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The conduction mechanisms of undoped poly(phenylenevinylene) (PPV) thin films are studied by measuring the current-voltage-temperature characteristics and the thermally stimulated currents in metal-PPV-metal sandwich devices. In the high-temperature range, Poole-Frenkel emission is observed with a mean energy level of the localized states of 0.36 eV from the conduction band. Hopping conduction occurs at lower temperatures with probable interactions between the localized states. Thermally stimulated currents show a complex interface region at the polymer-metal top electrode, confirming previous XPS analysis performed on these devices.
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Nguyen et al. (1993) studied this question.
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