Optical and photocundivity properties of dan doped polycarbonate thin films

Having low dielectric coefficient and high optical transperency and also easy fubrication in thin film form cheap mass production made polimeric materials superior over inorganic crystals. In order to find out the best polimeric materials for device application many work done over world in last 20 years.In this work undoped PC and DAN and Pc doped PC films prapered by dip coating method. The refractive indices of thin films measured through spectroscopic method. Relatively low refractive index value of 1.3 ( was found. Thicknesses of the films were measured by a perthometer. 4-5 of thickneses are found. Dc and ac electrical conductivities of thin films were measured at different temperatures and frequncies.For NLO properties of thin films the films were electrically poled. The centrosymmetry in thin films were broken through electrical poling process. DAN NLO molecules were aligned in the line of electric field direction. The reduction in peak value of absorption spectrum proved the non-centrosymmetric order in polimer thin films.The dc and ac fotoconductivity measurements of these samples were also carried out. However, it is found that these samples have not shown any photoconductivity properties.Key Words: Polymer, NLO molecules, phthalocyanine, DAN, thin film, refractive index, electrical poling, photoconductivity, central symmetric structure.