Nanocrystalline Lead Sulphide Thin Films Deposited by Chemical Bath Deposition Technique Jamal Fadhil Mohammad 1 Vol: 13 No:2 , April 2017 DOI: http://dx.doi.org/10.24237/djps.1302.129A P-ISSN: 2222-8373 E-ISSN: 2518-9255 Nanocrystalline Lead Sulphide Thin Films Deposited by Chemical Bath Deposition Technique Jamal Fadhil Mohammad University of Anbar- College of education for pure Sciences- Department of Physics Received 16 February 2016 ; Accepted 18 September 2016 Abstract In the present paper, nanocrystalline lead sulphide (PbS) thin films were prepared by a chemical bath deposition (CBD) technique onto glass substrates using the mixed aqueous solutions of lead acetate, thiourea and ammonia. The structure of the films was studied by X-ray diffraction. XRD studies show that the preferential orientation is (200). The optical properties were carried out from spectroscopy measurements in the wavelength range 300-1100 nm. The optical band gap of the prepared films was found to be higher as compared with respect to the bulk value (0.4 eV) due to quantum size effect with shift toward shorter wavelengths. Keyword: Nanocrystalline thin films, Structural properties, Optical properties, CBD technique, lead sulphide.