Controlling the Quantum Dot Nucleation Site

Motta, Nunzio, Sgarlata, Anna, Rosei, Federico, Szkutnik, Pierre-David, Nufris, S., Scarselli, M., & Balzarotti, Adalberto (2003) Controlling the Quantum Dot Nucleation Site. Materials Science and Engineering B: Advanced Functional Solid-state Materials, 101(1-3), pp. 77-88.

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Quantum dots (QDs) are actually easily produced by self-assembling during heteroepitaxial growth of semiconductors. In order to exploit the unique electronic properties of semiconductor QDs in novel quantum effect devices, the lateral dimensions of these structures have to be reduced to the order of tens of nanometers, which is the range of the De Broglie wavelength of electrons inside these materials. Moreover, millions of QDs must be arranged in dense ordered arrays to achieve the necessary active volume for optoelectronic applications. Nowadays it is possible to control size and shape of the nanocrystals, but it is still difficult to decide their nucleation site. Many approaches have been undertaken to overcome this problem, like using regular dislocation networks, lithographically and Atomic Force Microscopy (AFM) patterned substrates, naturally patterned surfaces. We present results obtained by some of these methods, visualized by Scanning Tunnelling Microscopy (STM) or AFM microscopy. STM measurements at high temperature during the epitaxial growth are of great help in these studies. Images and movies of the growth of Ge on Si help to identify the real nucleation sites of the islands and to follow their evolution. The influence of the ‘step bunching’ on the self-organization of Ge islands on Si(111) surfaces will be analysed, as an example of growth on self-nanostructured surfaces.

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16 citations in Web of Science®

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ID Code: 10724
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author.
DOI: 10.1016/S0921-5107(02)00657-8
ISSN: 0921-5107
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2002 Elsevier
Deposited On: 14 Nov 2007 00:00
Last Modified: 29 Feb 2012 13:30

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