Influence of iodine addition on elemental composition, structure and surface morphology on lead selenide thin films prepared by chemical bath deposition method was studied by methods of X-ray diffraction analysis and scanning electron microscopy with elemental energy-dispersive analysis. Content of iodine in thin films raised to 4.25 at. % with increasing concentration of ammonium iodide in bath solution. Influence of iodine dopant on lattice constant and crystallite size of lead selenide thin films was found.