Self-Healing Breakdown at Spherulite Boundaries of Polyethylene Thin Films

概要

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A polyethylene (PE) thin film consisting of two-dimensional spherulites of thickness 0.7-1.4 μm are prepared with heat treatment of a solution-grown film. Most breakdown measurements are made on the Al(top)-PE-Al(base) systems with ramp voltages at rising speeds of 10^2, 10^4 and 10^6 Vs^<-1> at room temperature. Breakdown occurs mostly at the boundaries between the spherulites. At 10^6 Vs^<-1> the electric strength when the top electrode is a cathode and is smaller than that in the base cathode case, while at 10^2 Vs^<-1> they are nearly identical irrespective of the polarity. In the base cathode case, the rising speed of 10^6 Vs^<-1> yields a larger electric strength than that of 10^2 Vs^<-1> .These results are interpreted in terms of roughness of the top surface and space charge formation. The results on the Au-PE-Al and Al-PE-Au systems are also consistent with the above interpretation. Decay of the space charges are also discussed.
社団法人応用物理学会の論文
1981-01-05