Abstract
The electric conduction in polyethylene naphthalate film was investigated under high electric fields. The current strongly depended on the electrode materials, especially on the cathode metal. Schottky-injection current was observed in the specimen with an Al cathode at the fields less than 106 V/cm, while at higher fields (>106 V/cm) tunneling-injection current and electroluminescence were observed simultaneously, suggesting the impact ionization by electrons injected from the electrode.
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