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Synthesis and characterization of screen-printed CdS films

Kumar V. (Department of Physics, Krishna Institute of Engg. & Technology, Ghaziabad, India)
Sharma D.K. (Department of Physics, Krishna Institute of Engg. & Technology, Ghaziabad, India)
Bansal M.K. (Department of Physics, B.I.T, Meerut, India)
Dwivedi D.K. (Department of Physics, M.M.M.E.C, Gorakhpur, India)
Sharma T.P. (Department of Physics, Rajasthan University, Jaipur, India)

Cadmium sulphide films having energy band gap of 2.4 eV found applications in solar cells and electroluminescent devices. CdS polycrystalline films have been prepared on ultra-clean glass substrate by screen-printing technique and then sintered in air. Optimum conditions for preparing good quality screen-printed films have been found. The optical band gaps ‘Eg’ of the CdS films were determined from the UV transmission spectroscopy and were found to be 2.47eV. The Wurtzite structure of CdS films was confirmed by X-ray diffraction analysis. DC conductivity and activation energy of films was also measured in vacuum by two-probe technique.

Keywords: CdS, screen printing, conductivity, x-Ray diffraction, band gap, photoluminescence