Journal
ACS NANO
Volume 9, Issue 4, Pages 4591-4599Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b01245
Keywords
nanoheterostructure; CdSe@CdS; nanorods; exciton localization; exciton diffusion; luminescent solar concentrator
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Solar Photochemistry Program [DE-FG02-12ER16347, DE-FG03-02ER15753]
- National Science Foundation [CHE-1213758, DMR-0645618, DMR-130792]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1307192] Funding Source: National Science Foundation
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A critical step involved in many applications of one-dimensional seeded CdSe@CdS nanorods, such as luminescent solar concentrators, optical gains, and photocatalysis, is the localization of excitons from the light-harvesting CdS nanorod antenna into the light-emitting CdSe quantum dot seed. We report that the rod-to-seed exciton localization efficiency decreases with the rod length but is independent of band alignment between the CdSe seed and CdS rod. This universal dependence can be well modeled by the competition between exciton one-dimensional diffusion to the CdSe seed and trapping on the CdS rod. This finding provides a rational approach for optimizing these materials for their various device applications.
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