强激光与粒子束, 2013, 25 (9): 2471, 网络出版: 2013-08-28
正对电极结构碳化硅光导开关的电路模型
Circuit modeling of vertical geometry SiC photoconductive semiconductor switches
光导开关 半导体模型 PSpice模型 电路参数 photoconductive semiconductor switch semiconductor model PSpice model exterior electric parameter
摘要
利用SilvacoTCAD软件,在532 nm激光辐照下,对正对电极结构6HSiC光导开关(SiCPCSS)瞬态电流电场的分布及不同光功率下的伏安特性进行了仿真。结果表明:载流子速率在强场下达到饱和,并且电流电场在主要电流区域沿垂直于激光辐照方向均匀分布。提出SiCPCSS电路模型的建模依据,可以近似条件化简得到PCSS电阻一般表达式的解,建立SiCPCSS载流子迁移率随电场变化的PSpice模型,分析讨论了外电路参数对SiCPCSS导通过程的影响。该模型模拟结果与已有实验结果吻合良好。
Abstract
Compact vertical geometry photoconductive semiconductor switches (PCSS) made from SiC are promising candidates for high power switching. Silvaco TCAD is used to simulate the timeresolved electric field current distribution and voltampere characteristics of different light power in vertical geometry Vdoped semiinsulated 6HSiC photoconductive switches excited by 532 nm laser. The simulation shows that the carriers drift velocity with increasing field saturates at a constant velocity, and the timeresolved electric field current is uniformly distributed along the major electric field current direction that is perpendicular to laser incidence direction. With the simplification of semiconductor equations based on the Silvaco TCAD simulations, a SiCPCSS circuit model has been developed in consideration of carrier field dependent mobility. With the help of the validation in reported experiment, the influence of exterior electric parameters is discussed by using the SiCPCSS circuit model.
王朗宁, 荀涛, 杨汉武. 正对电极结构碳化硅光导开关的电路模型[J]. 强激光与粒子束, 2013, 25(9): 2471. Wang Langning, Xun Tao, Yang Hanwu. Circuit modeling of vertical geometry SiC photoconductive semiconductor switches[J]. High Power Laser and Particle Beams, 2013, 25(9): 2471.