Effect of annealing on metastable shallow acceptors in Mg-doped GaN layers grown on GaN substrates

被引:14
|
作者
Pozina, G. [1 ]
Hemmingsson, C. [1 ]
Paskov, P. P. [1 ]
Bergman, J. P. [1 ]
Monemar, B. [1 ]
Kawashima, T. [2 ]
Amano, H. [2 ]
Akasaki, I. [2 ]
Usui, A. [3 ]
机构
[1] Linkoping Univ, Dept Phys Chem & Biol, IFM, S-58183 Linkoping, Sweden
[2] Meijo Univ, Dept Mat Sci & Engn, Nagoya, Aichi 4688502, Japan
[3] Furukawa Co Ltd, R&D Div, Tsukuba 3050856, Japan
关键词
D O I
10.1063/1.2909541
中图分类号
O59 [应用物理学];
学科分类号
摘要
Mg-doped GaN layers grown by metal-organic vapor phase epitaxy on GaN substrates produced by the halide vapor phase technique demonstrate metastability of the near-band-gap photoluminescence (PL). The acceptor bound exciton (ABE) line possibly related to the C acceptor vanishes in as-grown samples within a few minutes under UV laser illumination. Annealing activates the more stable Mg acceptors and passivates C acceptors. Consequently, only the ABE line related to Mg is dominant in PL spectra for the annealed samples. The temporal changes in PL are permanent at low temperatures; however, they can be recovered after heating to 100 K or higher. (C) 2008 American Institute of Physics.
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页数:3
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