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OPTICAL STUDY OF EFFECT OF CADMIUM SOURCES ON NANOCRYSTALLINE CdS THIN FILMS

V. B. Sanap, B. H. Pawar

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Abstract

Thin films of cadmium sulfide (CdS) have been prepared on glass substrates by chemical bath deposition (CBD) technique using various cadmium (Cd) sources. Cadmium iodide, cadmium chloride, cadmium nitrate and cadmium sulfate have been used as a cadmium source. The effect of cadmium source on film thickness, grain size, crystal structure, surface morphology, optical properties has been studied. The as–deposited CdS films were characterized by XRD, SEM and spectrophotometer. All the CdS films have cubic structure. The grain size of CdS films has been found to be minimum for CdI2 and maximum for CdSO4. The films have 70-80% transmittance, 10-16% absorbance and ~4% reflectance towards the VIS-Near IR region. The band gap found to be sensitive to cadmium source used.

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What this paper is about

Thin films of cadmium sulfide (CdS) have been prepared on glass substrates by chemical bath deposition (CBD) technique using various cadmium (Cd) sources. Cadmium iodide, cadmium chloride, cadmium nitrate and cadmium sulfate have been used as a cadmium source. The effect of cadmium source on film thickness, grain size, crystal structure, surface morphology, optical properties has been studied. The as–deposited CdS films were characterized by XRD, SEM and spectrophotometer. All the CdS films have cubic structure. The grain size of CdS films has been found to be minimum for CdI2 and maximum for CdSO4. The films have 70-80% transmittance, 10-16% absorbance and ~4% reflectance towards the VIS-Near IR region. The band gap found to be sensitive to cadmium source used.

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Available abstract

Thin films of cadmium sulfide (CdS) have been prepared on glass substrates by chemical bath deposition (CBD) technique using various cadmium (Cd) sources. Cadmium iodide, cadmium chloride, cadmium nitrate and cadmium sulfate have been used as a cadmium source. The effect of cadmium source on film thickness, grain size, crystal structure, surface morphology, optical properties has been studied. The as–deposited CdS films were characterized by XRD, SEM and spectrophotometer. All the CdS films have cubic structure. The grain size of CdS films has been found to be minimum for CdI2 and maximum for CdSO4. The films have 70-80% transmittance, 10-16% absorbance and ~4% reflectance towards the VIS-Near IR region. The band gap found to be sensitive to cadmium source used.

Key concepts: Cadmium, Cadmium sulfide, Cadmium nitrate, Nanocrystalline material, Absorbance, Chemical bath deposition, Materials science, Thin film

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OPTICAL STUDY OF EFFECT OF CADMIUM SOURCES ON NANOCRYSTALLINE CdS THIN FILMS — Research Paper | ScholarLens