Abstract
The dielectric losses in tetrabenzofulvalene and rho -terphenyl have been measured. The dielectric losses in the two organic aromatic compounds proved to be dependent on the electrodes used in the experiment. This is in agreement with the results of drift mobility experiments in tetrabenzofulvalene, in which the nature of the electrode material turned out to be of great importance. The results presented suggest that the electrical properties of these materials are dependent on carriers injected from the electrode.