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Theoretical investigation of Er-O co-doping in hexagonal GaN

Published online by Cambridge University Press:  07 July 2011

Simone Sanna ,
Uwe Gerstmann  and
Wolf Gero Schmidt
Simone Sanna
Affiliation:
Lehrstuhl für Theoretische Physik, Universität Paderborn, Warburger Straße 100, 33098 Germany.
Uwe Gerstmann
Affiliation:
Lehrstuhl für Theoretische Physik, Universität Paderborn, Warburger Straße 100, 33098 Germany.
Wolf Gero Schmidt
Affiliation:
Lehrstuhl für Theoretische Physik, Universität Paderborn, Warburger Straße 100, 33098 Germany.
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Abstract

The co-doping of hexagonal GaN with Er and O is investigated by means of density functional calculations. Predominantly Er-O defect-pairs characterized by a binding energy around 0.5 eV are formed. Different geometric configurations with various orientations (i.e. axial and basal pairs with C3v or C1h symmetry) are expected with similar formation energies. Independent of the particular configuration, the presence of oxygen does not deeply affect the atomic structure and the electronic charge distribution around the Er centers. The relatively high binding energy suggests that Er-O pairs should survive thermal treatment. An investigation of the binding energy per bond indicates that on the other hand Er-Ox complexes (x=2,3,4) are not likely to be formed (differently from Er-O co-doped Si). Rather, as long as the oxygen fluence does not overtake the Er fluence, different oxygen ions will be bound to different Er-centers.

Keywords

Erluminescencedopant

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1342: Symposium V – Rare-Earth Doping of Advanced Materials for Photonic Applications , 2011 , mrss11-1342-v05-03
Copyright
Copyright © Materials Research Society 2011

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