Positron annihilation study of HVPE grown thick GaN layers
2005 (English)In: Physica status solidi. A, Applied research, ISSN 0031-8965, E-ISSN 1521-396X, Vol. 202, no 5, 713-717 p.Article in journal (Refereed) Published
Single-crystalline GaN layers with a thickness up to 330 µm were grown by hydride vapor phase epitaxy on basal plane sapphire at gallium stable conditions in a bottom-fed vertical reactor at atmospheric pressure. Positron annihilation spectroscopy experiments were implemented in order to identify native point defects in the as-grown non-intentionally doped n-type GaN. Comparatively low concentrations of Ga vacancy related defects in the order of 1016 to 1017 cm–3 were extracted from the positron annihilation spectroscopy data. The Ga vacancy defect concentration was related to the intensity of the yellow photoluminescence band centered at 2.2 eV. The influence of the growth rate on the Ga vacancy related defect concentration was investigated. A trend of decreasing of the defect concentration with increasing of layer thickness is observed, which correlates with improving crystalline quality with the thickness.
Place, publisher, year, edition, pages
2005. Vol. 202, no 5, 713-717 p.
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-46094DOI: 10.1002/pssa.200461420OAI: oai:DiVA.org:liu-46094DiVA: diva2:266990