强激光与粒子束, 2005, 17 (6): 913, 网络出版: 2006-04-28   

轴对称平板二极管空间电荷限制流的2维效应

Two-dimensional geometry effect on space-charge-limited current in axially symmetrical planar diode
作者单位
西安交通大学电子物理与器件教育部重点实验室,陕西,西安,710049
摘要
应用精度较高的体积加权电荷、电流分配模型,对轴对称平板二极管的空间电荷限制流2维效应进行了粒子模拟研究.选取电压分别为100 kV和1 MV两种情况,对空间电荷限制流受二极管尺寸影响的规律进行了模拟.模拟结果表明,2维效应使空间电荷限制流密度随二极管形状因子(阴极发射半径与阴阳极间隙的比值)的减小而增大,且受相对论效应的影响不明显.经数值拟合得到了空间电荷限制流2维效应与形状因子相关的二阶经验公式,其一阶系数与一阶理论结果基本一致,约为1/4.
Abstract
Two-dimensional (2-D) geometry effect on space-charge-limited(SCL) current of an axially symmetrical planar diode was studied with 2.5 D particle-in-cell(PIC) simulation. A volume-weighting cloud-in-cell model was used to improve the accuracy of the PIC method in z-r coordinates system. The simulations with various emitter radii were carried out on the same diode with the applied voltages being 100 kV and 1 MV respectively. The simulation results show that the 2 D geometry effect on SCL current monotonically diminishes with the dimensionless ratio of emitter radius to gap separation, whether in relativistic or non-relativistic regime. When the ratio is more than 0.5, the first-order analytical theory well predicts the limiting current. But when the ratio is no more than 0.5, the second-order correction must be considered.

李永东, 何锋, 刘纯亮. 轴对称平板二极管空间电荷限制流的2维效应[J]. 强激光与粒子束, 2005, 17(6): 913. LI Yong-dong, HE Feng, LIU Chun-liang. Two-dimensional geometry effect on space-charge-limited current in axially symmetrical planar diode[J]. High Power Laser and Particle Beams, 2005, 17(6): 913.

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