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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/12230

Title: Separation of intra- and intergranular magnetotransport properties in nanocrystalline diamond films on the metallic side of the metal-insulator transition
Authors: JANSSENS, Stoffel
POBEDINSKAS, Paulius
Vacik, J.
Petrakova, V.
RUTTENS, Bart
D'HAEN, Jan
NESLADEK, Milos
HAENEN, Ken
WAGNER, Patrick
Issue Date: 2011
Publisher: IOP PUBLISHING LTD
Citation: NEW JOURNAL OF PHYSICS, 13
Abstract: A systematic study on the morphology and electronic properties of thin heavily boron-doped nanocrystalline diamond (NCD) films is presented. The films have nominally the same thickness (approximate to 150 nm) and are grown with a fixed B/C ratio (5000 ppm) but with different C/H ratios (0.5-5%) in the gas phase. The morphology of the films is investigated by x-ray diffraction and atomic force microscopy measurements, which confirm that lower C/H ratios lead to a larger average grain size. Magnetotransport measurements reveal a decrease in resistivity and a large increase in mobility, approaching the values obtained for single-crystal diamond as the average grain size of the films increases. In all films, the temperature dependence of resistivity decreases with larger grains and the charge carrier density and mobility are thermally activated. It is possible to separate the intra- and intergrain contributions for resistivity and mobility, which indicates that in these complex systems Matthiessen's rule is followed. The concentration of active charge carriers is reduced when the boron-doped NCD is grown with a lower C/H ratio. This is due to lower boron incorporation, which is confirmed by neutron depth profiling.
Notes: [Janssens, SD; Pobedinskas, P; Ruttens, B; D'Haen, J; Nesladek, M; Haenen, K; Wagner, P] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium [Vacik, J] Acad Sci CR, Inst Nucl Phys, Vvi, Husinec Rez 25068, Czech Republic [Vacik, J] Res Ctr Rez, Husinec Rez 25068, Czech Republic [Petrakova, V] Acad Sci CR, Inst Phys, Vvi, Prague 16253 6, Czech Republic [Petrakova, V] Czech Tech Univ, Fac Biomed Engn, Kladno 27201 2, Czech Republic [Ruttens, B; D'Haen, J; Nesladek, M; Haenen, K; Wagner, P] IMEC VZW, IMOMEC, B-3590 Diepenbeek, Belgium sdjansse@gmail.com; ken.haenen@uhasselt.be
URI: http://hdl.handle.net/1942/12230
DOI: 10.1088/1367-2630/13/8/083008
ISI #: 000294671600001
ISSN: 1367-2630
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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