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(a) AFM image of the ordered pyramid shaped QDs in the first layer of the QDC (bottommost layer of QDs). (b) Height profile along the line shown in (a). (c) AFM image of the ordered QDs in the fifteenth-layer of the QDC (topmost layer of QDs). (c) The hexagonal ordering is schematically illustrated by a hexagon. (d) Statistical height distribution of the ordered QDs shown in (c), the average value 〈H〉 and the standard dispersion δ of the height of QDs are also shown.
(a) Cross-sectional TEM image of a ten-layer GeSi QDC. The short black arrow indicates a nanopit on the substrates. (b) HRTEM image of a QD column. (c) Schematic side view illustration of the QDC structure.
(a) PL spectra of the capped fifteen-layer ordered and random QDs sample at 16 K, under excitation power of 0.3 W. The decomposed NP and TO PL peaks are indicated by dash-lines. (b) Integrated PL intensity of QDs as a function of excitation power. (c) PL spectrum of the fifteen-layer ordered QDs sample as a function of excitation power at 16 K.
(a) The peak energy, (b) the FWHM of the NP, and the TO peaks of QDs as a function of excitation power.
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