Study of the Effect of Different Dopants on Optical Properties of ZnS Thin Films
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Study of the Effect of Different Dopants on Optical Properties of ZnS Thin Films
Nasser Saad Al-Din -Abalh Alzoubi , Zeinab Alhassan
Pure ZnS thin films and doped with different dopants were prepared onto glass substrates by chemical bath deposition method. ZnS films were deposited using ZnCl2 as zinc ion source, SC(NH2)2 as a sulfide ion source and Ammonia Hydroxide (NH4OH) to controlled PH value. the solution temperature is 70Cº .
The transmission measurements were carried out in the wavelength range (300-2000) nm using (Jasco V-570 Double Beam) Spectrophotometer. The optical energy gap of prepared films were determined. It is 3.8eV for pure ZnS thin film. It was found that the energy band gap values of films doped with copper and antimony are greater than pure films, while its value for doping with silver is less than pure films.
Photoluminescence properties of of prepared films were studied. The photoluminescence spectra of the pure films are showed three peaks centered around (325,450 and 505) nm. The ZnS :Cu films had one peak at (323)nm. The ZnS:Ag films, also had three Peak centered around (329,440,460) nm. While the ZnS: Sb films, one peak is observed at (318) nm. It was found blue shift for peak centered around 325 nm when ZnS thin films were doped with copper and antimony, whereas a red shift in it for doping with silver.
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