Size-dependent intrinsic radiative decay rates of silicon nanocrystals at large confinement energies

Milan Sykora, Lorenzo Mangolini, Richard D Schaller, Uwe Kortshagen, David Jurbergs, Victor I Klimov

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Abstract

We study ultrafast photoluminescence (PL) dynamics of Si nanocrystals (NCs). The early-time PL spectra (10ns) are almost independent of NC size and are likely due to surface-related recombination. Based on instantaneous PL intensities measured 2 ps after excitation, we determine intrinsic radiative rate constants for NCs of different sizes. These constants sharply increase for confinement energies greater than ∼1eV indicating a fast, exponential growth of the oscillator strength of zero-phonon, pseudodirect transitions.

Original languageEnglish
Article number067401
JournalPhysical Review Letters
Volume100
Issue number6
DOIs
Publication statusPublished - Feb 14 2008

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decay rates
nanocrystals
photoluminescence
silicon
oscillator strengths
energy
excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Size-dependent intrinsic radiative decay rates of silicon nanocrystals at large confinement energies. / Sykora, Milan; Mangolini, Lorenzo; Schaller, Richard D; Kortshagen, Uwe; Jurbergs, David; Klimov, Victor I.

In: Physical Review Letters, Vol. 100, No. 6, 067401, 14.02.2008.

Research output: Contribution to journalArticle

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AU - Klimov, Victor I

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