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Positron annihilation study of HVPE grown thick GaN layers

✍ Scribed by Misheva, M. ;Larsson, H. ;Gogova, D. ;Monemar, B.

Book ID
105363199
Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
75 KB
Volume
202
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

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 10^16^ to 10^17^ 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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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