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Digital Doping in Magic-Sized CdSe Clusters.

Franziska Münzer1, Jiwoong Yang2,3, Severin Lorenz1

  • 1Werkstoffe der Elektrotechnik and CENIDE, University Duisburg-Essen , Bismarckstraße 81, 47057 Duisburg, Germany.

ACS Nano
|July 16, 2016
PubMed
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Magic-sized semiconductor clusters with manganese dopants show a giant magneto-optical response. Only singly doped clusters are active, paving the way for future solotronic devices.

Area of Science:

  • Materials Science
  • Quantum Chemistry
  • Solid-State Physics

Background:

  • Magic-sized semiconductor clusters bridge quantum dots and molecules.
  • Doping these clusters with individual atoms can tune material properties.
  • Manganese (Mn2+) doping is explored for unique magneto-optical effects.

Purpose of the Study:

  • Investigate the impact of discrete manganese (Mn2+) dopant numbers on the magneto-optical response of (CdSe)13 clusters.
  • Determine the role of individual dopants versus multiple dopants in cluster functionality.
  • Explore potential applications in solotronics.

Main Methods:

  • Utilized time-of-flight mass spectrometry to differentiate undoped, monodoped, and bidoped (CdSe)13 cluster species.
  • Quantified the relative abundance of each cluster species at varying average doping concentrations.
Keywords:
diluted magnetic semiconductor nanostructuresmagic-sized clustermagneto-opticssingle-atom dopingsolotronics

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  • Measured the magneto-optical response of the separated cluster species.

    • Main Results:

    • A significant magneto-optical response was observed in Mn2+-doped (CdSe)13 clusters, persisting up to room temperature.
    • Exclusively monodoped clusters exhibited magneto-optical activity.
    • Bidoped clusters showed antiferromagnetic coupling between Mn2+ ions, rendering them magneto-optically passive.

    Conclusions:

    • Solitary Mn2+ dopants in (CdSe)13 clusters are responsible for the observed magneto-optical functionality.
    • The coupling behavior of dopants is highly dependent on their discrete number within the cluster.
    • These findings highlight the potential of precisely controlled doped clusters for solotronic applications.