Lead halide perovskites and other metal halide complexes as inorganic capping ligands for colloidal nanocrystals

  • Dirin D
  • Dreyfuss S
  • Bodnarchuk M
 et al. 
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Abstract

Lead halide perovskites (CH3NH3PbX3, where X = I, Br) and other metal halide complexes (MXn, where M = Pb, Cd, In, Zn, Fe, Bi, Sb) have been studied as inorganic capping ligands for colloidal nanocrystals. We present the methodology for the surface functionalization via ligand-exchange reactions and the effect on the optical properties of IV-VI, II-VI, and III-V semiconductor nanocrystals. In particular, we show that the Lewis acid-base properties of the solvents, in addition to the solvent dielectric constant, must be properly adjusted for successful ligand exchange and colloidal stability. High luminescence quantum efficiencies of 20-30% for near-infrared emitting CH3NH3PbI3-functionalized PbS nanocrystals and 50-65% for red-emitting CH3NH3CdBr3- and (NH4)2ZnCl4-capped CdSe/CdS nanocrystals point to highly efficient electronic passivation of the nanocrystal surface.

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Authors

  • Dmitry N. Dirin

  • Sébastien Dreyfuss

  • Maryna I. Bodnarchuk

  • Georgian Nedelcu

  • Paris Papagiorgis

  • Grigorios Itskos

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