Lead Iodide single crystals successfully grown by simple gel method. Some dopants were added into the Lead Iodide crystals with proper precaution. Thin films of pure material of Lead Iodide and gel grown crystals have been prepared by thermal evaporation technique. XRD of these films were recorded and compared. Lattice parameters have been calculated by computer programming and they are matching with the JCPDS data of the Lead Iodide XRD of all the films are compared and reported. Lattice constants are observed to be sensitively affected by doping. The band gaps of these films were calculated by measuring the transmittance. It is found that the energy band gap of these films goes on decreasing as the thickness of the films increased. The band gaps of the doped films were found to decrease significantly.
