1. Photoluminescence study of InSb∕AlxIn1−xSb quantum wells
- Author
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M. B. Santos, Niti Goel, X. H. Zhang, R. E. Doezema, Z. S. Shi, N. Dai, F. H. Zhao, and S. J. Chung
- Subjects
Materials science ,Photoluminescence ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Condensed Matter::Other ,Exciton ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Signal ,Condensed Matter::Materials Science ,Ionization ,Thermal ,Luminescence ,Recombination ,Quantum well - Abstract
We present the results of photoluminescence experiments on InSb∕AlxIn1−xSb multi-quantum-wells on GaAs substrates. A comparison of the photoluminescence signals with transmission measurements shows Stokes shifts of 2.8–6.9meV, indicating that the low temperature luminescence is mainly due to bound excitons localized by interfacial potential minima. The high temperature signal is attributed to ionized free carriers. The well width dependent thermal activation energy investigation indicates that nonradiative carrier loss from the wells to the barriers is not a dominant mechanism. Instead, we suggest that the thermal recombination by surface dislocations or defects might be the main nonradiative channel for high temperature luminescence.
- Published
- 2006
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