非线性光导开关快速导通特性

The Rapid Turn-on Characteristics in Nonlinear Photoconductive Semiconductor Switches

非线性光导半导体开关的快速导通过程总是伴有电流丝的形成 ,基于电流丝形成的雪崩碰撞引起的粒子束放电机制的假定 ,考虑到载流子寿命、光吸收深度、碰撞电离系数以及初始载流子浓度等因素的影响 ,从理论上分析了非线性光导开关雪崩导通的物理过程和导通特性 ,得到了一些与实验观测结果吻合得很好的结论 ,提出了一些有利于改善和控制非线性光导开关的工作特性的可行手段。

The\} rapid turn\|on process of nonlinear photoconductive semiconductor switch is always associated with the formation of filamentary current. Some turn on characteristics of nonlinear photoconductive semiconductor switches are analyzed based on the assumption that the mechanism of the turn on in photoconductive semiconductor switches is the streamer discharge. The results, with carrier lifetime, optical absorption length, impact ionization coefficient, initial carrier concentration considered, fit with the experimental results well. This discussion corroborates the assumption and is helpful to the full understanding of the physical processes occurred in nonlinear PCSS. Some methods of improving and controlling the operational characteristics of PCSS are also given.