X-Ray-Induced Thermally-Stimulated Currents in Polyvinylidene Fluoride

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Abstract
Thermally-stimulated currents (TSC) induced by a prior X-irradiation in polyvinylidene fluoride (PVDF) were observed and the nature of carrier traps was discussed. PVDF shows three split TSC peaks, the P1, P2 and P3 peaks in ascending order of temperature. Both P1 and P2 peaks are due to dipole orientation in amorphous regions associated with the γ- and β-relaxations, respectively. The P3 peak is due to carrier traps in the regions related to the α-type PVDF crystallites. The field dependence of the TSC revealed that at least two kinds of carrier traps are responsible for the P3 peak. The dependence of the irradiation temperature on TSC, together with the field dependence, suggests that the carrier release from one kind of carrier trap is strongly affected by the electric field.

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