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Composition uniformity of site-controlled InAs/GaAs quantum dots

✍ Scribed by G. Biasiol; V. Baranwal; S. Heun; M. Prasciolu; M. Tormen; A. Locatelli; T.O. Mentes; M.A. Niño; L. Sorba

Book ID
104022132
Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
462 KB
Volume
323
Category
Article
ISSN
0022-0248

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✦ Synopsis

We have studied the composition profiles of Stranski-Krastanov InAs/GaAs quantum dots grown on patterned nanohole arrays. Two dimensional surface chemical maps obtained by X-ray photoemission electron microscopy reveal a non-uniform composition profile similar to that of standard dots grown on planar surfaces, with an enhanced In concentration at the center of the islands, with respect to the wetting layer. A statistical analysis, however, revealed an improvement of about 50% of dot composition uniformity associated with the already reported enhancement of size uniformity. No significant size or composition variation was found by changing the period of the hole pattern from 250 to 600 nm.

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