Cesiated thin-film field-emission microcathode arrays

The effect of adsorbed cesium on the performance of thin-film field-emission microcathode arrays with molybdenum tips is discussed. A reduction in the voltage required to extract an average of 1 nA per tip from 50 to 15 V is reported. Cesiated arrays have exhibited stable performance when operated c...

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Bibliographic Details
Published in:Applied physics letters 1992-08, Vol.61 (8), p.997-999
Main Authors: MACAULAY, J. M, BRODIE, I, SPINDT, C. A, HOLLAND, C. E
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Interfaces
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:The effect of adsorbed cesium on the performance of thin-film field-emission microcathode arrays with molybdenum tips is discussed. A reduction in the voltage required to extract an average of 1 nA per tip from 50 to 15 V is reported. Cesiated arrays have exhibited stable performance when operated continuously for up to 650 h at array current densities up to 100 A/cm2, with minimal leakage current. Using the Fowler–Nordheim theory, analysis of current-voltage characteristics of a heavily cesiated emitter array gives values for the emitting area, work function, and geometrical factor.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.107699