期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 12, 页码 4670-4679出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja413026h
关键词
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资金
- Solar Photochemistry program within division of Chemical Sciences, Geosciences, and Biosciences, Office of Science, Office of Basic Energy Sciences (BES)
- Department of Energy (DOE)
- DOE [DE-AC36-08GO28308]
- Center for Advanced Solar Photophysics (CASP), an Energy Frontier Research Center
- Office of Naval Research (ONR) through Naval Research Laboratory's Basic Research Program
We report the synthesis and characterization of Pb-chalcogenide fused quantum-dot (QD) dimer structures. The resulting QD dimers range in length from 6 to 16 nm and are produced by oriented attachment of single QD monomers with diameters of 3.1-7.8 nm. QD monomers with diameters exceeding about 5 nm appear to have the greatest affinity for QD dimer formation and, therefore, gave the greatest yields of fused structures. We find a new absorption feature in the first exciton QD dimer spectra and assign this to a splitting of the 8-fold degenerate 1S-level. The dimer splitting increases from 50 to 140 meV with decrease of the QD-monomer size, and we present a mechanism that accounts for this splitting. We also demonstrate the possibility of fusing two QDs with different sizes into a heterostructure.
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