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Field emission properties of nano-structured phosphorus-doped diamond

: Yamada, T.; Nebel, C.E.; Shikata, S.-i.


Applied surface science 256 (2009), No.4, pp.1006-1009
ISSN: 0169-4332
Vacuum and Surface Sciences Conference of Asia and Australia (VASSCAA) <4, 2008, Matsue>
Journal Article, Conference Paper
Fraunhofer IAF ()
diamond; field emission; nanofabrication; electron affinity; field enhancement

Nano-structured phosphorus-doped diamonds were fabricated for field emitters and their field emission properties were characterized. Two kinds of nano-structures were prepared; tip array structures and whiskers on tip structures. The tips, which have 100 nm radius and 10 µm height, are used in tip array structures; whiskers have tip radii of 5 nm and height of 500 nm. Following nano-structure formation, a reduction of threshold fields is observed compared to non-patterned flat surfaces. This is ascribed to field concentration at the tips. However, at higher electric fields, a saturation of the emission current is observed due to non-negligible bulk resistances in tips and whiskers.