Web Release Date: November 3,
Sizing up the Exciton in Complex-Shaped Semiconductor Nanocrystals
Department of Chemistry, 80 St. George Street, Institute for Optical Sciences, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario, M5S 3H6 Canada
Received August 26, 2007
Revised October 16, 2007
Abstract:
We report a spectroscopic study of how nanocrystal shape influences exciton size. The effective exciton size in complex-shaped nanocrystals is examined by comparing exciton fine structure relaxation rates, measured by the ultrafast polarization transient grating method, to an extensive empirical calibration curve that relates the relaxation rates of quantum dots and nanorods to their diameters. It is found that the overall nanocrystal shape is important for determining the effective exciton size in nanocrystals. How nanocrystal shape plays a role in quantum confinement and therefore exciton shape is qualitatively discussed based on these experimental results.
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