Efficient Multiple Exciton Generation Observed in Colloidal PbSe Quantum Dots with Temporally and Spectrally Resolved Intraband Excitation

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

Research output: Contribution to journalArticlepeer-review

114 Scopus citations

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. © 2009 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1217-1222
Number of pages6
JournalNano Letters
Volume9
Issue number3
DOIs
StatePublished - Mar 11 2009
Externally publishedYes

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