Excitons and multi-excitons in heterostructures semiconductor nanocrystals

A. Sitt*, G. Menagen, U. Banin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

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.

Original languageAmerican English
Title of host publicationNanophotonic Materials VI
DOIs
StatePublished - 2009
EventNanophotonic Materials VI - San Diego, CA, United States
Duration: 2 Aug 20093 Aug 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7393
ISSN (Print)0277-786X

Conference

ConferenceNanophotonic Materials VI
Country/TerritoryUnited States
CitySan Diego, CA
Period2/08/093/08/09

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