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Proceedings Paper

Excitons and multi-excitons in heterostructures semiconductor nanocrystals
Author(s): A. Sitt; G. Menagen; U. Banin
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Paper Abstract

Multiple excitations in quantum dots core/shell heterostructures are studied via quasi continuous wave multiexciton spectroscopy method. For ZnTe/CdSe core/shell quantum dots, a transfer from attractive to repulsive biexciton binding energy is detected as the shell thickness increases, indicating a transfer from quasi type-I to type-II regimes. For CdSe/CdS seeded nanorods, a transfer from binding to repulsive behavior is detected for the biexciton, accompanied by significant reduction in oscillator strength of the triexciton transition as core diameters decreases below 2.8nm, indicating a transition of the electronic excited states from type-I localization in the core to a quasi type-II delocalization along the entire rod as the core diameter decreases. However, as rods dimensions are decreased, a transfer from repulsive to binding biexciton energy occurs, demonstrating a change of the system from a quasi type-II to quasi-type-I behavior.

Paper Details

Date Published: 1 September 2009
PDF: 10 pages
Proc. SPIE 7393, Nanophotonic Materials VI, 739307 (1 September 2009); doi: 10.1117/12.831124
Show Author Affiliations
A. Sitt, The Hebrew Univ. of Jerusalem (Israel)
G. Menagen, The Hebrew Univ. of Jerusalem (Israel)
U. Banin, The Hebrew Univ. of Jerusalem (Israel)

Published in SPIE Proceedings Vol. 7393:
Nanophotonic Materials VI
Stefano Cabrini; Taleb Mokari, Editor(s)

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