The Poole-Frenkel effect in a dielectric under nanosecond irradiation by an electron beam with moderate or high current density

D. I. Vaisburd, K. E. Evdokimov

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Processes of electron trapping and detrapping determine in many respects intense processes arising in dielectric and delayed by 1-100 ns from the irradiation pulse of a high-power electron beam, such as electron emission, electric discharge in the bulk of the dielectric, flashover, and electric breakdown. A model of charged donor center ionization in a dielectric exposed to a strong electric field is constructed. The model takes into account 1) the energy spectrum of the charged donor center in the dielectric, 2) the semiclassical state density in the donor center, 3) spontaneous emission of phonons by the electron localized in the donor center, 4) increase in the kinetic energy of the electron (heating) in the external electric field, 5) electron tunneling through a potential barrier and its reflection from the barrier depending on the external field intensity, and 6) thermal fluctuations of energy of the electron localized in the donor center. The probability of charged donor center ionization in the dielectric per unit time is calculated. In weak fields, the field dependence of the ionization probability almost coincides with that for the Poole-Frenkel theory. In strong fields, the contribution of electron heating to the external electric field is the deciding factor.

Original languageEnglish
Pages (from-to)1255-1261
Number of pages7
JournalRussian Physics Journal
Volume51
Issue number12
DOIs
Publication statusPublished - Dec 2008

Fingerprint

high current
electron beams
current density
irradiation
electrons
ionization
electric fields
flashover
heating
electric discharges
electron tunneling
electron emission
spontaneous emission
phonons
energy spectra
breakdown
kinetic energy
trapping
pulses
energy

Keywords

  • Dielectrics
  • Donor center ionization
  • Intense electron beams
  • Thermal fluctuations
  • Tunneling

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

The Poole-Frenkel effect in a dielectric under nanosecond irradiation by an electron beam with moderate or high current density. / Vaisburd, D. I.; Evdokimov, K. E.

In: Russian Physics Journal, Vol. 51, No. 12, 12.2008, p. 1255-1261.

Research output: Contribution to journalArticle

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