Electrical 1/f noise in insulating polymers

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Abstract
Electrical noise measurments have been made on thin films of PS, PE, and PET, over the frequency range 10−4–1 Hz, the temperature range 20–80 °C, and under applied fields up to destructive breakdown. The noise power is found to be less than the measurable limit of 10−29 A2/Hz until near‐breakdown fields are applied, at which time a rapid increase in noise is observed with noise‐power spectra varying with frequency as 1/fα, with 1.3<α<1.7, and proportional to the square of the steady current. Very similar characteristics were observed in all three polymers. We give a tentative explanation for this high‐field phenomenon in terms of the activation of sensitive spots, thermal runaway, and subsequent annealing.

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