Electron paramagnetic resonance spectroscopic investigation of manganese doping in ZnL (L = O, S, Se, Te) nanocrystals

Sayan Bhattacharyya, David Zitoun, Aharon Gedanken

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Intentional doping of transition metal ion impurities into semiconductor nanocrystals can alter the properties of these nanoscale materials, and the fact that doped nanocrystals can address key problems in applications from solar cells to bioimaging has stimulated research in this direction. The major dopant in the II-VI semiconductors is manganese. For practical applications, it is important for the dopants to remain confined within the nanocrystal, to enhance its interactions with charge and spin carriers. However, Mn-doping inside the host semiconductor lattice is a challenge, since the impurities tend to be expelled from the lattice to the nanocrystal surface or form Mn2+-Mn2+ clusters. Electron paramagnetic resonance (EPR) spectroscopy acts as an effective tool to probe the location of manganese in the diluted magnetic semiconductors (DMSs). This review deals with the various facets of manganese localization inside ZnO, ZnS, ZnSe, and ZnTe nanocrystals, as probed by EPR measurements.

Original languageEnglish
Pages (from-to)541-549
Number of pages9
JournalNanoscience and Nanotechnology Letters
Volume3
Issue number4
DOIs
StatePublished - Aug 2011

Keywords

  • DMS
  • Diluted magnetic semiconductor
  • EPR
  • Manganese doping
  • Nanocrystal

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