Efficient multiple exciton generation observed in colloidal PbSe quantum dots with temporally and spectrally resolved intraband excitation

Ji Minbiao, Park Sungnam, Stephen T. Connor, Taleb Mokari, Cui Yi, Kelly J. Gaffney

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

We have spectrally resolved the intraband transient absorption of photogenerated excitons to quantify the exciton population dynamics in colloidal PbSe quantum dots (QDs). These measurements demonstrate that the spectral distribution, as well as the amplitude, of the transient spectrum depends on the number of excitons excited in a QD. To accurately quantify the average number of excitons per QD, the transient spectrum must be spectrally integrated. With spectral integration, we observe efficient multiple exciton generation In colloidal PbSe QDs.

Original languageEnglish
Pages (from-to)1217-1222
Number of pages6
JournalNano Letters
Volume9
Issue number3
DOIs
Publication statusPublished - 2009 Mar 11
Externally publishedYes

ASJC Scopus subject areas

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

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