Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 29, Pages 9960-9962Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja102716p
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Funding
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES)
- Chemical Sciences, Biosciences and Geosciences Division of BES, U.S. DOE
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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.
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