Abstract
The purification technique and the effects of purification on the dark and photoconductivities of vacuum evaporated phthalocyanine thin film are reported. Metal-free and copper phthalocyanine were purified by a simple train sublimation technique. Variation of the impurity contents with the purification was investigated by a mass analysis. The impurities in phthalocyanine pigments have been mostly removed by the purification.
The dark and photoconductivities are decreased due to the removal of impurities by the purification. The decrease of photoconductivity is due to the density of exciplex and the probability of dissociation of excitons in the the local electric field near the impurities.
