Infrared-Active Heterostructured Nanocrystals with Ultra long Carrier Lifetimes

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We present the synthesis of composite PbSe/CdSe/ CdS nanocrystals with two distinct geometries: core/shell/shell structures and tetrapods. These novel nanostructures exhibit extremely long carrier decay times up to 20 mu s that are combined with high emission efficiencies in the infrared. The increase in carrier lifetimes is attributed to the reduction of the electron-hole overlap as a result of delocalization of the electron wave function into the outer CdS shell or arms. The ultralong carrier lifetimes and controlled geometry render these nanocrystals attractive for a variety of applications from lasing to photocatalysis and photovoltaics.
Publisher
AMER CHEMICAL SOC
Issue Date
2010-07
Language
English
Article Type
Article
Keywords

SEMICONDUCTOR NANOCRYSTALS; CDSE; GROWTH

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.132, no.29, pp.9960 - 9962

ISSN
0002-7863
DOI
10.1021/ja102716p
URI
http://hdl.handle.net/10203/97558
Appears in Collection
CBE-Journal Papers(저널논문)
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