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Figure 5.2
Radial probability functions for hole and electron in (a) 2 nm diameter
CdSe particle; (b) 2 nm CdSe with 4 A ZnS shell; (c) 2 nm CdSe with 4 A
CdS shell. Right-hand side shows associated band osets. Reprinted
with permission from B. O. Dabbousi, J. Rodriguez-Viejo, F. V.
Mikulec, J. R. Heine, H. Mattoussi, R. Ober, K. F. Jensen and M. G.
Bawendi,
J. Phys. Chem. B
, 1997, 101, 9463. Copyright 1997 American
Chemical Society.
cantly
protected against surface oxidation, as determined by X-ray photoelectron
spectroscopy (XPS), whereas shells of only 0.65 monolayers still showed
evidence of surface oxide generation. Electron microscopy of the particles
showed continuous lattice fringes throughout the samples, with no inter-
faces between the core and the shell, indicating clean epitaxial growth.
Slightly patchy growth with preference along the (001) axis was also observed,
resulting in particles with a slight increase in the aspect ratio. Wide angle
X-ray scattering patterns revealed di
Particles with shells of 1.3 monolayers were also found to be signi
raction patterns increasingly consistent
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