Space-charge distributed relaxations in vacuum-deposited polyvinyl fluoride films

The thermally stimulated discharge behaviour of vacuum-deposited polyvinyl fluoride films (about 1 mu m thick) studied as a function of polarization temperature (313-453 K) and polarization field (1-14 kV cm(-1)) shows a single relaxation peak whose peak temperature, charge, activation energy and so on depend strongly on the polarization parameters. The peak has been attributed to space-charge distributed polarization due to the migration of the charge carriers, injected from the electrodes or present inherently, over macroscopic distances and their subsequent trapping; the trapping levels being distributed in the range of energies 0.55-0.69 eV.