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Quasi-epitaxial Metal-Halide Perovskite Ligand Shells on PbS Nanocrystals

Epitaxial growth techniques enable nearly defect free heterostructures with coherent interfaces, which are of utmost importance for high performance electronic devices. While high-vacuum technology-based growth techniques are state-of-the art, here we pursue a purely solution processed approach to obtain nanocrystals with eptaxially coherent and quasi-lattice matched inorganic ligand shells. Octahedral metal-halide clusters, respectively 0-dimensional perovskites, were employed as ligands to match the coordination geometry of the PbS cubic rock-salt lattice. Different clusters (CH3NH3+)(6–x)[M(x+)Hal6](6–x)– (Mx+ = Pb(II), Bi(III), Mn(II), In(III), Hal = Cl, I) were attached to the nanocrystal surfaces via a scalable phase transfer procedure. The ligand attachment and coherence of the formed PbS/ligand core/shell interface was confirmed by combining the results from transmission electron microscopy, small-angle X-ray scattering, nuclear magnetic resonance spectroscopy and powder X-ray diffraction. The lat...

Authors:   Mykhailo Sytnyk; Sergii Yakunin; Wolfgang Schöfberger; Rainer T. Lechner; Max Burian; Lukas Ludescher; Niall A. Killilea; AmirAbbas YousefiAmin; Dominik Kriegner; Julian Stangl; Heiko Groiss; Wolfgang Heiss
Journal:   ACS Nano
Year:   2017
DOI:   10.1021/acsnano.6b04721
Publication date:   01-Feb-2017
Facts, background information, dossiers
  • scattering
  • perovskites
  • perovskite
  • coherence
  • Art
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