Electronic impurity doping in CdSe nanocrystals |
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Authors: | Sahu Ayaskanta Kang Moon Sung Kompch Alexander Notthoff Christian Wills Andrew W Deng Donna Winterer Markus Frisbie C Daniel Norris David J |
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Affiliation: | Optical Materials Engineering Laboratory, ETH Zurich, 8092 Zurich, Switzerland. |
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Abstract: | 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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