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Optical and Structural Properties of Emerging Dilute III-V Bismides
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 Title & Authors
Optical and Structural Properties of Emerging Dilute III-V Bismides
Santos, B.H. Bononi Dos; Gobatoa, Y. Galvao; Heninib, M.;
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In this paper, we present a review of optical and structural studies of epilayers grown by Molecular Beam Epitaxy (MBE) on (311)B and (001) GaAs substrates with different As fluxes. The results indicate that under near-stoichiometric conditions the bismuth incorporation is higher for samples grown on (311)B GaAs substrates than for those grown on (001) GaAs. In addition, carrier localization effects in GaBiAs layers are clearly revealed for both samples by optical measurements. The (311)B samples showed evidence of higher density of defects. It has also been found that the nonradiative centers play a significant role in the recombination process in this material system. The influence of post-growth annealing on the microstructural, optical, and magneto-optical properties was also investigated. An important improvement of optical and spin properties after thermal annealing due to the reduction of defects in the GaBiAs layers was observed.
Bismides;Molecular Beam Epitaxy;Defects;Growth;GaAsBi alloys;
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