Indirect overgrowth as a synthesis route for superior diamond nano sensors.

Abstract:

:The negatively charged nitrogen-vacancy ([Formula: see text]) center shows excellent spin properties and sensing capabilities on the nanoscale even at room temperature. Shallow implanted [Formula: see text] centers can effectively be protected from surface noise by chemical vapor deposition (CVD) diamond overgrowth, i.e. burying them homogeneously deeper in the crystal. However, the origin of the substantial losses in [Formula: see text] centers after overgrowth remains an open question. Here, we use shallow [Formula: see text] centers to exclude surface etching and identify the passivation reaction of NV to NVH centers during the growth as the most likely reason. Indirect overgrowth featuring low energy (2.5-5 keV) nitrogen ion implantation and CVD diamond growth before the essential annealing step reduces this passivation phenomenon significantly. Furthermore, we find higher nitrogen doses to slow down the NV-NVH conversion kinetics, which gives insight into the sub-surface diffusion of hydrogen in diamond during growth. Finally, nano sensors fabricated by indirect overgrowth combine tremendously enhanced [Formula: see text] and [Formula: see text] times with an outstanding degree of depth-confinement which is not possible by implanting with higher energies alone. Our results improve the understanding of CVD diamond overgrowth and pave the way towards reliable and advanced engineering of shallow [Formula: see text] centers for future quantum sensing devices.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Findler C,Lang J,Osterkamp C,Nesládek M,Jelezko F

doi

10.1038/s41598-020-79943-2

subject

Has Abstract

pub_date

2020-12-29 00:00:00

pages

22404

issue

1

issn

2045-2322

pii

10.1038/s41598-020-79943-2

journal_volume

10

pub_type

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