Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes

L. P. Balet, S. A. Ivanov, A. Piryatinski, M. Achermann, V. I. Klimov

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Abstract

We study inverted core/shell nanocrystals (NCs) in which a core of a wide gap semiconductor (ZnSe) is overcoated with a shell of a semiconductor of a narrower gap (CdSe). By monitoring radiative recombination lifetimes for a series of these NCs with a fixed core radius and progressively increasing shell thickness, we observe a continuous transition from Type-I (both electron and hole wave functions are distributed over the entire NC) to Type-II (electron and hole are spatially separated between the shell and the core) and back to Type-I (both electron and hole primarily reside in the shell) localization regimes. These observations are in good agreement with the calculated dependence of the electron-hole overlap integral on shell thickness.

Original languageEnglish
Pages (from-to)1485-1488
Number of pages4
JournalNano letters
Volume4
Issue number8
DOIs
Publication statusPublished - Aug 1 2004

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ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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