Mechanism of Field Emission from Carbon Systems

John ROBERTSON  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.5   pp.787-796
Publication Date: 2003/05/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Field Electron Emission from Carbon Materials)
Category: 
Keyword: 
diamond,  diamond-like carbon,  carbon nanotubes,  field emission,  displays,  

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Summary: 
Electron field emission from diamond, diamond-like carbon, carbon nanotubes and nano-structured carbon is compared. It is found that in all practical cases, emission occurs from regions of positive electron affinity with an emission barrier of 5eV, the work function, and with a large field enhancement. The field enhancement in nanotubes arises from their geometry. In diamond, the field enhancement occurs by depletion of grain boundary states. In diamond-like carbon we propose that it occurs by the presence of sp2-rich channels formed by the soft conditioning process.