Atomic arrangements and formation mechanisms of the CuPt-type ordered structure in CdxZn1-xTe epilayers grown on GaAs substrates

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Selected area electron diffraction pattern (SADP) and transmission electron microscopy (TEM) measurements were carried out to investigate the ordered structure in CdxZn1-xTe epitaxial layers grown on (001) GaAs substrates. The SADP showed to sets of superstructure reflections with symmetrical intensities, and the corresponding high-resolution TEM image showed a doublet periodicity in the contrast of the {111} lattice planes. The results of the SADP and the TEM measurements showed the existence of a CuPt-type ordered structured in the CdxZn1-xTe epitaxial layers. This CuPt-type ordered structure had two different variants with an antiphase boundary existing between the two variants. The formation of a CuPt-type ordered structure in a CdxZn1-xTe epitaxial layer might originate from the minimization of the strain relaxation energy in the reconstructed GaAs (001) surface. A possible atomic arrangement of and a formation mechanism for the CuPt-type ordered structure in the CdxZn1-xTe epitaxial layer are presented based on the TEM results. These results provide important information on the microstructural properties for improving the efficiencies of optoelectronic devices operating in blue-green spectral regions. (C) 2001 American Institute of Physics.
Publisher
AMER INST PHYSICS
Issue Date
2001-02
Language
English
Article Type
Article
Keywords

LONG-RANGE ORDER; MOLECULAR-BEAM EPITAXY; VAPOR-PHASE EPITAXY; CDTE-FILMS; ALLOYS; DISORDER; (111)B; LAYERS; GAINP

Citation

APPLIED PHYSICS LETTERS, v.78, no.7, pp.922 - 924

ISSN
0003-6951
DOI
10.1063/1.1345841
URI
http://hdl.handle.net/10203/85730
Appears in Collection
MS-Journal Papers(저널논문)
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