Structural, Optical and Electrical Properties of (PbS: Co) Nanostructured Thin Films Synthesized by Pulsed Laser Ablation Deposition Technique

Abstract

In the present work, thin films of Lead sulphide (PbS) and different mixing ratios of Co (30%, 50% and 70%) were prepared by  (PLD) technique at glass substrates at 1064nm wavelength with 600mj laser energy. The structural measurements were determined by X-ray diffraction studies for pure PbS and other mixing ratio . The present thin films were showed that the structure is face-centered-cubic. the grain size were found 17.74 nm for pure and increase to 31.3 and 55.67 nm when the mixing increase to 30% and 50% respectively and decreases to 39.57nm when mixed with 70% Co. The optical properties were measured at wavelength (300 - 1100) nm for PbS thin films. The absorption coefficient increases with increasing mixing ratio, The energy gap for pure PbS thin film was ( 2.43 ev)  and increases to (2.54 ev) and then decreases to (2.42 ev) and (2.30 ev) with increasing of mixing ratio.