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Charge injection and conduction on the surface of insulators

J. Appl. Phys. 83, 5870 (1998); doi:10.1063/1.367448

Issue Date: 1 June 1998

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M. P. Pépin and H. J. Wintle
Department of Physics, Queen's University, Kingston, Canada, K7L 3N6
We have calculated numerically the flow of charge onto an insulator surface by injection from an electrode touching the surface, using conformal mapping in conjunction with the boundary element method. We have assumed that the driving fields are due to the electrodes and to the surface charge itself, while the natural conductivity of the surface is negligible. We have considered three geometries used experimentally. In general, we find that for strong injection, the surface charge is confined to the region close to the injecting electrode, that the absorption current behaves as I [proportional] t–gamma,gamma ~ 1/3, and that the absorption and resorption currents do not exhibit mirror symmetry. Furthermore, if the active electrode can inject charges of either sign, then on shorting the electrodes a counter charge is injected, which leads to a more rapid discharge at early times but does not give rise to a current reversal (anomalous current). Materials of higher dielectric constant store more surface charge. We compare our results with previous calculations and with existing experimental work. ©1998 American Institute of Physics.
History: Received 10 September 1997; accepted 5 March 1998
Permalink: http://link.aip.org/link/?JAPIAU/83/5870/1
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KEYWORDS and PACS

Keywords
PACS
  • 73.25.+i
    Electronic structure and electrical properties of surfaces, interfaces, and thin films Surface conductivity and carrier phenomena
  • 77.22.Jp
    Dielectrics, piezoelectrics, and ferroelectrics and their properties Dielectric properties of solids and liquids Dielectric breakdown and space-charge effects
  • YEAR: 1998

PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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