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

119 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

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The work has been supported by the Global Climate and Energy Project (GCEP) at Stanford University, the King Abdullah University of Science and Technology (KAUST): Global Research Partnership (GRP) through the Center for Advanced Molecular Photovoltaics (CAMP), and the Department of Energy. S.T.C. acknowledges the support from a National Science Foundation Graduate Fellowship. Work at the Molecular Foundry was supported by the Director, Office of Science, Office of Basic Energy Science, Division of Materials Science and Engineering, U.S. Department of Energy, under contract DE-AC0205CHII231.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

Fingerprint

Dive into the research topics of 'Efficient Multiple Exciton Generation Observed in Colloidal PbSe Quantum Dots with Temporally and Spectrally Resolved Intraband Excitation'. Together they form a unique fingerprint.

Cite this