Cathodoluminescence Spectroscopy Of Zinc-Blende Gan Quantum Dots

We analyzed the cathodoluminescence of zinc-blende GaN/AlN quantum dots grown by two different methods. Method A being droplet epitaxy, a vapor liquid solid process and method B being Stranski-Krastanov growth. At an equal quantum dot density of 1011 cm(-2), droplet epitaxy grown quantum dots have shown a luminescence intensity which was more than one order of magnitude higher than the one of Stranski-Krastanov quantum dots. Furthermore, we revealed a dependency between the quantum dot emission energy and the amount of deposited Ga. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim