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Title: Thermionic electron emission from low work-function phosphorus doped diamond films
Authors: Koeck, Franz A. M.
Nemanich, Robert J.
LAZEA, Andrada 
Issue Date: 2009
Source: DIAMOND AND RELATED MATERIALS, 18(5-8). p. 789-791
Abstract: Thermionic electron emitters are a key component in applications ranging from travelling wave tubes for communications, space propulsion and direct energy conversion. As the conventional approach based on metallic emitters requires high operating temperatures the negative electron affinity (NEA) characteristic of diamond surfaces in conjunction with suitable donors would allow an electronic structure corresponding to a low effective work function. We have thus prepared phosphorus-doped polycrystalline diamond films on metallic substrates by plasma assisted chemical vapor deposition where an NEA surface characteristics was induced by exposure of the film surface to a hydrogen plasma. Thermionic electron emission measurements in an UHV environment were conducted with respect to the Richardson-Dushman relation observing an emission current at temperatures <375 degrees C. Measurements were terminated at 765 degrees C without significant reduction in the electron emission current indicating a stable hydrogen passivation of the diamond surface. A fit of the emission data to the Richardson equation allowed for the extraction of emission parameters where the value of the materials work function was evaluated to 0.9 eV. This value could well be the lowest measured work function of any known material. Published by Elsevier B.V.
Notes: [Koeck, Franz A. M.; Nemanich, Robert J.] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA. [Lazea, Andrada; Haenen, Ken] Hasselt Univ, Inst Mat Res, IMO, B-3590 Diepenbeek, Belgium. [Lazea, Andrada; Haenen, Ken] IMEC VZW, Div IMOMEC, B-3590 Diepenbeek, Belgium.
Keywords: diamond; chemical vapor deposition; doping; phosphorus
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ISSN: 0925-9635
e-ISSN: 1879-0062
DOI: 10.1016/j.diamond.2009.01.024
ISI #: 000267737000023
Category: A1
Type: Journal Contribution
Validations: ecoom 2010
Appears in Collections:Research publications

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