Simulation of space charge dynamics in low-density polyethylene under external electric field and injection barrier heights using discontinuous galerkin method
Simulation of space charge dynamics in low-density polyethylene under external electric field and injection barrier heights using discontinuous galerkin method
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DOI：
10.1109/tdei.2011.6032805
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发表时间：
2011-10
影响因子：
3.1
通讯作者：
Jihuan Tian;Yuanxiang Zhou;Yunshan Wang
中科院分区：
文献类型：
--
作者：
Jihuan Tian;Yuanxiang Zhou;Yunshan Wang
本文提出了一种新的高阶精确数值方法来模拟固体介质中的空间电荷输运。它是基于一个统一的框架，不连续伽辽金（DG）方法来求解电荷集中和电场。与等效数值精度的边界元法和边界元法相比，该方法更容易实现，效率更高。利用该方法和对称模型参数，得到了低密度聚乙烯（LDPE）在不同外加电场和注入势垒高度下的空间电荷浓度和电场分布。仿真结果表明，在电场阈值以上，随时间变化的最大电场强度和总电荷量出现较大的振荡。这种现象可以被认为是与低场相比，电荷注入量相对较大的标志。当模拟中的肖特基注入势垒高度提高时，为了保持一定的载流子注入量，该电场阈值也随之增加。
In this paper, a novel high-order accurate numerical method was proposed to simulate the space charge transport in solid dielectrics. It is based on a unified framework, discontinuous Galerkin (DG) method, to solve both charge concentration and electric field. It is easier to implement and more efficient than the combined DG and boundary element method (BEM) with equivalent numerical accuracy. With this new method and symmetric model parameters for low-density polyethylene (LDPE), space charge concentration and electric field distribution under different external electric field and injection barrier heights were obtained. The simulation shows that above an electric field threshold, large oscillations appear in the time-dependent maximum electric field strength and the total charge quantity. This phenomenon can be considered as a sign of a relatively larger quantity of charge injection compared to the low field regime. When the Schottky injection barrier height in the simulation is raised, this electric field threshold also increases in order to maintain a certain amount of carrier injection.