Evaluation of Surface Cleaning of Si(211) for Molecular-Beam Epitaxy Deposition of Infrared Detectors

被引:0
作者
M. Jaime-Vasquez
R. N. Jacobs
J. D. Benson
A. J. Stoltz
L. A. Almeida
L. O. Bubulac
Y. Chen
G. Brill
机构
[1] U.S. Army RDECOM,
[2] CERDEC Night Vision and Electronic Sensors Directorate,undefined
[3] U.S. Army Research Laboratory,undefined
来源
Journal of Electronic Materials | 2010年 / 39卷
关键词
CdTe; HgCdTe; Si(211); tail distribution; molecular-beam epitaxy (MBE); x-ray photoelectron spectroscopy (XPS); scanning Auger microscopy (SAM); ion scattering spectroscopy (ISS);
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摘要
We report an assessment of the reproducibility of the HF cleaning process and As passivation prior to the nucleation of ZnTe on the Si(211) surface using temperature desorption spectroscopy, ion scattering spectroscopy, and electron spectroscopy. Observations suggest full H coverage of the Si(211) surface with mostly monohydride and small amounts of dihydride states, and that F is uniformly distributed across the top layer as a physisorbed species. Variations in major contaminants are observed across the Si surface and at the CdTe-ZnTe/Si interface. Defects act as getters for impurities present on the Si surface, and some are buried under the CdTe/ZnTe heterostructure. Overall, the data show evidence of localized concentration of major impurities around defects, supporting the hypothesis of a physical model explaining the electrical activation of defects in long-wave infrared (LWIR) HgCdTe/CdTe/Si devices.
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页码:951 / 957
页数:6
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