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Photoelectron Emission Mechanism From Hydrogen Terminated Nano-Crystalline Diamond

Published online by Cambridge University Press:  01 February 2011

Daisuke Takeuchi ,
Kazuhiko Saeki ,
Christoph Erwin Nebel ,
Satoshi Yamasaki  and
Oliver Aneurin Williams
Daisuke Takeuchi
Affiliation:
d.takeuchi@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Nanotechnology Research Institute, AIST TC2-13,, 1-1-1 Umezono, Tsukuba, 305-8568, Japan, +81-29-861-5634, +81-29-861-2773
Kazuhiko Saeki
Affiliation:
saekik01@pref.tochigi.jp, Industiral Technology Center of Tochigi Prefecture, Utunomiya, 321-3224, Japan
Christoph Erwin Nebel
Affiliation:
christoph.nebel@aist.go.jp, AIST, Diamond Research Center, Tsukuba, 305-8568, Japan
Satoshi Yamasaki
Affiliation:
s-yamasaki@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Nanotechnology Research Institute (NRI), AIST TC2-13,, 1-1-1 Umezono, Tsukuba, 305-8568, Japan
Oliver Aneurin Williams
Affiliation:
oliver.williams@uhasselt.be, University of Hasselt, Institute for Materials Research (IMO), Diepenbeek, B-3590, Belgium
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Abstract

We investigated the electron affinity on hydrogen-terminated nano- (NCD) and ultranano-crystalline diamond (UNCD) films to reveal influences of defects, sp2 and grain boundaries on photoemission properties. To compare properties, single crystalline IIa diamond, optical grade poly-, nano-, ultranano-crystalline diamond films, a diamond-like carbon film, a highly oriented pyrolytic graphite have been characterized. All hydrogen terminated SCD, PCD and NCD samples show continuous sub-band yield, arising at about 4.4 eV, regardless of their crystal and/or grain sizes, while UNCD, DLC, and HOPG do not show the specific photoemission in the regime hν < 6 eV. Note that the UNCD film grown with some amount of hydrogen in the gas phase (UNCD-H) shows a comparable yield spectrum as hydrogen-terminated SCD. According to the normalized spectra, obviously, the electron emission mechanism on hydrogen-terminated NCD films is the same as that of SCD with a NEA of -1.1 eV. The sub-band yield from NCD is even larger than that of SCD, which is attributed to surface enlargement.

Keywords

diamondphotoemissionH
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 956: Symposium J – Diamond Electronics—Fundamentals to Applications , 2006 , 0956-J11-05
Copyright
Copyright © Materials Research Society 2007

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