The effect of the air environment and prolonged illumination on conductivity and photoconductivity of organic-inorganic perovskite CH3NH3PbI3 films

A significant effect of the environment (vacuum, air) on the results of measurements of CH3NH3PbI3 films conductivity and photoconductivity is shown. It was found that prolonged illumination with white light does not change the value of CH3NH3PbI3 interband photoconductivity (hν > 1.6 eV), but leads to a metastable increase in the photoconductivity near the quantum energy hν ≈ 1.2 eV. This indicates a photoinduced creation or filling of nonrecombination localized states, located at an energy distance of 1.2 eV from the transport level of nonequilibrium charge carriers.