Carrier mobilities in poly(vinylidene fluoride)

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Abstract
Irradiation of poly(vinylidene fluoride) samples with a partially penetrating electron beam generates an ionised region adjacent to the electrode of incidence. An external electric field extracts carrier from the irradiated into the non-irradiated region. In the steady state the field-induced drift of carriers through the non-irradiated region can be described in terms of the conventional theory of space-charge-limited currents. Emission of the carriers occurs from a virtual electrode located at the interface between the irradiated and the non-irradiated region. The mobility of both carrier species is found to be the same and has a value mu =2*10-8 cm2 V-1 s-1. Attainment of the steady state is preceded by long-lasting and complex transient effects which depend on the density of the incident electron beam current and on the magnitude of the applied electric field. Carrier transit time effects appear to have a small influence.

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