Low density InAs quantum dots grown on GaAs nanoholes

A growth technique combining droplet epitaxy and molecular beam epitaxy (MBE) is developed to obtain a low density of InAs quantum dots (QDs) on GaAs nanoholes. This growth technique is simple, flexible, and does not require additional substrate processing. It makes possible separate control of the QD density via droplet epitaxy and the QD quality via MBE growth. In this letter the authors report the use of this technique to produce InAs QDs with a low density of 2.7x10(8) cm(-2) as well as good photoluminescence properties. The resulting samples are suitable for single QD device fabrication and applications. (c) 2006 American Institute of Physics.