Two-dimensional electronic spectroscopy of CdSe nanoparticles at very low pulse power

Two-dimensional electronic spectroscopy of CdSe nanoparticles at very low pulse power Graham B. Griffin, Sandrine Ithurria, Dmitriy S. Dolzhnikov, Alexander Linkin, Dmitri V. Talapin et al. Citation: J. Chem. Phys. 138, 014705 (2013); doi: 10.1063/1.4772465 View online: http://dx.doi.org/10.1063/1.4772465 View Table of Contents: http://jcp.aip.org/resource/1/JCPSA6/v138/i1 Published by the AIP Publishing LLC.

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THE JOURNAL OF CHEMICAL PHYSICS 138, 014705 (2013)

Two-dimensional electronic spectroscopy of CdSe nanoparticles at very low pulse power Graham B. Griffin,1 Sandrine Ithurria,1 Dmitriy S. Dolzhnikov,1 Alexander Linkin,1 Dmitri V. Talapin,1,2 and Gregory S. Engel1,a) 1

The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA 2 Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois 60439, USA

(Received 24 September 2012; accepted 3 December 2012; published online 4 January 2013) Nanoparticles have been proposed as a promising material for creating devices that harvest, transport, and manipulate energy and electrons. Ultrafast charge carrier dynamics represent a critical design aspect and are dependent on both size and shape of the nanoparticle. Spectroscopic investigation of the electronic structure and dynamics of these systems is complicated by sample inhomogeneity, which broadens peaks and leads to ambiguity in interpretation of both spectra and dynamics. Here, we use two-dimensional electronic spectroscopy to remove inhomogeneous broadening and to clarify interpretation of measured dynamics. We specifically investigate the effect of nanoparticle shape on the electronic structure and ultrafast electronic dynamics in the band-edge exciton states of CdSe quantum dots, nanorods, and nanoplatelets. Particle size was chosen to enable straightforward comparisons of the effects of particle shape on the spectra and dynamics without retuning the laser source. The spectra were measured with low pulse powers (generally