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Abstract
Space-charge effects in PZT thin films obtained by rf cathode sputtering were studied. There is evidence that space charge forms in the ferroelectric phase during dielectric aging. Charge accumulation and disappearance were investigated by the method of thermally stimulated depolarization currents. Current peaks due to preliminary poling by a dc electric field and dielectric aging were determined. Effects that can be attributed to the rearrangement of point defects with the production of defect complexes, such as dimers, were observed for the first time. The activation energies for trap depletion (0.98 eV) and defect complex breakdown (1.20 eV) were found.
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