Influence of the substrate grade on structural and optical properties of GaN/AlGaN superlattices

The aspect of superior interfaces is studied using short-period GaN/AlGaN superlattices grown by Molecular Beam Epitaxy (MBE) on various substrates as versatile test structures for investigations of interface and layer properties. High-resolution x-ray diffraction pattern compared with simulations o...

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Bibliographic Details
Published in:Journal of crystal growth 2015-09, Vol.425, p.145-148
Main Authors: Schubert, F., Zybell, S., Heitmann, J., Mikolajick, T., Schmult, S.
Format: Article
Language:English
Subjects:
A1. Defects
A1. Exciton life time
A1. Time-resolved photoluminescence
A3. Molecular Beam Epitaxy
A3. Superlattice
Aluminum gallium nitrides
B1. Nitrides
Gallium nitrides
Molecular beam epitaxy
Molecular structure
Optical properties
Photoluminescence
Superlattice structures
Superlattices
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Summary:The aspect of superior interfaces is studied using short-period GaN/AlGaN superlattices grown by Molecular Beam Epitaxy (MBE) on various substrates as versatile test structures for investigations of interface and layer properties. High-resolution x-ray diffraction pattern compared with simulations of ideal structures prove coherent 2-dimensional growth of structures with homogenous layer composition and atomically smooth and abrupt interfaces. The influence of structural perfection on optical properties is investigated in time-resolved photoluminescence measurements of selected superlattices. The recombination behavior of the excitons, their life time and the photoluminescence emission energy depend on the substrate quality and the superlattice structure. Furthermore it could be demonstrated that for optimal growth conditions the limiting factor for structural and optical properties of our MBE grown layers and heterostructures is the substrate. •GaN/AlGaN superlattices as versatile test structures to study layer and interface properties.•HRXRD prove 2D- and homogenously MBE-grown heterostructures with abrupt and smooth interfaces.•Time-resolved PL shows influence of structural perfection on optical properties.•Substrate limits structural and optical properties of MBE growth.•Threading dislocation density dependent HRXRD and time-resolved PL characteristics.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2015.02.037