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

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

Type

Article

Authors

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

Gaffney, Kelly J.

Date

2009-03-11

Permanent link to this record

http://hdl.handle.net/10754/598110

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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.

Citation

Ji M, Park S, Connor ST, Mokari T, Cui Y, et al. (2009) Efficient Multiple Exciton Generation Observed in Colloidal PbSe Quantum Dots with Temporally and Spectrally Resolved Intraband Excitation. Nano Lett 9: 1217–1222. Available: http://dx.doi.org/10.1021/nl900103f.

Sponsors

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.