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Copyright 2004 by Marcel Dekker, Inc. All Rights Reserved.

Copyright 2004 by Marcel Dekker, Inc. All Rights Reserved.

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Figure 6 Normalized PLE scans for seven different-sized CdSe nanocrystal samples.Size increases from top to bottom and ranges from f1.5 to f4.3 nm in radius.(Adapted from Ref. 9.)valence-band structure, shown in Fig. 3, could then be included <strong>by</strong> consideringeach subband (A, B, and C) as a simple parabolic band. In such a zerothorderpicture, each bulk subband would lead to a ladder of particle-in-aspherestates for the hole, as shown in Fig. 8. Quantum-dot transitions wouldoccur between these hole states and the electron levels arising from the bulkconduction band. However, this simplistic approach fails to describe theexperimental absorption structure. In particular, two avoided crossings arepresent in Fig. 7 [between features (e) and (g) at f2.0 eV and between features(e) and (c) above 2.2 eV] and these are not predicted <strong>by</strong> this particle-in-aspheremodel.<strong>Copyright</strong> <strong>2004</strong> <strong>by</strong> <strong>Marcel</strong> <strong>Dekker</strong>, <strong>Inc</strong>. <strong>All</strong> <strong>Rights</strong> <strong>Reserved</strong>.

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