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TEM plane view of the sample taken under 001 zone-axis bright-field condition. The QDs are diamond shaped, and present a density of . The dark contrast corresponds to the highly strained base of the QDs.
(a) Close view of a single QD. It presents a slight elongation along the [1–10] direction, and the edges are oriented along the [3–10] and [1–30] directions. (b) TEM cross view of a QD. The average height of the QDs is , and the thickness of the wetting layer is . The dark contrast around the QD corresponds to the strain field surrounding the nanostructure.
Standard PL spectrum of the sample recorded at with an excitation power density of .
spectrum of a single QD recorded at under various excitation powers between and . The and lines correspond to the radiative recombination of the exciton and the biexciton, respectively.
Power dependence of the integrated intensity of the (full circle) and (open circle) lines. Log scale in abscissa and ordinate: (full lines) fit of the experimental data with a linear (respectively, square) function of the pump power for the (respectively, ) line.
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