AFM image of QR and its morphology. (a) AFM image (10 × 10 μm2) of 15-ML QR grown on 14-ML In0.1 Ga0.9As layer. (b) the corresponding morphology of single QR, and (c) the cross-sectional profiles of QR in the  and [1-10] directions.
Tong et al. Nanoscale Research Letters 2012 7:520 doi:10.1186/1556-276X-7-520