Journal
ACS NANO
Volume 10, Issue 3, Pages 3295-3301Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b06772
Keywords
CdSe/CdS; nanorod; optical downshifting
Categories
Funding
- National Science Foundation Graduate Fellowship
- Eni SpA under the Eni-MIT Alliance Solar Frontiers Center
- DOE Office of Science, Basic Energy Sciences [DE-FG02-07ER46454]
- National Science Foundation [DMR-08-19762]
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A two-step process has been developed for growing the shell of CdSe/CdS core/shell nanorods. The method combines an established fast-injection-based step to create the initial elongated shell with a second slow injection growth that allows for a systematic variation of the shell thickness while maintaining a high degree of monodispersity at the batch level and enhancing the uniformity at the single-nanorod level. The second growth step resulted in nanorods exhibiting a fluorescence quantum yield up to 100% as well as effectively complete energy transfer from the shell to the core. This improvement suggests that the second step is associated with a strong suppression of the nonradiative channels operating both before and after the thermalization of the exciton. This hypothesis is supported by the suppression of a defect band, ubiquitous to CdSe-based nanocrystals after the second growth.
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