International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 2, February 2017

International Journal of Science and Technology


Optical Properties of Chemical Bath Deposited Ag2S Thin Films

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Author I. A. Ezenwa, Okereke N. A. , N. J. Egwunyenga
On Pages 101-106
Volume No. 2
Issue No. 3
Issue Date March, 2012
Publishing Date March, 2012
Keywords optical properties, photovoltaic, Ag2S thin films, chemical bath deposition technique, complexing agent


Abstract

Thin films of Ag2S were deposited at room temperature on glass substrates immersed in a bath mixture containing aqueous solutions of silver nitrate (AgNO3), thiourea, Ethylenediaminetetra-acetate disodium Salt (EDTA) and ammonia solution. AgNO3, for silver ion source, thiourea for sulphide ion source, EDTA as a complexing agent and ammonia for pH adjustment.. The films were studied for its optical properties using a Janway 6405 UV/VIS spectrophotometer and the results showed highest absorbance in the UV region (<400nm). Poor averaged reflectance, very low transmittance in the UV region which increases in the visible region/near infrared region, with an average of about 85% at >700nm. The optical band gap energy was found to be 1.8eV. Also the films exhibited averaged refractive index range of 1.9eV to 2.5eV.

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