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• W3090295404 endingPage "114476" @default.
• W3090295404 startingPage "114476" @default.
• W3090295404 abstract "We present a study of the electronic and optical properties of carriers in GaAs/AlxGa1-xAs quantum ring (QR) as a function of the aluminum concentration (x) in the barrier and the ring height (hM). We calculated the wavefunctions and the energies of the electrons and holes using the effective mass approximation. We found that the variation of x or hM, leads to a crossover, and consequently the mixing, of the electronic states of symmetry X and Γ. Then, a change from type I to type II of the GaAs/AlGaAs quantum ring occurs for x about 0.6 and hM about 1.3 nm. To present the point of type I-type II transition, we drew a color map that shows the shift of this point with x and hM. The radiative lifetime of the carriers is calculated in both type I and type II cases. In the latter case, we have taken into account the coupling between the confined electronic states of symmetry X and Γ. A value of 7 meV for the coupling potential is deduced from a comparison between our theoretical results and experimental ones. A color map showing the variation of the lifetime with x and hM was likewise drawn. Finally, these results can be exploited in several applications like solar cells." @default.
• W3090295404 created "2020-10-08" @default.
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• W3090295404 date "2021-02-01" @default.
• W3090295404 modified "2023-09-27" @default.
• W3090295404 title "Band alignment transition from type I to type II in GaAs / AlxGa1-x As quantum ring" @default.
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• W3090295404 doi "https://doi.org/10.1016/j.physe.2020.114476" @default.
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