Applied Physics

A String of Dots

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Science  26 Mar 2004:
Vol. 303, Issue 5666, pp. 1947
DOI: 10.1126/science.303.5666.1947a

The growth of self-assembled quantum dots (QDs) via a strain-driven mechanism has been shown to result in the formation of high-quality defect-free structures. However, this mode of fabrication yields an essentially random positioning of QDs on the substrate surface, and lithographic patterning is used to specify seeding and nucleation sites for QD growth.

Wang et al. show that the growth of QDs as self-assembled chains of several micrometers in length can be achieved simply by interrupting the growth sequence. Although the mechanism for the long-range alignment remains unclear, the ability to control the size, composition, and position of the dots within the deposition process should, nevertheless, provide the possibility of engineering some interesting device structures. — ISO

Appl. Phys. Lett. 84, 1931 (2004).

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