Abstract
Type II superlattices (SLs) short period InAs(4ML)/GaSb(8ML) were grown by molecular-beam epitaxy on lattice-mismatched GaAs substrates and on GaSb substrates. A smooth GaSb epilayer was formed on GaAs substrates by inserting mulit-buffer layers including an interfacial misfit mode AlSb quantum dot layer and AlSb/GaSb superlattices smooth layer. SLs grown on GaAs substrates (GaAs-based SLs) showed well-resolved satellite peaks in XRD. GaSb-based SLs with better structural quality and smoother surface showed strong photoluminescence at 2.55 μm with a full width at half maximum (FWHM) of 20 meV, narrower than 31 meV of GaAs-based SLs. Inferior optical absorption of GaAs-based SL was observed in the range of 2–3 μm. Photoresponse of GaSb-based SLs showed the cut-off wavelength at 2.6 μm.
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Supported by the the National Natural Science Foundation of China (Grant Nos. 60607016,60625405) and the National Basic Research Program of China (Grant No. 2007CB936304)
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Guo, J., Chen, H., Sun, W. et al. Comparison of short period InAs/GaSb superlattices on GaSb and GaAs substrates. Sci. China Ser. E-Technol. Sci. 52, 23–27 (2009). https://doi.org/10.1007/s11431-008-0352-x
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DOI: https://doi.org/10.1007/s11431-008-0352-x