Size dependent structural, optical and morphological properties of ZnS:Cu thin films |
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Authors: | S Muthu Kumaran and M Ashok Kumar |
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Affiliation: | (1) Department of Physics, H.H. The Rajah’s College, Pudukkottai, Tamilnadu, 622001, India;(2) Department of Physics, Srinivasan College of Arts & Science, Perambalur, Tamilnadu, 621212, India |
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Abstract: | ZnS:Cu thin films have been deposited on glass substrate by a simple neutral pH solution synthesis route and chemical bath
deposition technique. The copper concentration was varied between 0 and 0.1 M%. The X-ray diffraction and scanning electron
microscope studies show the average size of the nanoparticles are below 4 nm (Bohr diameter). The effect of film thickness
on the optical and structural properties has been studied. The optical absorption studies show the band gap energy of ZnS:Cu
films decreases from 3.68 to 3.43 eV as thickness varied from 318.3 to 334.1 nm. The structural estimation shows the variation
in particle size from 2.67 to 3.14 nm with thickness. The insignificant change in band gap may be due to the increase in particle
size and quantum size effect. |
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Keywords: | |
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