Structural characterization of nanocrystattine PbS thin films

Chemical bath deposition method was used to prepared PbS nanocrystalline thin films. lrad acetate and lead nitrate were used as a sources of lead ions Pb2* in solution and thiuoria as a source to sulfur ions 52- . PbS thin films have been deposited at room temperature and 335K with different lead ions source molarity (0.05,0.1 and 0.15M). Study the struchre properties of prepared thin films by X-ray diffraction shows that all films were polycrystalline and possessed cubic skucture. Optical energy gaps of films were calculated depending on the effective mass models and found that the optical energy gap increased with decreasing in gra.in size of cryntal and the values werc in range(0.62- 1.29)eV.