Concentric Multiple Rings by Droplet Epitaxy: Fabrication and Study of the Morphological Anisotropy
LNESS and Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125, Milan, Italy
Nanoscale Research Letters 2010, 5:1865-1867 doi:10.1007/s11671-010-9699-6Published: 1 August 2010
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  and [1–10] crystallographic directions, which can be ascribed to different activation energies for the Ga atoms migration processes.