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Transmission microscopy image of the CdSe/ZnS QDs. (a) Large area to determine the size distribution of QDs (b) Histogram of QDs diameters. (c) Larger magnification to show the nanocrystals.
Two dimensional map of the He+ scattering intensities as a function of the scattering angle and energy. (a) Experimental and (b) simulated MEIS spectra of CdSe/ZnS QDs on a silicon surface.
Models of QDs used for MEIS spectra analysis with the software PowerMeis. (a) Homogeneous quantum dot representation, (b) core-shell CdSe/ZnS model, covered by a OP layer (that represents TOPO), and (c) core-shell CdSe/CdZnS model.
Simulated MEIS energy spectra for a homogeneous CdSeZnS QD (dashed-line) and a core-shell CdSe/ZnS QD (solid-line) in comparison with present experimental data at two different scattering angles.
Simulated MEIS energy spectra for stoichiometric CdSe core and Cd enriched ZnS shell (solid-line) in comparison with present experimental data at two different scattering angles.
Elemental fractions determined by RBS and PIXE.
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