Lookup NU author(s): Dr Jon Goss,
Professor Patrick Briddon
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Ab initio methods are used to investigate hydrogen defects in diamond. For the isolated impurity, the bond-centered site is found lowest in energy and posses both donor and acceptor levels. The neutral defect possesses a single local mode with 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 H*2 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 in rasonable agreement with experiment. Hydrogen is strongly bound to dislocations which, together with H*2, may form part of the hydrogen accumulation layer detected in some plasma studies.
Author(s): Briddon PR; Goss JP; Jones R; Heggie MI; Ewels CP; Oberg S
Publication type: Article
Publication status: Published
Journal: Physica Status Solidi (A) Applied Research
ISSN (print): 0031-8965
ISSN (electronic): 1521-396X
Publisher: Wiley - VCH Verlag GmbH & Co
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