Abstract
The influence of multi-layer stacks of vertically coupled InAs/GaAs quantum dot (QD) active region is studied with room temperature photoluminescence (RT-PL), double crystal X-ray and transmission electron microscopy (TEM). High efficiency electronic vertically coupled (EVC) quantum dots (QDs) lasers emitting near 1.3μm are fabricated. The transparency current density as low as 7 A/cm^2 per layer and the internal quantum efficiency as high as 90% were obtained. High crystal quality is therefore demonstrated with as many as 10 layers of highly strain EVCQD active region.
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