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Negative Resistance and Current Oscillation Phenomena in Oriented Polypropylene Films

The conduction characteristics in oriented polypropylene (OPP) film were studied over field intensities between 10 and 300 MV/m and a range of temperature from 5 to 55 C. The range of the conduction characteristics observed at 15 C was divided into five regions with increasing field intensity. Particularly, in the region from 70 to 82 MV/m voltage-controlled negative resistance was displayed. In the negative resistance region, current oscillations were also observed and the mobility of carriers was 1.44 {times} 10{sup {minus}13} m{sup 2}/V s. The negative resistance characteristics could be explained by Gibbons` theory.