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 journalArticle

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

Fingerprint Dive into the research topics of 'Electronic impurity doping in CdSe nanocrystals'. Together they form a unique fingerprint.

Cite this