Electrical breakdown strength of polypropylene film is measured with gold (Au) or aluminum (Al) evaporated electrode by applying linearly rising voltage at 100°C. The breakdown strengths strongly depended on anode metal, rather than the cathode metal. The samples with the Au anode give lower electrical breakdown strengths than those with Al anode. These experimental results are discussed in terms of the previous proposed numerical breakdown model based on the transient space-charge behavior caused by bulk-generated, electrode-injected and extraction carriers. The simulation suggested the electrical breakdown of polypropylene film at high temperature region was affected hetero-space charge formation at the anode, which is consisted of the carrier injection carriers from cathode, migrated to anode. The height of interfacial potential barriers between anode and film strongly influenced the formation of hetero-space charge through the carrier extraction to the anode, leading to the results that, electrical breakdown strengths of polypropylene film are strongly affected by anode metal rather than cathode metal.
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