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Abstract
The behaviour of thin polystyrene layers biased by a d.c. electric field has been studied. These thin polymer layers, obtained by glow discharge polymerisation of styrene, have thickness between 1000 and 10 000 Å. The transient mode which appears when a step voltage is applied to a metal-polymer-metal (MPM) structure has been studied. Absorption and resorption currents are explained by the standard Cole and Cole formalism which is in good agreement with the experimental results. The study of the permanent mode and its variation with the amplitude of the step voltage allows the polymer conduction mechanism to be analysed. Study of the conductivity variation with the polymer thickness and with its temperature shows that only the Poole-Frenkel effect can explain the experimental results, the depth of the corresponding potential well being 0.85 eV.
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