An upper limit on the lateral vacancy diffusion length in diamond

Orwa, J.O., Ganesan, K., Newnham, J., Santori, C., Barclay, P., Fu, K.M.C., Beausoleil, R.G., Aharonovich, I., Fairchild, B.A., Olivero, P., Greentree, A.D. and Prawer, S. 2012, An upper limit on the lateral vacancy diffusion length in diamond, Diamond & related materials, vol. 24, pp. 6-10, doi: 10.1016/j.diamond.2012.02.009.

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Title An upper limit on the lateral vacancy diffusion length in diamond
Author(s) Orwa, J.O.ORCID iD for Orwa, J.O.
Ganesan, K.
Newnham, J.
Santori, C.
Barclay, P.
Fu, K.M.C.
Beausoleil, R.G.
Aharonovich, I.
Fairchild, B.A.
Olivero, P.
Greentree, A.D.
Prawer, S.
Journal name Diamond & related materials
Volume number 24
Start page 6
End page 10
Total pages 5
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2012-04
ISSN 0925-9635
Keyword(s) ion implantation
vacancy diffusion
Summary Ion implantation is widely used to modify the structural, electrical and optical properties of materials. By appropriate masking, this technique can be used to define nano- and micro-structures. However, depending on the type of mask used, experiments have shown that vacancy-related substrate modification can be inferred tens of micrometers away from the edge of the mask used to define the implanted region. This could be due to fast diffusion of vacancies from the implanted area during annealing or to a geometric effect related to ion scattering around the mask edges. For quantum and single-atom devices, stray ion damage can be deleterious and must be minimized. In order to profile the distribution of implantation-induced damage, we have used the nitrogen-vacancy color center as a sensitive marker for vacancy concentration and distribution following MeV He ion implantation into diamond and annealing. Results show that helium atoms implanted through a mask clamped to the diamond surface are scattered underneath the mask to distances in the range of tens of micrometers from the mask edge. Implantation through a lithographically defined and deposited mask, with no spacing between the mask and the substrate, significantly reduces the scattering to ≤ 5 μm but does not eliminate it. These scattering distances are much larger than the theoretically estimated vacancy diffusion distance of ∼ 260 nm under similar conditions. This paper shows that diffusion, upon annealing, of vacancies created by ion implantation in diamond, is limited, and the appearance of vacancies many tens of micrometers from the edge of the mask is due to scattering effects.
Language eng
DOI 10.1016/j.diamond.2012.02.009
Field of Research 020406 Surfaces and Structural Properties of Condensed Matter
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2012, Elsevier
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