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Di-carbon complexes in AlAs and GaAs
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
School of Physics, University of Exeter.
Fraunhofer-Institut für Angewandte Festkörperphysik, Tullastrasse 72, D-79108 Freiburg.
Interdisciplinary Research Centre for Semiconductor Materials, The Blackett Laboratory, Imperial College of Science, Technology and Medicine, London.
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1998 (English)Conference paper, Meeting abstract (Refereed)
Abstract [en]

Heat treatment of heavily carbon doped AlAs and GaAs results in a loss of CAS shallow acceptors. In Raman scattering experiments on annealed CBE grown GaAs with 12C and 13C isotopes, and MOVPE grown AlAs it is found that the loss of carriers is accompanied by the appearance of two high frequency lines. These lie near to the stretch mode of an isolated C2 molecule (1855 cm-1). This is consistent with the formation of two types of di-carbon defects in these materials where the C atoms are bonded together and one or both of which act as a donor. Using a local density functional method to investigate the structure and dynamics of several di-carbon defects, we find that the dimer at an As site is bistable and aligned approximately in a [100] direction in the neutral charge state, and in a [110] direction when positively ionised. The calculated frequencies lie within 10% of the measured values in both materials. Other defects are investigated too with a view of determining the structures giving rise to the modes

Place, publisher, year, edition, pages
1998. Vol. 210, 869-872 p.
Keyword [en]
density functional theory, doping, diffusion, Raman spectroscopy, semiconductors, III-V, arsenides, AlAs, GaAs, AlGaAs, Natural sciences - Physics, Materials science - Functional materials
Keyword [sv]
Naturvetenskap - Fysik, Teknisk materialvetenskap - Funktionella material
Research subject
Scientific Computing
Identifiers
URN: urn:nbn:se:ltu:diva-38065DOI: 10.1002/(SICI)1521-3951(199812)210:23.0.CO;2-MLocal ID: c552f450-1936-11de-ae94-000ea68e967bOAI: oai:DiVA.org:ltu-38065DiVA: diva2:1011564
Conference
International Conference on Shallow-Level Centres in Semiconductors : 27/07/1998 - 30/07/1998
Note
Godkänd; 1998; 20090325 (andbra)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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Latham, Chris D.Öberg, Sven
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