Luminescence of as-grown and thermally annealed GaAsN/GaAs
作者:
S. Francoeur,
G. Sivaraman,
Y. Qiu,
S. Nikishin,
H. Temkin,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 15
页码: 1857-1859
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.121206
出版商: AIP
数据来源: AIP
摘要:
We report a study of the luminescence properties of coherently strainedGaAs1−xNxgrown on GaAs by metalorganic molecular beam epitaxy. Well-defined photoluminescence was observed in samples with a nitrogen concentration up to 3&percent;. Samples subjected to thermal anneals, investigated by x-ray diffraction and photoluminescence, show increased nitrogen incorporation and significant improvements in the luminescence efficiency. A band-gap reduction of more than 400 meV, compared to GaAs, is observed for a nitrogen concentration of∼3&percent;.For the range of nitrogen concentrations investigated here, the band gap follows predictions of the dielectric model of Van Vechten [J. A. Van Vechten and T. K. Bergstresser, Phys. Rev. B1, 3351 (1970), and references therein]. ©1998 American Institute of Physics.
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