Polarity effect of breakdown characteristics across micrometer‐scale surface gap
Polarity effect of breakdown characteristics across micrometer‐scale surface gap
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DOI：
10.1002/eej.23316
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发表时间：
2020-12
影响因子：
0.4
通讯作者：
H. Iwabuchi;T. Oyama;A. Kumada;K. Hidaka
中科院分区：
文献类型：
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作者：
H. Iwabuchi;T. Oyama;A. Kumada;K. Hidaka
随着电气设备的小型化，电极之间的间隙变得越来越小。为了优化绝缘设计，了解微米级间隙的击穿现象至关重要。在这项研究中，基于实验和数值模拟研究了微米级间隙的击穿特性。结果表明，施加正电压时的击穿电压比施加负电压时的击穿电压高1.5倍。极性效应可以通过初始电子的来源来解释。在负电压施加下，根据 Fowler-Nordheim 方程，初始电子从阴极表面发射。另一方面，在正电压施加下，绝缘体对击穿电压起着重要作用。
With a miniaturization of electrical devices, the gap between electrode becomes lower and lower. In order to optimize the insulation design, the understanding of breakdown phenomenon across micrometer‐scale gap is essential. In this study, breakdown characteristics across micrometer‐scale gap was investigated based on experiment and numerical simulation. The result shows that the breakdown voltage under positive voltage application is 1.5 times higher than the one under the negative voltage application. The polarity effect can be explained by the source of initial electrons. Under negative voltage application, the initial electrons are emitted from the cathode surface based on Fowler‐Nordheim equation. On the other hand, under positive voltage application, the insulator plays an important role on breakdown voltage.