Effect of aspect ratio and anode location on the field emission properties of a single tip based emitter

Smith, R. C.; Carey, J. D.; Forrest, R. D.; Silva, S. R. P.

doi:doi:10.1116/1.1880072

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Journal of Vacuum Science & Technology B / Volume 23 / Issue 2 / PAPERS FROM THE 17TH INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE / Theory, Modeling and Simulation of Field Emitters

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J. Vac. Sci. Technol. B 23, 632 (2005); http://dx.doi.org/10.1116/1.1880072 (4 pages)

Effect of aspect ratio and anode location on the field emission properties of a single tip based emitter

R. C. Smith, J. D. Carey, R. D. Forrest, and S. R. P. Silva

Nanoelectronics Centre, Advanced Technology Institute, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom

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(Published online 6 April 2005)

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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+ math

)^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.

ACKNOWLEDGMENTS

The authors would like to thank the EPSRC Portfolio Partnership and Carbon Based Electronics programs for funding this research.

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KEYWORDS and PACS

Keywords

electron field emission, anodes, cathodes, vacuum microelectronics

PACS

79.70.+q

Field emission, ionization, evaporation, and desorption
85.45.Db

Field emitters and arrays, cold electron emitters

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History

Received 24 September 2004
Accepted 31 January 2005
Published online 6 April 2005

Digital Object Identifier

http://dx.doi.org/10.1116/1.1880072

PUBLICATION DATA

ISSN

0734-211X (print)

Publisher

American Vacuum Society

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