An investigation of conduction mechanisms at high-field in PET

The high-field electrical conduction, up to 60 kV/mm, of PET films is investigated in this paper. The behavior of time-to-peak, observed in transient charging current, vs electrical field fits well with the SCLC model, showing a power relationship. An exponential law is obtained between time-to-peak and temperature. Steady state regime provides charging-current density vs. electrical field plots which show clear transition from an ohmic behavior, at low field, to the SCLC mechanism. The threshold for this transition is a function of temperature.