Open Access SPECIAL ISSUE ARTICLE

Concentric Multiple Rings by Droplet Epitaxy: Fabrication and Study of the Morphological Anisotropy

C Somaschini, S Bietti, A Fedorov, N Koguchi and S Sanguinetti*

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LNESS and Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125, Milan, Italy

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Citation and License

Nanoscale Research Letters 2010, 5:1865-1867 doi:10.1007/s11671-010-9699-6

Published: 1 August 2010

Abstract

We present the Molecular Beam Epitaxy fabrication of complex GaAs/AlGaAs nanostructures by Droplet Epitaxy, characterized by the presence of concentric multiple rings. We propose an innovative experimental procedure that allows the fabrication of individual portions of the structure, controlling their diameter by only changing the substrate temperature. The obtained nanocrystals show a significant anisotropy between [110] and [1–10] crystallographic directions, which can be ascribed to different activation energies for the Ga atoms migration processes.

Keywords:
GaAs/AlGaAs; Molecular beam epitaxy; Droplet epitaxy; Quantum rings