Hole conductivity estimation in lead iodide film through kinetic study of tarnishing reaction

Article abstract of DOI:10.1016/0025-5408(95)00192-1

Hole conductivity values in compact and adherent PbI₂ film grown on Pb have been estimated from the isothermal parabolic rate constants through tarnishing study of pure lead in iodine atmosphere following the inverse procedure of Wagner's tarnishing/scaling equation. Iodide films have been grown inside a specially designed iodination reactor. The investigation has been confined to the temperature and iodine pressure ranges of 423-523 K and 0.615-6.578 kPa, respectively. Estimated hole conductivity values have been found to follow a pressure dependence relation of the type σ_h? = σ⁰_h?p^1/2_I2 with an associated activation energy value of 66 kJ.mol^-1. The iodide film has been characterised by SEM, EDS and XRD analyses.