Biexciton auger recombination in colloidal graphene quantum dots

We measure biexciton Auger recombination (AR) in colloidal graphene quantum dots (GQDs) by transient absorption spectroscopy. AR is reflected in GQDs with 132 and 168 sp2-hybridized C atoms as a decay with a ∼0.3  ps time constant and an amplitude depending superlinearly on pump fluence. Despite the...

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Bibliographic Details
Published in:Physical review letters 2014-09, Vol.113 (10), p.107401-107401, Article 107401
Main Authors: Sun, Cheng, Figge, Florian, McGuire, John A, Li, Qiqi, Li, Liang-shi
Format: Article
Language:English
Subjects:
Augers
Carbon
Carriers
Colloids
Graphene
Pumps
Quantum dots
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Summary:We measure biexciton Auger recombination (AR) in colloidal graphene quantum dots (GQDs) by transient absorption spectroscopy. AR is reflected in GQDs with 132 and 168 sp2-hybridized C atoms as a decay with a ∼0.3  ps time constant and an amplitude depending superlinearly on pump fluence. Despite the orders-of-magnitude difference in size between GQDs and carbon nanotubes, their biexciton AR rates are similar. This similarity is a result of strong carrier interactions in sp2-hybridized carbon nanostructures and suggests that GQDs may hold promise in the context of carrier multiplication.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.113.107401