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Characterization of mass-transport grown GaN by hydride vapour-phase epitaxy
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
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2004 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 273, no 1-2, 118-128 p.Article in journal (Refereed) Published
Abstract [en]

A comprehensive study of the morphological, optical and microstructural properties of mass-transport (MT) and conventionally grown GaN by hydride vapour-phase epitaxy is presented. Spatially resolved techniques have been utilized to reveal in a comparative way, the characteristics of the material grown either in predominant vertical or lateral growth modes. A strong donor-acceptor pair (DAP) emission is observed from the MT regions with a distinctive intensity contrast between the exciton and DAP emission bands from MT and nontransport regions. Secondary ion mass spectroscopy and imaging were employed to investigate the impurity incorporation into different regions. An increase of residual oxygen and aluminium impurity concentrations was found in the MT areas. In addition, positron annihilation spectroscopy showed a strong signal of Ga vacancy clusters in the MT grown material. The increase of the point defect concentrations of both Ga vacancy and oxygen impurity, most likely forming defect complexes, is related to the enhancement of the DAP emission. © 2004 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2004. Vol. 273, no 1-2, 118-128 p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-24596DOI: 10.1016/j.jcrysgro.2004.09.025Local ID: 6772OAI: oai:DiVA.org:liu-24596DiVA: diva2:244918
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2017-12-13

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Paskova, TanjaPaskov, PlamenDarakchieva, VanyaWahab, Qamar UlMonemar, Bo

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Paskova, TanjaPaskov, PlamenDarakchieva, VanyaWahab, Qamar UlMonemar, Bo
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The Institute of TechnologyDepartment of Physics, Chemistry and BiologyMaterials Science
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Journal of Crystal Growth
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