Influence of V/III ratio on QD size distribution

Abstract

The influence of V/III ratio on the formation of quantum dots (QDs) grown by metal-organic chemical vapor deposition (MOCVD) is investigated by atomic force microscopy (AFM) and photoluminescence (PL) measurements. As V/III ratio increases, the density of QDs decreases accompanied by the transition of QD size distribution from bimodal (at V/III= 9) to single-modal (at V/III= 15), and then to bimodal (at V/III= 25) again, which is attributed to the change of the indium-species migration length at different V/III ratios. There are PL spectrum redshifts and the PL peak intensity decreases as V/III ratio increases.

Keywords

quantum dots (QDs) / V/III ratio / QD size distribution / photoluminescence (PL)

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Acknowledgements

This work was supported by the National High Technology Research and Development Program of China (No. 2007AA03Z414) and the National Natural Science Foundation of China (Grant No. 60777019).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg