Current-voltage characteristics of nonplanar cold field emitters

被引:19
作者
Edgcombe, CJ [1 ]
Johansen, AM
机构
[1] Univ Cambridge, Dept Phys, Cambridge CB3 0HE, England
[2] Granta Elect Ltd, Cambridge CB3 7PR, England
[3] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B | 2003年 / 21卷 / 04期
关键词
D O I
10.1116/1.1591748
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Conventional Fowler-Nordheim theory assumes that the emitter is planar, while most tips used in practice have curved emitting surfaces. Using a revised potential distribution, standard image theory and a dimensionless parameter x, we express the experimental current as a multiple sigma of the current calculated using standard free-electron supply. A plot of sigma(x) for one carbon emitter shows a maximum at a value of x corresponding to the known emitter radius. The calculated field strength at the emitter surface varies little with x. The values found for sigma are sensitive to the accuracy of calculation and, to test the theory further, it is desirable both to improve the modelling of image effects and to obtain measurements of current-voltage characteristics and emitting radii together for more types of emitter. (C) 2003 American Vacuum Society.
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页码:1519 / 1523
页数:5
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