Thermally stimulated current studies of corona charged Tefzel

Thermally stimulated current spectra from negatively and positively corona-charged samples were measured. For negatively corona-charged samples the temperature for the maximum current shifts with the charging voltage, and the activation energy of the traps increases as the charging voltage increases. The activation energy for positively corona-charge Tefzel is greater than that obtained for negatively charged samples. This higher activation energy is associated with ionic traps in amorphous materials. The positions of the two peaks for positively and negatively corona-charged samples are very close. The total stored charge strongly increase as the charging voltage increases