SPACE-CHARGE DISTRIBUTED RELAXATIONS IN VACUUM-DEPOSITED POLYVINYL FLUORIDE FILMS

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