title: Electronic impurity doping in CdSe nanocrystals.
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.
authors.affiliation: Optical Materials Engineering Laboratory, ETH Zurich, 8092 Zurich, Switzerland.
authors.forename: Ayaskanta
authors.initials: A
authors.lastname: Sahu
authors.forename: Moon Sung
authors.initials: MS
authors.lastname: Kang
authors.forename: Alexander
authors.initials: A
authors.lastname: Kompch
authors.forename: Christian
authors.initials: C
authors.lastname: Notthoff
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Wills
authors.forename: Donna
authors.initials: D
authors.lastname: Deng
authors.forename: Markus
authors.initials: M
authors.lastname: Winterer
authors.forename: C Daniel
authors.initials: CD
authors.lastname: Frisbie
authors.forename: David J
authors.initials: DJ
authors.lastname: Norris