Strain-Balanced InAs/AlSb Type-II Superlattice Structures Growth on GaSb Substrate by Molecular Beam Epitaxy

We demonstrate strain-balanced InAs/AlSb type-II superlattices (T2SL) grown on GaSb substrates employing two kinds of interfaces (IFs): AlAs-like IF and InSb-like IF. The structures are obtained by molecular beam epitaxy (MBE) for effective strain management, simplified growth scheme, improved mater...

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Bibliographic Details
Published in:Materials 2023-02, Vol.16 (5), p.1968
Main Authors: Marchewka, Michał, Jarosz, Dawid, Ruszała, Marta, Juś, Anna, Krzemiński, Piotr, Płoch, Dariusz, Maś, Kinga, Wojnarowska-Nowak, Renata
Format: Article
Language:English
Subjects:
Compressive properties
Epitaxial growth
Epitaxy
Gallium antimonides
Indium arsenides
Infrared detectors
Interfaces
Intermetallic compounds
Investigations
Lattice parameters
Molecular beam epitaxy
Morphology
Radiation
Raman spectroscopy
Shutters
Spectrum analysis
Substrates
Superlattices
Surface properties
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Summary:We demonstrate strain-balanced InAs/AlSb type-II superlattices (T2SL) grown on GaSb substrates employing two kinds of interfaces (IFs): AlAs-like IF and InSb-like IF. The structures are obtained by molecular beam epitaxy (MBE) for effective strain management, simplified growth scheme, improved material crystalline quality, and improved surface quality. The minimal strain T2SL versus GaSb substrate can be achieved by a special shutters sequence during MBE growth that leads to the formation of both interfaces. The obtained minimal mismatches of the lattice constants is smaller than that reported in the literature. The in-plane compressive strain of 60-period InAs/AlSb T2SL 7ML/6ML and 6ML/5ML was completely balanced by the applied IFs, which is confirmed by the HRXRD measurements. The results of the Raman spectroscopy (measured along the direction of growth) and surface analyses (AFM and Nomarski microscopy) of the investigated structures are also presented. Such InAs/AlSb T2SL can be used as material for a detector in the MIR range and, e.g., as a bottom n-contact layer as a relaxation region for a tuned interband cascade infrared photodetector.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16051968