Thermally assisted tunnelling in polyimide film under steady-state and transient conditions
- 11 June 1973
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 6 (9) , 1093-1104
- https://doi.org/10.1088/0022-3727/6/9/314
Abstract
Electrical conduction in `Kapton' polyimide film is studied under both transient and steady-state conditions. An exponential dependence of the current on the square root of the applied voltage is reported under fast transient conditions (80 μs-2 ms). The coefficient of this dependence is found to be temperature- and time-independent over the range 150-275°C. The DC conduction shows a similar field dependence, but the coefficient is expressed as two factors, one of which is temperature-independent. Evidence is presented to suggest that the DC conduction could be associated with a mechanism of thermally assisted tunnelling, and that the transient conduction could involve tunnelling of electrons between conduction-band-tail states in the insulator.Keywords
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