Abstract
The charging of non-polymer capacitors due to a step voltage is studied as a function of time. Apart from the classical charging, which is completed in nanoseconds, it is found that the current flowing into the capacitor can be described as a sum of two exponential functions of time, the time constants differing by a factor of ten or more. In the case of polyethylene, at least, it is clear that the shorter time constant is connected with carrier injection into the polymer from the metal surface. The longer time constant is presumably due to carrier migration within the volume of the dielectric. These findings may be correlated with our previous results on the field dependence of electrostatic charging and support the model of carrier injection to a finite depth.
Published Version
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