On the absence of detectable carrier multiplication in a transient absorption study of InAs/CdSe/ZnSe core/shelm/shell2 quantum dots

Meirav Ben-Lulu, David Mocatta, Mischa Bonn, Uri Banin, Sanford Ruhman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

159 Scopus citations

Abstract

Tunable femtosecond pump-near IR probe measurements on InAs/CdSe/ZnSe core/shell1/shell2 nanocrystal quantum dots were conducted to quantify spontaneous carrier multiplication previously reported in this system. Experimental conditions were chosen to eliminate the need for determining absolute wavelength dependent cross sections of the nanocrystals and allow direct comparison of band edge absorption bleach kinetics for different excitation energies up to 3.7 times the band gap. Results for two sample sees show no signs of carrier multiplication within that range. This result Is discussed in light of reports describing occurrence of this novel phenomenon In quantum dots based on this as well as numerous other semiconductor materials.

Original languageAmerican English
Pages (from-to)1207-1211
Number of pages5
JournalNano Letters
Volume8
Issue number4
DOIs
StatePublished - Apr 2008

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