Theory of hydrogen in diamond

Goss, J. P.School of Physics, Stocker Road, University of Exeter, Exeter, Devon, EX4 4QL, United Kingdom (författare)

Validerad; 2002; 20070219 (kani)
Ab initio cluster and supercell methods are used to investigate the local geometry and optical properties of hydrogen defects in diamond. For an isolated impurity, the bond-centered site is found to be lowest in energy, and to possess both donor and acceptor levels. The neutral defect possesses a single local mode with a very small infrared effective charge, but the effective charge for the negative charge state is much larger. H+ is calculated to be very mobile with a low activation barrier. Hydrogen dimers are stable as H2* defects, which are also found to be almost IR inactive. The complex between B and H is investigated and the activation energy for the reaction B-H→B-+H+ found to be around 1.8 eV in agreement with experiment. We also investigate complexes of hydrogen with phosphorus and nitrogen. The binding energy of H with P is too low to lead to a significant codoping effect. A hydrogen-related vibrational mode of the N-H defect, and its isotopic shifts, are close to the commonly observed 3107-cm-1 line, and we tentatively assign this center to the defect. Hydrogen is strongly bound to dislocations which, together with H2*, may form part of the hydrogen accumulation layer detected in some plasma studies.

Jones, R.School of Physics, Stocker Road, University of Exeter, Exeter, Devon, EX4 4QL, United Kingdom (författare)
Heggie, M. I.CPES, University of Sussex, Falmer, Brighton, BN1 9QJ, United Kingdom (författare)
Ewels, C. P.CPES, University of Sussex, Falmer, Brighton, BN1 9QJ, United Kingdom (författare)
Briddon, P. R.Department of Physics, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, United Kingdom (författare)
Öberg, SvenLuleå tekniska universitet,Matematiska vetenskaper(Swepub:ltu)oberg (författare)
School of Physics, Stocker Road, University of Exeter, Exeter, Devon, EX4 4QL, United KingdomCPES, University of Sussex, Falmer, Brighton, BN1 9QJ, United Kingdom (creator_code:org_t)

Ingår i:Physical Review B. Condensed Matter and Materials Physics65:111098-01211550-235X

Av författaren/redakt...: Goss, J. P.; Jones, R.; Heggie, M. I.; Ewels, C. P.; Briddon, P. R.; Öberg, Sven

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