Low-temperature magnetoresistance study of electrical transport in N- and B-doped ultrananocrystalline and nanocrystalline diamond films

Nesladek, M., Tromson, D., Bergonzo, P., Hubik, P., Mares, J. J., Kristofik, J., Kindl, D., Williams, Oliver Aneurin ORCID: https://orcid.org/0000-0002-7210-3004 and Gruen, D. 2006. Low-temperature magnetoresistance study of electrical transport in N- and B-doped ultrananocrystalline and nanocrystalline diamond films. Diamond and Related Materials 15 (4-8) , pp. 607-613. 10.1016/j.diamond.2005.11.001

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Abstract

In this paper, we discuss the transport mechanism in nitrogen-doped ultrananocrystalline (N-UNCD) and B-doped nanocrystalline (B-NCD) diamond thin films, which have recently attracted significant attention due to possible applications in electronics and bioelectronics. We present clear evidence that the transport in UNCD films at LHeT has low-dimensional quantum character and can be explained by a weak localisation (WL) model. Our model explains the negative magnetoresistance, observed in these films for the first time, and confirms the WL phenomena. For comparison, we have prepared thin B-NCD films, doped by B using TMB. Films with thickness of about 150 nm deposited on glass wafers are fully transparent and highly conductive. B-concentrations close to the Metal Insulating Transition (MIT) are confirmed by Raman measurements. We discuss the positive magnetoresistance data observed also for the first time in B-NCD films and compare the transport mechanism with UNCD films.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Uncontrolled Keywords:	U-NCD; NCD; Doping; Low-temperature transport; Weak localisation
Additional Information:	Proceedings of Diamond 2005, the 16th European Conference on Diamond, Diamond-Like Materials, Carbon Nanotubes, Nitrides & Silicon Carbide
Publisher:	Elsevier
ISSN:	0925-9635
Last Modified:	21 Oct 2022 08:42
URI:	https://orca.cardiff.ac.uk/id/eprint/34151

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