Molecular‐beam epitaxial growth of CdTe(112) on Si(112) substrates
作者:
T. J. de Lyon,
D. Rajavel,
S. M. Johnson,
C. A. Cockrum,
期刊:
Applied Physics Letters
(AIP Available online 1995)
卷期:
Volume 66,
issue 16
页码: 2119-2121
ISSN:0003-6951
年代: 1995
DOI:10.1063/1.113922
出版商: AIP
数据来源: AIP
摘要:
High crystalline quality epitaxial CdTe(112)B/ZnTe films were deposited by molecular‐beam epitaxy directly onto vicinal Si(112) substrates, without use of GaAs interfacial layers. The films were characterized with x‐ray diffraction, optical microscopy, and wet chemical defect etching. Single crystal, twin‐free CdTe(112)B films exhibit structural quality exceeding that previously reported for CdTe(112)B heteroepitaxy on GaAs/Si(112) or GaAs(112)B substrates. X‐ray rocking curve full width at half‐maximum of 72 arcsec for CdTe(224) reflection and near‐surface etch pit densities (EPD) of 2×106cm−2have been observed for 8‐&mgr;m‐thick CdTe films. EPD depth profiles indicate that the threading dislocation density decreases with increasing II–VI epilayer thickness up to approximately 5 &mgr;m thickness and saturates at 2×106cm−2for thickness exceeding 5 &mgr;m. The CdTe epilayer orientation was observed to tilt 2° away from the Si(112) substrate orientation toward the [001] direction. ©1995 American Institute of Physics.
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