title: Lead halide perovskites and other metal halide complexes as inorganic capping ligands for colloidal nanocrystals.
abstract: Lead halide perovskites (CH3NH3PbX3, where X = I, Br) and other metal halide complexes (MX(n), 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.
authors.affiliation: Institute of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich , CH-8093 Zürich, Switzerland.
authors.forename: Dmitry N
authors.initials: DN
authors.lastname: Dirin
authors.forename: Sébastien
authors.initials: S
authors.lastname: Dreyfuss
authors.forename: Maryna I
authors.initials: MI
authors.lastname: Bodnarchuk
authors.forename: Georgian
authors.initials: G
authors.lastname: Nedelcu
authors.forename: Paris
authors.initials: P
authors.lastname: Papagiorgis
authors.forename: Grigorios
authors.initials: G
authors.lastname: Itskos
authors.forename: Maksym V
authors.initials: MV
authors.lastname: Kovalenko
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