2.25 eV, which is
lower than the bulk value (2.4 eV). The increase in absorption coefficient with photon energy makes the
deposited CdS thin film a suitable candidate for the fabrication of solar cells.
Nanocrystalline Cadmium sulfide (CdS) thin films were prepared by chemical bath deposition techni... more Nanocrystalline Cadmium sulfide (CdS) thin films were prepared by chemical bath deposition technique
on a glass substrates at a temperature of 80°C and at different deposition times with composition of
cadmium chloride (CdCl2), thiourea (CS (NH2)2), ammonia solution (NH4OH) and triethanolamine (TEA)
solution. The characterization of thin films was carried out for the structural, morphological and optical
properties using X-ray diffraction (XRD), Scanning electron microscope (SEM) and UV-VIS
spectrophotometer. XRD studies show that the preferential orientation (002), analysis shows that the
prepared samples have hexagonal crystal structure. Scanning electron microscopy (SEM) reveals small
nanosized grains tied up in a fibrous-like porous structure uniformly distributed over the surface of the
substrate for the CdS films. A UV-VIS optical spectroscopy study was carried out to determine the band
gap of the nanocrystalline CdS thin films. The average band gap was found to be 2.25 eV, which is
lower than the bulk value (2.4 eV). The increase in absorption coefficient with photon energy makes the
deposited CdS thin film a suitable candidate for the fabrication of solar cells.