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Palladium-defect complexes in diamond and silicon carbide

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Abstract

Time Differential Perturbed Angular Correlations (TDPAC) studies, supported by Density Functional Theory (DFT) modelling, have shown that palladium atoms in silicon and germanium pair with vacancies. Building on these results, here we present DFT predictions and some tentative TDPAC results on palladium-defect complexes and site locations of palladium impurities in diamond and silicon carbide. For both diamond and silicon carbide, the DFT calculations predict that a split-vacancy V-PdBI-V complex is favoured, with the palladium atom on a bond-centred interstitial site having a nearest-neighbour semi-vacancy on either side. Consistent with experimental results, this configuration is also assigned to palladium complexes in silicon and germanium. For silicon carbide, the DFT modelling predicts furthermore that a palladium atom in replacing a carbon atom moves to a bond-centred interstitial site and pairs with a silicon vacancy to form a complex that is more stable than that of a palladium atom which replaces a silicon atom and then moves to a bond-centred interstitial site pairings with a carbon vacancy. These two competing alternatives differ by 8.94 eV. The favourable pairing with a silicon vacancy is also supported independently by TRIM Monte Carlo calculations, which predict that more silicon vacancies than carbon vacancies are created during heavy ion. implantation.

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Authors and Affiliations

  1. School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Canberra, PO Box 7916, Canberra, BC, 2610, Australia

    A. A. Abiona, W. Kemp & H. Timmers

  2. Physics Department, Durban University of Technology, Durban, 4000, South Africa

    K. Bharuth-Ram

Authors
  1. A. A. Abiona
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  2. W. Kemp
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  3. H. Timmers
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  4. K. Bharuth-Ram
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Correspondence to A. A. Abiona.

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Proceedings of the 5th Joint International Conference on Hyperfine Interactions and International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2014) Canberra, Australia, 21-26 September 2014

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Abiona, A.A., Kemp, W., Timmers, H. et al. Palladium-defect complexes in diamond and silicon carbide. Hyperfine Interact 230, 115–122 (2015). https://doi.org/10.1007/s10751-014-1099-3

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