Analysis of Effective Field Emitting Angle for Spindt Cathode

Effective field emitting angle plays an important role when investigating field emission characters. In this work, effective field emitting angle is introduced for Spindt-type emitter to relate spatial variation of current density along tip's surface to emission current. The effects of various...

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Bibliographic Details
Published inKey engineering materials Vol. 645-646; pp. 1038 - 1042
Main Authors Li, Nan Nan, Pang, Shu Cai, Yan, Fei, Jin, Da Zhi, Xiang, Wei, Zhang, De, Dai, Jin Yi, Zeng, Bao Qing
Format Journal Article
LanguageEnglish
Published 01.05.2015
Subjects
Apertures
Electric potential
Emission
Emittance
Field emission
Gates
Insulators
Trends
Voltage
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Summary:Effective field emitting angle plays an important role when investigating field emission characters. In this work, effective field emitting angle is introduced for Spindt-type emitter to relate spatial variation of current density along tip's surface to emission current. The effects of various parameters on effective field emitting angle are analyzed. The results show that effective field emitting angle decreases exponentially as half angle increases, decreases quadratically as radius of gate aperture increases, but increases logarithmically as gate voltage increases linearly. It is also found that effective field emitting angle increases first and then decreases with emitter's height increasing. Similar trends can be also found with insulator height. Grid thickness nearly has no effect on the effective field emitting angle.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1013-9826
1662-9795
DOI:10.4028/www.scientific.net/KEM.645646.1038