Correlation between polarization and space charge phenomena in corona poled ferroelectric polymers
Дата
2001
Науковий керівник
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Видавець
Одеський національний університет імені І. І. Мечникова
Анотація
Polarization and space charge phenomena in ferroelectric polymers are interrelated
due to existence of the depolarizing field. This field must be compensated anyhow in
order to obtain stable residual polarization. It is shown that in corona poled PVDF this
compensation is performed by injected and deeply trapped charges. Experimental evidence
for the charge trapping has been obtained from the dynamics of apparent conductivity
during poling. Irreversible decrease in the conductivity has been observed
during the buildup of ferroelectric polarization independently on poling conditions. Appropriate
calculations have shown that compensating charges are trapped not at the
boundaries of crystallites, as usually believed, but in transition zones separating polarized
parts of the volume from non-polarized ones.
Опис
Ключові слова
polymers, conductivity, separating, anyhow
Бібліографічний опис
Фотоэлектроника = Photoelectronics