Positron annihilation study for enhanced nitrogen-vacancy center formation in diamond by electron irradiation at 77 K

Journal Article · Mon Apr 28 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4872243· OSTI ID:22267756

Chiba, T.; Nagai, Y.; Inoue, K.; Toyama, T.; Hasegawa, M. ^[1]

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1. Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)

A compact ensemble of high density nitrogen-vacancy (NV) centers in diamond is essential to sense various external fields with a high precision at the nanoscale. Here, defects in type IIa and type Ib diamonds induced by 28 MeV electron irradiation at 77 K were studied by combining the positron annihilation spectroscopy and first-principles calculations. It is shown that the electron irradiation at 77 K can significantly enhance the NV center formation by directly converting 24% vacancies into the NV centers, indicating that it is an efficient way to produce the high density NV centers in the type Ib diamond.

• OSTI ID: 22267756
• Journal Information: Applied Physics Letters, Vol. 104, Issue 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNIHILATION
DIAMONDS
ELECTRONS
NANOSTRUCTURES
NITROGEN
POSITRONS
VACANCIES