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Control of quantum dot density and alignment using modified buffer layers
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10.1116/1.1949215
/content/avs/journal/jvstb/23/4/10.1116/1.1949215
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/23/4/10.1116/1.1949215
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

AFM images of GaAs buffers: (a) buffer HL, (b) buffer HH, (c) buffer , and (d) buffer . For all images, the gray-scale ranges displayed are . The line-cut profile is shown below each image.

Image of FIG. 2.
FIG. 2.

(Color online) AFM images of one-period QD SLs grown on: (a) buffer HL, (b) buffer HH, (c) buffer , and (d) buffer . For each image, FFTs are shown as insets. For all images, the grey-scale ranges displayed are . In the FFTs, the color-scale from light grey (green) to white ranges from 53% to 77% of the intensity of the central maximum.

Image of FIG. 3.
FIG. 3.

(a) AFM image of one-period QD SLs on buffer HL and (b) corresponding double-side shadowed image, which reveals step edges.

Image of FIG. 4.
FIG. 4.

(Color online) AFM images of five-period QD SLs grown on: (a) buffer HL, (b) buffer HH, (c) buffer , and (d) buffer . For each image, FFTs are shown as insets. For all images, the grey-scale ranges displayed are . In the FFTs, the color-scale from light grey (green) to white from ranges from 53% to 77% of the intensity of the central maximum.

Image of FIG. 5.
FIG. 5.

(Color online) AFM images of ten-period QD SLs grown on: (a) buffer HL, (b) buffer HH, (c) buffer , and (d) buffer . For each image, FFTs are shown as insets. The grey-scale displayed are: (a) , (b) , (c) , and (d) . In the FFTs, the color-scale from light grey (green) to white ranges from 53% to 77% of the intensity of the central maximum.

Image of FIG. 6.
FIG. 6.

Normalized areal densities of QD vs SL period numbers for each buffer type: buffer HL (squares); buffer HH (triangles); buffer (diamonds); and buffer (circles). is the density of QDs in a specific period .

Image of FIG. 7.
FIG. 7.

(Color online) Possible model for anisotropic alignment of QDs grown on buffers with mound features: (a) cross section of QD superlattices grown on buffers with mounds and (b) schematic strain profile of GaAs layers in (a). Grey (green) represents In or InAs. Black (blue) represents Ga or GaAs. Dashed black (blue) lines represent InGaAs layers.

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/content/avs/journal/jvstb/23/4/10.1116/1.1949215
2005-07-25
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Control of InAs∕GaAs quantum dot density and alignment using modified buffer layers
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/23/4/10.1116/1.1949215
10.1116/1.1949215
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