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Schematic diagram showing the two BAC models, which are used to calculate the energies of the conduction band, valence band, and spin-orbit split band of .
Calculated band structures for (a) GaAsSb, (b) , and (c) .
(a) Absorption spectrum of an as-grown GaAsSbN sample. The fitting curve, considering both the to and to transitions, is also depicted in the figure. The energy gap and spin-orbit splitting energy of the GaAsSbN sample are determined from curve fitting. (b) Energy gaps of the as-grown and annealed GaAsSbN samples with 2% and 3% N mole fraction as functions of Sb mole fraction. Solid curves are the simulation results with different N mole fractions, 0%, 2%, and 3%. (c) Ga–N vibration mode absorption spectra of a typical GaAsSbN sample before and after thermal annealing.
Spin-orbit splitting energies of GaAsSbN samples as a function of Sb mole fraction. For comparison, the splitting energies of GaAsSb alloys reported by K. Alberi et al. (Ref. 14 ) are also plotted.
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