Heat treatment effects on the metal-polymer interface and space-charge formation in thin metallized polyethylene terephthalate films

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Abstract
Space-charge formation in polyethylene terephthalate (PET) ultrathin films has been investigated by means of the thermally stimulated depolarization current (TSDC) method. Important variations of the blocking and injecting properties of the metal-insulator interface have been obtained by using different metals as electrode material and by annealing samples under various conditions, before or after vacuum deposition of electrodes. Depending on the polarization or annealing conditions, conventional and/or anomalous space-charge currents have been observed in the high-temperature region of the TSDC spectrum. Their properties have been explained in terms of modifications of the metal-PET interface.