Effect of aspect ratio and anode location on the field emission properties of a single tip based emitter
Effect of aspect ratio and anode location on the field emission properties of a single tip based emitter
复制标题
DOI：
10.1116/1.1880072
复制
发表时间：
2005-04
影响因子：
1.4
通讯作者：
R. Smith;J. D. Carey;R. D. Forrest;S. Silva
中科院分区：
文献类型：
--
作者：
R. Smith;J. D. Carey;R. D. Forrest;S. Silva
报告了隔离发射体的纵横比以及阳极电极的位置对场致发射特性的影响。我们通过计算模拟表明，当阳极到阴极的间距 D 大于发射器距尖端高度的三倍时，场增强因子 β 仅取决于发射器高度 h、半径 r。在这种情况下，增强因子与阳极位置无关，并且接近仅由 h 和 r 描述的值，并由表达式 β0=(1+h∕αr)m 描述，其中 α=2 且 m=1。当阳极靠近发射器的尖端时，发射器尖端和阳极近似于平行板配置，并且增强因子趋于一致。提取的增强因子和阈值场由修改后的应用电场描述，以 D−h 作为间隔。还给出了与先前报道的实验结果的比较。
The effect on the field emission characteristics of the aspect ratio of an isolated emitter, together with the position of the anode electrode are reported. We show by computational simulation that the field enhancement factor β is only dependant on the emitter height h, radius r, when the anode to cathode separation D is greater than three times the height of the emitter away from the tip. In this regime the enhancement factor is independent of the anode location and approaches a value depicted by h and r alone and is described by the expression β0=(1+h∕αr)m where α=2 and m=1. As the anode is brought close to the tip of the emitter, the emitter tip and anode approximate a parallel plate configuration and the enhancement factor tends to unity. Extracted enhancement factor and threshold fields are described by a modified applied electric field taking D−h as the separation. Comparison with previously reported experimental results is also given.