Temperature dependence of the Fermi level in low-temperature-grown GaAs
作者:
Y. H. Chen,
Z. Yang,
Z. G. Wang,
R. G. Li,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 15
页码: 1866-1868
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.121209
出版商: AIP
数据来源: AIP
摘要:
A variable-temperature reflectance difference spectroscopy study of GaAs grown by molecular beam epitaxy at low-temperature GaAs (LT-GaAs) shows that the Fermi level is mostly determined by the point defects in samples annealed at below 600 °C and can be shifted by photoquenching the defects. The Fermi level is otherwise almost temperature independent, leading to an estimated width of the defect band of 150 meV in the as-grown sample. For LT-GaAs annealed at 850 °C, the Fermi level is firmly pinned, most likely by the As precipitates. ©1998 American Institute of Physics.
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