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Centrosymmetric quantum dots coherently embedded by epitaxial precipitation
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View: Figures


Image of FIG. 1.
FIG. 1.

TEM images of heterostructures before and after annealing. (a) Dark field images of the quantum well where the PbTe film corresponds to the bright areas of the image. (b) High resolution bright field image of the same quantum well, where the (002) and (220) lattice planes are resolved in the PbTe and the {111} planes in the CdTe matrix. [(c) and (d)]: Bright field images of the same sample after annealing at showing the formed PbTe QDs with the shape of small-rhombo-cubo-octahedrons, as sketchted in (c).

Image of FIG. 2.
FIG. 2.

Size distribution of the dots determined form cross sectional TEM images. The solid line represents an aspect ration of 1. The two gray areas indicate highly symmetric dots with aspect ratios between 0.8 and 1.2 and elongated dots with heights smaller than . The experimental points for the dots shown in the insets are indicated by larger symbols (circles).

Image of FIG. 3.
FIG. 3.

cw room temperature photoluminescence spectra of a heterostructures measured after annealing at various temperatures (solid lines) and of a bulk-like PbTe reference sample (dashed lines). In (a), the luminescence is excited energetically below the CdTe barriers with a pump laser at a power of and in (b) above the barriers with a Ti:sapphire laser with . The inset shows the nominal sample structure and the arrows indicate luminescence maxima from the quantum well (QW) and from the QDs.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Centrosymmetric PbTe∕CdTe quantum dots coherently embedded by epitaxial precipitation