Journal
ACS NANO
Volume 10, Issue 11, Pages 10267-10274Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b05846
Keywords
exciton; nanocrystals; energy transfer; Forster mechanism; Dexter mechanism; epitaxially connected nanocrystals
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Funding
- National Science Foundation through the University of Minnesota MRSEC [DMR-1420013]
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Recently, epitaxially connected at facets semiconductor nano crystals (NCs) have been introduced to fascilitate the electron transport between nanocrystals. To fully deploy their potential, a better understanding of the exciton transfer between connected NCs is needed. We go beyond the two well-known transfer mechanisms suggested by Forster and Dexter and propose a third mechanism of exciton tandem tunneling. The tandem tunneling occurs through the intermediate state in which the electron and hole are in different NCs. The corresponding rate for exciton hops is larger than the Dexter rate and for Si is even much larger that the Forster one.
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