Electronic impurity doping in CdSe nanocrystals

Ayaskanta Sahu, Moon Sung Kang, Alexander Kompch, Christian Notthoff, Andrew W. Wills, Donna Deng, Markus Winterer, C. Daniel Frisbie, David J. Norris

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)2587-2594
Number of pages8
JournalNano Letters
Volume12
Issue number5
DOIs
StatePublished - May 9 2012

Keywords

  • Semiconductor nanocrystals
  • cation exchange
  • colloidal quantum dots
  • photoluminescence enhancement
  • silver doping
  • thin-film transistors

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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