光导开关工作模式与偏置电压的关系

通过建立半绝缘 Ga As光导开关 (PCSS's)的瞬态二维模型 ,获得了不同偏置条件下器件内电场、电流密度等电参量的空间分布及器件中最大电场和输出电流随时间的变化关系 .所获得的主要特性与实验观察到的现象和变化规律相符 :当偏置电压较低时 ,器件工作于线性模式 ;当偏置电压达到某一数值后 ,通过器件的电流呈现出非线性的传导特性 .并阐述了器件的工作模式与偏置电压的关系 ,解释了不同偏置电压下呈现不同工作模式的主要原因及物理本质

Dependence of Operational Modes of PCSSs on Bias Voltage

The spatial distribution of the electric field and current density in Photoconduetive Semiconductor Switches(PCSSs) are obtained by using 2-D transient modeling,as well as the time dependence of the maximum field and the current through the devices.The main characteristics obtained agree with the experimental observations.The devices operate in linear mode when a low bias voltage is applied to the devices;while nonlinear characteristics will occur if the bias voltages is higher than the given value.The relation between the operational modes and the bias voltage is demonstrated in detail.The causes and the physics of the existeme of different modes under the diffe- rent bias voltage are also explained.