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| - Core−Shell Quantum Dots of Lattice-Matched ZnCdSe2 Shells on InP Cores: Experimentand Theory
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| - Lattice-matched ZnCdSe2 concentric epilayer shells up to 50 Å in thickness have been grown on InP corequantum dots (QDs). The quality of the epitaxially grown shells was monitored by absorption and emissionspectra and transmission electron microscopy (TEM). Shell growth was shown to be controllable and wasconsistently accompanied by a large red shift of the absorption and emission spectra. This results from increasedelectron delocalization and, hence, lower confinement energy compared to core QDs with no shell. Core−shell nanocrystals also show higher quantum yields for emission since the interface of the QDs is betterpassivated and deep surface trap luminescence is converted into band-edge luminescence. Theoreticalcalculations of the electron probability density in these core−shell QDs were made using high-level self-consistent field and tight-binding methods; the theoretical results are consistent with the experimental results.
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