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- W2023234054 abstract "We have used MBE to grow in AlN/GaN superlattices, with different number of periods, on [email protected] MOVPE-GaN templates to study the development of defects such as surface deformation due to strain. After growth the samples were studied by atomic force microscopy (AFM), transmission electron microscopy (TEM), XRD and Fourier transform infrared spectroscopy (FT-IR). The strain increased with the number of quantum wells (QWs) and eventually caused defects such as microcracks visible by optical microscopy at four or more QW periods. High-resolution TEM images showed shallow recessions on the surface (surface deformation) indicating formation of microcracks in the MQW region. The measured intersubband (IS) absorption linewidth from a four period structure was 97meV, which is comparable with the spectrum from a 10 period structure at an absorption energy of ~700meV. This indicates that the interface quality of the MQW is not substantially affected by the presence of cracks." @default.
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- W2023234054 date "2009-02-01" @default.
- W2023234054 modified "2023-10-01" @default.
- W2023234054 title "Macroscopic defects in GaN/AlN multiple quantum well structures grown by MBE on GaN templates" @default.
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- W2023234054 doi "https://doi.org/10.1016/j.mejo.2008.07.065" @default.
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