Journal
NANO LETTERS
Volume 12, Issue 5, Pages 2587-2594Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl300880g
Keywords
Semiconductor nanocrystals; colloidal quantum dots; silver doping; photoluminescence enhancement; cation exchange; thin-film transistors
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Funding
- Materials World Network of the US National Science Foundation (NSF)
- German Research Foundation (DFG) [DMR-0908629, WI 981/11]
- MRSEC of the NSF [DMR-0819885]
- Industrial Partnership for Research in Interfacial and Materials Research at the University of Minnesota (UMN)
- UMN
- NSF under the NNIN
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0908629] Funding Source: National Science Foundation
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We dope CdSe nanocrystals with Ag impurities and investigate their optical and electrical properties. Doping leads not only to dramatic changes but surprising complexity. The addition of just a few Ag atoms per nanocrystal causes a large enhancement in the fluorescence, reaching efficiencies comparable to core-shell nanocrystals. While Ag was expected to be a substitutional acceptor, nonmonotonic trends in the fluorescence and Fermi level suggest that Ag changes from an interstitial (n-type) to a substitutional (p-type) impurity with increased doping.
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