Capacitance measurements of oxygen doped films of α or β iron phthalocyanine particles dispersed in a binder polymer polycarbonate (MK), with mixed (Al, Au) electrodes are studied. The capacitance of the cells changes in accordance with the morphological forms. A complete study of the space charge density as a function of temperature is carried out. The results obtained are in accordance with the model proposed for the dopant, oxygen. The low conductivity of the β iron phthalocyanine is due in large part to deep trap carriers presented in this phase.