Article: Structural Properties and Energy Spectrum of Novel GaSb/AlP Self-Assembled Quantum Dots.
Nanomaterials (Basel, Switzerland)
2023 Volume 13, Issue 5
Abstract: In this work, the formation, structural properties, and energy spectrum of novel self-assembled GaSb/AlP quantum dots (SAQDs) were studied by experimental methods. The growth conditions for the SAQDs' formation by molecular beam epitaxy on both matched ... ...
| Abstract | In this work, the formation, structural properties, and energy spectrum of novel self-assembled GaSb/AlP quantum dots (SAQDs) were studied by experimental methods. The growth conditions for the SAQDs' formation by molecular beam epitaxy on both matched GaP and artificial GaP/Si substrates were determined. An almost complete plastic relaxation of the elastic strain in SAQDs was reached. The strain relaxation in the SAQDs on the GaP/Si substrates does not lead to a reduction in the SAQDs luminescence efficiency, while the introduction of dislocations into SAQDs on the GaP substrates induced a strong quenching of SAQDs luminescence. Probably, this difference is caused by the introduction of Lomer 90°-dislocations without uncompensated atomic bonds in GaP/Si-based SAQDs, while threading 60°-dislocations are introduced into GaP-based SAQDs. It was shown that GaP/Si-based SAQDs have an energy spectrum of type II with an indirect bandgap and the ground electronic state belonging to the X-valley of the AlP conduction band. The hole localization energy in these SAQDs was estimated equal to 1.65-1.70 eV. This fact allows us to predict the charge storage time in the SAQDs to be as long as >>10 years, and it makes GaSb/AlP SAQDs promising objects for creating universal memory cells. |
|---|---|
| Language | English |
| Publishing date | 2023-02-28 |
| Publishing country | Switzerland |
| Document type | Journal Article |
| ZDB-ID | 2662255-5 |
| ISSN | 2079-4991 |
| ISSN | 2079-4991 |
| DOI | 10.3390/nano13050910 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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