JETP Letters

, Volume 90, Issue 12, pp 758–762

Direct bandgap optical transitions in Si nanocrystals

  • A. A. Prokofiev
  • A. S. Moskalenko
  • I. N. Yassievich
  • W. D. A. M. de Boer
  • D. Timmerman
  • H. Zhang
  • W. J. Buma
  • T. Gregorkiewicz
Condensed Matter

Abstract

The effect of quantum confinement on the direct bandgap of spherical Si nanocrystals has been modelled theoretically. We conclude that the energy of the direct bandgap at the Γ-point decreases with size reduction: quantum confinement enhances radiative recombination across the direct bandgap and introduces its “red“ shift for smaller grains. We postulate to identify the frequently reported efficient blue emission (F-band) from Si nanocrystals with this zero-phonon recombination. In a dedicated experiment, we confirm the “red“ shift of the F-band, supporting the proposed identification.

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • A. A. Prokofiev
    • 1
  • A. S. Moskalenko
    • 1
    • 2
  • I. N. Yassievich
    • 1
  • W. D. A. M. de Boer
    • 3
  • D. Timmerman
    • 3
  • H. Zhang
    • 4
  • W. J. Buma
    • 4
  • T. Gregorkiewicz
    • 3
  1. 1.Ioffe Physico-Technical InstituteSt. PetersburgRussia
  2. 2.Institut für PhysikMartin-Luther-UniversitätHalle-WittenbergGermany
  3. 3.Van der Waals-Zeeman InstituteUniversity of AmsterdamAmsterdamThe Netherlands
  4. 4.Van’t Hoff Institute for Molecular SciencesUniversity of AmsterdamAmsterdamThe Netherlands

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