Accession Number:

AD0716227

Title:

Dark Conduction Through Anthracene Crystals,

Descriptive Note:

Corporate Author:

QUEENSLAND UNIV BRISBANE (AUSTRALIA) DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1970-06-16

Pagination or Media Count:

18.0

Abstract:

Dark currents through anthracene crystals with silver paste electrodes were studied as functions of temperature, applied voltage, and time. Activation energies between 0.5eV and 2.9eV were measured, there being a definite correlation between log sigma0 and E the compensation effect. However, it was shown that the compensation effect arises from the calculation of sigma0 and E, and not from a true linear free-energy relationship. As simple carrier generation mechanisms were inadequate to explain the temperature-dependence results, a model involving transitions between two limiting mechanisms was invoked and developed. The voltage-dependence results are shown to arise by a transition from SCL currents at low voltages, to barrier-limited currents BLC at higher fields, where the Schottky effect controls the current-voltage response. Vindication of the choice of this model is obtained from the calculated values of the parameters epsilon, the permittivity of anthracene A, the Richardson constant phi, the surface energy barrier for hole injection from silver paste into anthracene and WEAg, the work function for silver paste electrodes. Author

Subject Categories:

  • Crystallography
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE