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本文用表面电位测试技术研究了固体介质在强电场作用下陷阱捕获电荷的动力学特性.作者在考虑了碰撞电离退陷阱化后,获得的一级捕获动力学方程,定性地解释了电荷的捕获随施加电场的时间而变化的关系和捕获电荷稳态值随电场的增强而下降的现象。利用这个动态平衡模方程,经实验分析表明:这种捕获电荷稳态值随电场的增强而下降的现象是由于自由电子与陷阱化电子碰撞电离退陷阱化的结果,而不是陷阱化电子隧道效应或Poole-Frenkel效应的结果。当电场增强使碰撞电离退陷阱化达到一定程度时,介质便发生击穿。
In this paper, the surface potential test technique was used to study the dynamic characteristics of trapping charge under the action of a strong electric field in solid media. The first-order kinetic equation of capture obtained after the impact ionization de-trapping was taken into account and qualitatively explained the charge trapping Changes with the time of the applied electric field and the phenomenon that the steady charge of the trapped charge decreases with the increase of the electric field. The experimental results show that the steady-state trapped charge decreases with the enhancement of electric field due to the depolarization of free electrons and trapping electrons, rather than the trapping electron tunneling effect Or Poole-Frenkel effect. When the electric field is enhanced so that the collision ionization back to trap to a certain extent, the dielectric breakdown occurs.