Exciton storage in CdSe/CdS tetrapod semiconductor nanocrystals: Electric field effects on exciton and multiexciton states

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Liu, Sue ; Borys, Nicholas J. ; Huang, Jing ; Talapin, Dmitri V. ; Lupton, John M.

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Date of publication of this fulltext: 15 Nov 2012 08:20

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Item type:	Article
Journal or Publication Title:	Physical Review B (PRB)
Publisher:	American Physical Society
Volume:	86
Number of Issue or Book Chapter:	4
Page Range:	045303
Date:	9 July 2012
Institutions:	Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton
Projects:	Volkswagen Stiftung: Optoelectronic FRET gates: electrically controlled accumulation of excitation energy for switches and sensors
Identification Number:	Value Type 10.1103/PhysRevB.86.045303 DOI
Classification:	Notation Type 73.22.-f PACS 73.50.Gr PACS 73.63.Bd PACS 78.47.D- PACS
Keywords:	QUANTUM DOTS; PHOTOLUMINESCENCE INTENSITY; DYNAMICS; RECOMBINATION; EMISSION; FLUORESCENCE; CHARGE; AUGER; WELL; SPIN
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Partially
Item ID:	26694

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Abstract

CdSe/CdS nanocrystal tetrapods are interesting building blocks for excitonic circuits, where the flow of excitation energy is gated by an external stimulus. The physical morphology of the nanoparticle, along with the electronic structure, which favors electron delocalization between the two semiconductors, suggests that all orientations of a particle relative to an external electric field will ...

Abstract

CdSe/CdS nanocrystal tetrapods are interesting building blocks for excitonic circuits, where the flow of excitation energy is gated by an external stimulus. The physical morphology of the nanoparticle, along with the electronic structure, which favors electron delocalization between the two semiconductors, suggests that all orientations of a particle relative to an external electric field will allow for excitons to be dissociated, stored, and released at a later time. While this approach, in principle, works, and fluorescence quenching of over 95% can be achieved electrically, we find that discrete trap states within the CdS are required to dissociate and store the exciton. These states are rapidly filled up with increasing excitation density, leading to a dramatic reduction in quenching efficiency. Charge separation is not instantaneous on the CdS excitonic antennae in which light absorption occurs, but arises from the relaxed exciton following hole localization in the core. Consequently, whereas strong electromodulation of the core exciton is observed, the core multiexciton and the CdS arm exciton are not affected by an external electric field.

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Metadata last modified: 02 Jun 2018 19:57

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