Carrier relaxation dynamics in lead sulfide colloidal quantum dots

Emanuel Istrate*, Sjoerd Hoogland, Vlad Sukhovatkin, Larissa Levina, Stefan Myrskog, Peter W.E. Smith, Edward H. Sargent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

We report transient absorption saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place when more than one electron-hole pair is excited in a dot. We find an Auger coefficient of 4.5 × 10-30 cm6/s for dots of 5.5 nm diameter, and observe saturation of the absorption bleaching when the (8-fold degenerate) first level is filled. We develop a model for the absorption dynamics using Poisson statistics and find a good fit with our experimental measurements.

Original languageEnglish (US)
Pages (from-to)2757-2760
Number of pages4
JournalJournal of Physical Chemistry B
Volume112
Issue number10
DOIs
StatePublished - Mar 13 2008

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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