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Time-dependent radiation-induced conductivity in electron-irradiated Teflon foils

Gross, Bernhard ; West, James E. ; von Seggern, Heinz ; Berkley, David A. :
Time-dependent radiation-induced conductivity in electron-irradiated Teflon foils.
[Online-Edition: http://dx.doi.org/10.1063/1.328323]
In: Journal of Applied Physics, 51 (9) pp. 4875-4881. ISSN 00218979
[Artikel], (1980)

Offizielle URL: http://dx.doi.org/10.1063/1.328323

Kurzbeschreibung (Abstract)

The radiation‐induced conductivity (RIC) of 2.5×10−3 ‐cm‐thick Teflon was measured using partially penetrating electrons with an energy of 40 keV. The behavior of the external currents generated during irradiation is expressed by a ’’generalized box model.’’ We explain, with this model, the experimentally observed buildup and decay of the RIC by using a time‐dependent conductivity σ(t)=σ0 (1−et/τs), where σ0 is the steady‐state conductivity and τs is the time constant of the RIC buildup. The time sequence in which voltage and irradiation are applied is found to give significantly different time effects; for irradiation first, the induced conductivity reaches a final value when the voltage is applied, while with voltage first, the conductivity increases with time after the radiation is turned on. Measurements are complex because the nonirradiated region of the foil is entirely blocking for electrons while it allows transport of holes. The peak value of the induced current, and thus of the induced conductivity, increases proportional to ‖I0‖0.79, while the initial slope of the current versus time is proportional to the electron beam current I0.

Typ des Eintrags: Artikel
Erschienen: 1980
Autor(en): Gross, Bernhard ; West, James E. ; von Seggern, Heinz ; Berkley, David A.
Titel: Time-dependent radiation-induced conductivity in electron-irradiated Teflon foils
Sprache: Englisch
Kurzbeschreibung (Abstract):

The radiation‐induced conductivity (RIC) of 2.5×10−3 ‐cm‐thick Teflon was measured using partially penetrating electrons with an energy of 40 keV. The behavior of the external currents generated during irradiation is expressed by a ’’generalized box model.’’ We explain, with this model, the experimentally observed buildup and decay of the RIC by using a time‐dependent conductivity σ(t)=σ0 (1−et/τs), where σ0 is the steady‐state conductivity and τs is the time constant of the RIC buildup. The time sequence in which voltage and irradiation are applied is found to give significantly different time effects; for irradiation first, the induced conductivity reaches a final value when the voltage is applied, while with voltage first, the conductivity increases with time after the radiation is turned on. Measurements are complex because the nonirradiated region of the foil is entirely blocking for electrons while it allows transport of holes. The peak value of the induced current, and thus of the induced conductivity, increases proportional to ‖I0‖0.79, while the initial slope of the current versus time is proportional to the electron beam current I0.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Applied Physics
Band: 51
(Heft-)Nummer: 9
Verlag: American Institute of Physics Publishing LLC.
Freie Schlagworte: FOILS, PHYSICAL RADIATION EFFECTS, ELECTRIC CONDUCTIVITY, TIME DEPENDENCE, ELECTRON BEAMS, TEFLON, DATA, KEV RANGE, MATHEMATICAL MODELS
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Elektronische Materialeigenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 13 Jun 2013 08:49
Offizielle URL: http://dx.doi.org/10.1063/1.328323
ID-Nummer: 10.1063/1.328323
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