To the mechanism of oxygen effect on polyphenylene vinylene photoconductivity

A model and scenario of delayed recombination of charge carriers in polymer with conjugated bonds are suggested, which allow experimental data on the persistent kinetics of photoinduced conductivity of polyphenylene vinylene films irradiated in air to be described. The model suggests that recombinat ion of charges in the presence of oxygen solved in a polymer sample gives r ise to metastable intermediate states - complexes involving oxygen lifetime of which before recombination is 1/k(1) = 107 s and before dissociation to free charges, 1/k(-1) = 16 s (at room temperature).