Electric Charge Trapping and Transport at Medium Fields in Low-Density Polyethylene

José N. Marat-Mendes; Eugen R. Neagu; Rodica M. Neagu

doi:10.4028/www.scientific.net/MSF.480-481.495

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HomeMaterials Science ForumMaterials Science Forum Vols. 480-481Electric Charge Trapping and Transport at Medium...

Electric Charge Trapping and Transport at Medium Fields in Low-Density Polyethylene

Abstract:

The transient conductivity in low-density polyethylene is studied. Isochronal currentvoltage measurements for 1800 s and 1 day time intervals are carried out under dry N2 atmosphere. When after every measurement the sample is fully discharged at high temperature the isochronal current - voltage characteristic reveals an ohmic behavior. When the next field increase is applied without sample discharging the current-voltage characteristic is super-quadratic. We explain this increase of the current assuming that a fraction of the previous injected charge is detrapped by the field and it contributes to current increase. Consequently the current – voltage characteristic is strongly dependent on the time lag between two successive rises in the field. Neither the Poole-Frenkel mechanism nor the Richardson – Schottky mechanism can by used to explain the experimental results. The isothermal charging and discharging currents are explained assuming the movement of injected/ejected charge in the resultant local field. The values obtained for the adjustable parameters of the model are in good agreement with the values in the literature.