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本文研究氧化锌压敏电阻在连续交变电压作用下,在不同的温度和外加电压条件下漏电流随时间变化的规律.分析了氧化锌表面耗尽区中的正离子电荷及耗尽区边界扩散长度范围内空穴电荷在晶粒表面积累的物理过程.根据实验结果,提出漏电流不稳定性的机理是锌离子在晶粒表面积累,降低了氧化锌表面肖特基势垒的高度,使漏电流上升.文中简便地推导出漏电流上升的速率方程.实验还发现外加电压的频率增高时,漏电流上升的速率增大.
In this paper, we study the regularity of the leakage current of zinc oxide varistor with time under the condition of continuous alternating voltage under different temperature and applied voltage.We analyze the positive ion charge and the depletion region boundary in zinc oxide surface depletion region According to the experimental results, the mechanism of the instability of the leakage current is proposed, in which the zinc ions accumulate on the grain surface and the height of the Schottky barrier on the zinc oxide surface is reduced, So that the leakage current is increased.The paper simply deduces the rate equation of leakage current rise.Experiments also find that when the applied voltage increases, the rate of leakage current increases.