Nano Archive

Growth of Low-Density Vertical Quantum Dot Molecules with Control in Energy Emission

Alonso-González, P. and González, L. and Martín-Sánchez, J. and González, Y. and Fuster, D. and Sales, D. L. and Hernández-Maldonado, D. and Herrera, M. and Molina, S. I. (2010) Growth of Low-Density Vertical Quantum Dot Molecules with Control in Energy Emission. Nanoscale Research Letters, 5 (12). pp. 1913-1916.


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In this work, we present results on the formation of vertical molecule structures formed by two vertically aligned InAs quantum dots (QD) in which a deliberate control of energy emission is achieved. The emission energy of the first layer of QD forming the molecule can be tuned by the deposition of controlled amounts of InAs at a nanohole template formed by GaAs droplet epitaxy. The QD of the second layer are formed directly on top of the buried ones by a strain-driven process. In this way, either symmetric or asymmetric vertically coupled structures can be obtained. As a characteristic when using a droplet epitaxy patterning process, the density of quantum dot molecules finally obtained is low enough (2 × 108 cm−2) to permit their integration as active elements in advanced photonic devices where spectroscopic studies at the single nanostructure level are required.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:10405
Deposited By:JNCASR
Deposited On:18 Oct 2011 08:19
Last Modified:18 Oct 2011 08:19

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