Paper Title:
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.

  Info
Periodical
Materials Science Forum (Volumes 480-481)
Edited by
A. Méndez-Vilas
Pages
495-500
DOI
10.4028/www.scientific.net/MSF.480-481.495
Citation
J. N. Marat-Mendes, E. R. Neagu, R. M. Neagu, "Electric Charge Trapping and Transport at Medium Fields in Low-Density Polyethylene", Materials Science Forum, Vols. 480-481, pp. 495-500, 2005
Online since
March 2005
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