Phase transformation of PbSe/CdSe nanocrystals from core-shell to Janus structure studied by photoemission spectroscopy

J. Habinshuti, P. Capiod, T. H. Nguyen, Y. Justo, F. J. Avila, M. C. Asensio, F. Bournel, J. J. Gallet, I. Vobornik, J. Fujii, A. Addad, K. Lambert, J. P. Nys, Y. Lambert, Z. Hens, A. Osherov, Y. Golan, O. Robbe, S. Turrell, B. Grandidier

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Photoelectron spectroscopic measurements have been performed, with synchrotron radiation on PbSe/CdSe heteronanocrystals that initially consist of core-shell structures. The study of the chemical states of the main elements in the nanocrystals shows a reproducible and progressive change in the valence-band and core-level spectra under photon irradiation, whatever the core and shell sizes are. Such chemical modifications are explained in light of transmission electron microscopy observations and reveal a phase transformation of the nanocrystals: The core-shell nanocrystals undergo a morphological change toward a Janus structure with the formation of semidetached PbSe and CdSe clusters. Photoelectron spectroscopy gives new insight into the reorganization of the ligands anchored at the surface of the nanocrystals and the modification of the electronic structure of these heteronanocrystals.

Original languageEnglish
Article number184102
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number18
DOIs
StatePublished - 3 May 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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