Red states versus blue states in colloidal silicon nanocrystals: Exciton sequestration into low-density traps

Jack Fuzell, Arthur Thibert, Tonya M. Atkins, Mita Dasog, Erik Busby, Jonathan G C Veinot, Susan M. Kauzlarich, Delmar S. Larsen

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The ultrafast exciton photodynamics of red-emitting and blue-emitting colloidal Si nanocrystals are contrasted under low (1.5 mJ/cm2) and high (9.1 mJ/cm2) excitation powers with broadband transient absorption spectroscopy. While the low-power initiated transient signals differ strongly for the two samples, the high-power signals exhibit similar nonmonotonic kinetics, resulting in a new population formed on a 10 to 30-ps time scale with a sample independent spectrum and decay kinetics. This phenomenon is ascribed to the saturation of low-density red-emitting and blue-emitting traps via a state-filling mechanism to populate new meta-stable states at higher excitation powers. The states responsible for blue emission and high-power populations are ascribed to traps from low-density nitrogen and oxygen impurities, respectively, and share similar charge-transfer character with the silicon nanocrystal core.

Original languageEnglish (US)
Pages (from-to)3806-3812
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume4
Issue number21
DOIs
StatePublished - Nov 7 2013

Fingerprint

Silicon
Excitons
Nanocrystals
nanocrystals
excitons
traps
Kinetics
kinetics
silicon
Absorption spectroscopy
metastable state
excitation
Charge transfer
absorption spectroscopy
Nitrogen
charge transfer
Impurities
Oxygen
broadband
saturation

Keywords

  • exciton dynamics
  • silicon nanoparticles
  • state-filling
  • ultrafast dynamics

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Fuzell, J., Thibert, A., Atkins, T. M., Dasog, M., Busby, E., Veinot, J. G. C., ... Larsen, D. S. (2013). Red states versus blue states in colloidal silicon nanocrystals: Exciton sequestration into low-density traps. Journal of Physical Chemistry Letters, 4(21), 3806-3812. https://doi.org/10.1021/jz401896k

Red states versus blue states in colloidal silicon nanocrystals : Exciton sequestration into low-density traps. / Fuzell, Jack; Thibert, Arthur; Atkins, Tonya M.; Dasog, Mita; Busby, Erik; Veinot, Jonathan G C; Kauzlarich, Susan M.; Larsen, Delmar S.

In: Journal of Physical Chemistry Letters, Vol. 4, No. 21, 07.11.2013, p. 3806-3812.

Research output: Contribution to journalArticle

Fuzell, J, Thibert, A, Atkins, TM, Dasog, M, Busby, E, Veinot, JGC, Kauzlarich, SM & Larsen, DS 2013, 'Red states versus blue states in colloidal silicon nanocrystals: Exciton sequestration into low-density traps', Journal of Physical Chemistry Letters, vol. 4, no. 21, pp. 3806-3812. https://doi.org/10.1021/jz401896k
Fuzell, Jack ; Thibert, Arthur ; Atkins, Tonya M. ; Dasog, Mita ; Busby, Erik ; Veinot, Jonathan G C ; Kauzlarich, Susan M. ; Larsen, Delmar S. / Red states versus blue states in colloidal silicon nanocrystals : Exciton sequestration into low-density traps. In: Journal of Physical Chemistry Letters. 2013 ; Vol. 4, No. 21. pp. 3806-3812.
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