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      Impurity incorporation and exchange interactions in Co2+-doped CdSe/CdS core/shell nanoplatelets

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      Author
      Fainblat, R.
      Delikanlı, Savaş
      Spee, L.
      Czerny, T.
      Işık, Furkan
      Sharma, V. K.
      Demir, Hilmi Volkan
      Bacher, G.
      Date
      2019
      Source Title
      Journal of Chemical Physics
      Print ISSN
      0021-9606
      Publisher
      American Institute of Physics
      Volume
      151
      Issue
      22
      Pages
      224708-1 - 224708-10
      Language
      English
      Type
      Article
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      Abstract
      The intentional incorporation of transition metal impurities into colloidal semiconductor nanocrystals allows an extension of the host material’s functionality. While dopant incorporation has been extensively investigated in zero-dimensional quantum dots, the substitutional replacement of atoms in two-dimensional (2D) nanostructures by magnetic dopants has been reported only recently. Here, we demonstrate the successful incorporation of Co2+ ions into the shell of CdSe/CdS core/shell nanoplatelets, using these ions (i) as microscopic probes for gaining distinct structural insights and (ii) to enhance the magneto-optical functionality of the host material. Analyzing interatomic Co2+ ligand field transitions, we conclude that Co2+ is incorporated into lattice sites of the CdS shell, and effects such as diffusion of dopants into the CdSe core or diffusion of the dopants out of the heterostructure causing self-purification play a minor role. Taking advantage of the absorption-based technique of magnetic circular dichroism, we directly prove the presence of sp-d exchange interactions between the dopants and the band charge carriers in CdSe/Co2+:CdS heteronanoplatelets. Thus, our study not only demonstrates magneto-optical functionality in 2D nanocrystals by Co2+ doping but also shows that a careful choice of the dopant type paves the way for a more detailed understanding of the impurity incorporation process into these novel 2D colloidal materials.
      Keywords
      Doping
      Nanocrystals
      Exchange interactions
      Ligand fields
      Atomic layer deposition
      Heterostructures
      Nanoplatelet
      Magnetic circular dichroism spectroscopy
      Permalink
      http://hdl.handle.net/11693/53329
      Published Version (Please cite this version)
      https://dx.doi.org/10.1063/1.5129391
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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