Study on The Effect of Annealing On The Optical Properties of The Pure Lead Sulfide (PbS) Films and Doping by Copper

Abstract

Lead Sulfide (PbS) thin films were prepared by spraying pytolysis Method (SPM). Glass substrates with (1 x 2.6 x 7.6) cm were used at room temperature . Thin film of (PbS) was a doped by (Copper ,Cu) then the effect of annealing at different temperatures(100,200)C0 on the optical properties of (pbS) and (PbS:Cu) are investigation.
The optical properties of the (pbs)and (pbs:cu) such as absorbance and transmittance have been analyzed by using (FTIR - 8400S) instrument. The optical band gab energy has been obtained from the plot between the (αhυ) as a function of photon energy (hυ) was (0.43) eV for (pbs) and (0.41 ) eV for (pbs:cu) at the room temperature . The absorption spectra of the films showed that (pbs) and (pbs:cu) have a direct band gap increase slowly with temperature annealing