Abstract
We report on molecular beam epitaxy (MBE) growth and luminescence properties of tensile-strained type-II GaAs/GaSb 1− x As x ( 0 < x < 0.05 ) nanostructures. Depending on the nominal thickness of a GaAs layer, we observed either growth of ultra-thin GaAs 1− y Sb y alloyed quantum wells (QWs) or self-organized formation of quantum dots (QDs). Both QW and QD nanostructures exhibit bright photoluminescence in the 1.5–2.2-μm range. AlGaSbAs laser diodes with GaAs/GaSb nanostructures in the active region have also been fabricated. The laser diode incorporating a 1.1-ML GaAs/13-ML GaSb superlattice in the active region shows room-temperature lasing at a wavelength of 1.85 μm under pulsed mode operation.
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