Space charge limited currents in polymers

Κryszewski, M.; Szymański, A.

doi:10.1002/pol.1970.230040105

Cited by 28 publications

(11 citation statements)

References 127 publications

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“…Although the restoring lorce in both effects is due to Coulomb interaction between the escaping electron and a positive charge, they differ in that the positive image charge is fixed for the Poole-Frenkel barriers, but mobile with Schottky emission. This results in a barrier lowering twice as large tbr the Poole-Frenckel effect [18][19] Ad~p F = (e3E/rtl3e,,) In = [3pv E l'-', (5a) is observed in the current-temperature characteristics at different applied bias voltages. Also, the data are found to give the linear fit when log(I/T 2) was plotted against (I/T) as predicted by eqn.…”

Section: Discussionmentioning

confidence: 87%

“…Further, the non-linear variation of current with V:O 5 film thickness at a constant voltage and temperature (Fig. 2) suggests that the possibility of space charge limited current conduction in AI/V2Os/AI microdevices is also ruled out since the theory of space charge limited conduction mechanism predicts a linear variation of current with film thickness at a constant voltage and temperature [18]. The linear fit of the data when the current is plotted against the inverse square root of V205 film thickness indicates the possibility of current by the electrode limited process.…”

Section: Discussionmentioning

confidence: 94%

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Electrical transport mechanism in Al/V2O5/Al microdevices

Ramana

Naidu

Hussain

et al. 2001

Ionics

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Abstract. The current-voltage characteristics of metal-insulator-metal microdevices fabricated with electron-beam evaporated vanadium pentoxide films have been studied in order to understand the electrical transport mechanism in these films. The dependence of transport properties on various factors such as film thickness, substrate temperature, and applied field, has been established. The results revealed that the electrical transport follows a Schottky-type mechanism at lower electrical fields and a Poole-Frenkel-type at higher electrical fields than 2x106 V/m.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 94%

Electrical transport mechanism in Al/V2O5/Al microdevices

Ramana

Naidu

Hussain

et al. 2001

Ionics

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“…This suggests that the chain ends of the PVCz act as shallow traps, so that N, is related to the number of chain ends as Kryszewski suggested. 9 Traps can be formed not only physically but chemically as well. Iodine was chosen as a chemical impurity and may form a trap in PVCz.…”

Section: Resultsmentioning

confidence: 99%

Switching in Poly-N-vinylcarbazole Thin Films Effect of Molecular Weight and Impurities

Sakai

Sadaoka

Okada

1983

Polym J

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ABSTRACT:In order to elucidate the trapping sites which serve an important role in the switching of poly-N-vinylcarbazole (PVCz), the effects of the molecular weight and the method of polymerization on the threshold voltage of switching was studied. The trap density was also determined from the threshold voltage. Polymerization was initiated by ()(,1)('-azobisisobutyronitrile (AIBN) or y-ray irradiation. The trap density was larger for lower molecular weight PVCz than for higher molecular weight materials. PVCz prepared by AIBN initiator had a trap density larger than that made by y-ray initiation when both polymers had the same molecular weight. Doping of iodine onto PVCz increased the trap density; however, doping of tetramethyl-p-phenylenediamine or 1,5-diaminonaphthalene had no such effect. Heat treatment ofPVCz seemed to have some effect on the switching characteristics.KEY WORDS Poly-N-vinylcarbazole

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“…According to the SCLC theory [2] the density of the conduction current is described by the following dependence:…”

Section: Current-voltage Dependencementioning

confidence: 99%

“…suggests the presence of space-charge-limited currents. If the generation process decides about electrical conduction through the dielectric film, then, assuming that it is for instance the Schottky mechanism or a simple Poole-Frenkel mechanism2), the current density dependence for both cases may be generally expressed as (2) In…”

Section: Current-voltage Dependencementioning

confidence: 99%

On Differentiation of Electrical Conduction Processes in Polymers

Tyczkowski

Czeremuszkin

Κryszewski

1982

phys. stat. sol. (a)

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It is demonstrated that the investigation of the dependences of conductivity current on applied voltage and on polymer film thickness does not suffice to distinguish between the generation processes and SCL transport. It is suggested that such differentiation can be achieved by measurements of photoinjection carriers from a metal into a polymer, and the conductivity of the plasma polymerized hexamethyldisilazane films is analysed as an example. It is shown that in this material, in the entire range of fields (up to 4 × 108 V/m) and thicknesses (0.055 to 1.5 μm) employed the dominant process is bulk generation.

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Space charge limited currents in polymers

Cited by 28 publications

References 127 publications

Electrical transport mechanism in Al/V2O5/Al microdevices

Electrical transport mechanism in Al/V2O5/Al microdevices

Switching in Poly-N-vinylcarbazole Thin Films Effect of Molecular Weight and Impurities

On Differentiation of Electrical Conduction Processes in Polymers

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