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Mn(2+)-Doped CdSe/CdS Core/Multishell Colloidal Quantum Wells Enabling Tunable Carrier-Dopant Exchange Interactions.

Savas Delikanli1, Mehmet Zafer Akgul1, Joseph R Murphy2

  • 1Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University , Ankara 06800, Turkey.

ACS Nano
|November 17, 2015
PubMed
Summary

We demonstrate tunable carrier-dopant exchange interactions in colloidal quantum wells by precisely controlling manganese ion placement. This enables new possibilities for solution-processed spin-based semiconductor devices.

Keywords:
core/shelldiluted magnetic semiconductorsnanoplateletsphotoluminescencesp−d exchange interaction

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Carrier-dopant exchange interactions are crucial for spintronic applications.
  • Previous colloidal quantum nanostructures lacked precise control over magnetic ion placement.
  • Wave function engineering offers a route to tune these interactions.

Purpose of the Study:

  • To investigate carrier-dopant exchange interactions in colloidal Mn(2+)-doped CdSe/CdS core/multishell quantum wells.
  • To achieve atomic layer precision in positioning manganese ions within quantum well heterostructures.
  • To explore the tunability of these interactions via wave function engineering.

Main Methods:

  • Colloidal atomic layer deposition (c-ALD) for synthesizing Mn(2+)-doped CdSe/CdS core/multishell quantum wells.
  • Precise incorporation of manganese into CdMnS shells on CdSe nanoplatelets.
  • Systematic adjustment of layer composition, location, and number to control wave function overlap with Mn ions.

Main Results:

  • Demonstrated tunable carrier-magnetic ion exchange interactions through wave function engineering.
  • Achieved atomic layer precision in Mn ion location within the heterostructures.
  • Obtained high photoluminescence quantum yield (up to 20%) at room temperature with narrow bandwidth (~22 nm).
  • Exhibited magneto-optical properties comparable to epitaxially grown quantum wells.

Conclusions:

  • Carrier-dopant exchange interactions in colloidal quantum wells are effectively tunable.
  • Precise control over Mn ion placement enables tailored magneto-optical properties.
  • These colloidal quantum wells present a promising platform for solution-processed spin-based semiconductor devices.