Journal
ACS NANO
Volume 6, Issue 1, Pages 176-182Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn2036957
Keywords
single-molecule spectroscopy; colloidal nanocrystals; carbon nanotubes
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Funding
- Academia Sinica
- NSC of Taiwan
- ERC DCENSY
- Israel Science Foundation
- Harry de Jur Chair in Applied Science
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We utilize single-molecule spectroscopy combined with time-correlated single-photon counting to probe the electron transfer (ET) rates from various types of semiconductor hetero-nanocrystals, having either type-I or type-II band alignment, to single-walled carbon nanotubes. A significantly larger ET rate was observed for type-II ZnSe/CdS dot-in-rod nanostructures as compared to type-I spherical CriSe/ZnS core/shell quantum dots and to CdSe/CdS dot-in-rod structures. Furthermore, such rapid ET dynamics can compete with both Auger and radiative recombination processes, with significance for effective photovoltaic operation.
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