Nano Archive

On the absence of detectable carrier multiplication in a transient absorption study of InAs/CdSe/ZnSe core/shell1/shell2 quantum dots

Ben-Lulu, Meirav and Mocatta, David and Bonn, Mischa and Banin, Uri and Ruhman, Sanford (2008) On the absence of detectable carrier multiplication in a transient absorption study of InAs/CdSe/ZnSe core/shell1/shell2 quantum dots. NANO LETTERS, 8 (4). pp. 1207-1211.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl080199u

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 sizes 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.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nanoelectronics
ID Code:1837
Deposited By:Farnush Anwar
Deposited On:23 Dec 2008 11:57
Last Modified:12 Jan 2009 10:05

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