Dispersive transport of charge carriers in polycrystalline pentacene layers

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Abstract
This paper presents an experimental study of carrier drift in polycrystalline pentacene layers under small-signal conditions. The shape of the transient current, caused by pulsed bulk carried generation, and the transit time field-dependence are analysed in detail for various temperatures. The data obtained indicate a dispersive transport regime. A theory of dispersive transport with bulk generation is formulated in order to explain the experimental results. The theory is based on the concept of transport controlled by carrier trapping on localised levels distributed over a wide energy region. Particular attention is given to the exponential and Gaussian models of trap energy distribution. The Gaussian model seems more realistic for interpretation of experimental data on polycrystalline pentacene layers.