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Mechanism for improvements of optical properties of 1.3- quantum dots by a combined cap layer
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10.1063/1.2113408
/content/aip/journal/jap/98/8/10.1063/1.2113408
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/8/10.1063/1.2113408
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Room-temperature PL spectra of QDs covered by and cap layers.

Image of FIG. 2.
FIG. 2.

Comparison of the temperature dependence of the PL efficiency of the samples with and cap layers.

Image of FIG. 3.
FIG. 3.

Comparison of the low-temperature PLE spectra for the structures with and cap layers.

Image of FIG. 4.
FIG. 4.

Dark-field TEM micrographs of two dot-in-a-well structures: (a) QDs grown on 2-nm and covered by 6-nm ; (b) QDs grown on 2-nm and covered by 1-nm followed by 5-nm ; and (c) magnified images of a single QD for the two structures.

Image of FIG. 5.
FIG. 5.

(a) High magnification HAADF image for a structure with QDs grown on an -strained buffer layer and covered by a 3-nm plus 3-nm cap layer; (b) typical high-resolution TEM image of an uncapped QD grown on an strained buffer layer.

Image of FIG. 6.
FIG. 6.

The height of QDs as a function of the thickness of the component of the composite CL. The height of uncapped dots deposited under the same conditions is also shown.

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/content/aip/journal/jap/98/8/10.1063/1.2113408
2005-10-24
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mechanism for improvements of optical properties of 1.3-μmInAs∕GaAs quantum dots by a combined InAlAs–InGaAs cap layer
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/8/10.1063/1.2113408
10.1063/1.2113408
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