Hot-Carrier Relaxation in CdSe/CdS Core/Shell NanoplateletsClick to copy article linkArticle link copied!
- Matthew Pelton*Matthew Pelton*E-mail: [email protected]Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, Maryland 21250, United StatesCenter for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United StatesMore by Matthew Pelton
- Yana WangYana WangSchool of Engineering, The University of British Columbia, Kelowna, British Columbia V1V 1V7, CanadaMore by Yana Wang
- Igor FedinIgor FedinDepartment of Chemistry and James Franck Institute, University of Chicago, Chicago, Illinois 60637, United StatesMore by Igor Fedin
- Dmitri V. TalapinDmitri V. TalapinCenter for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United StatesDepartment of Chemistry and James Franck Institute, University of Chicago, Chicago, Illinois 60637, United StatesMore by Dmitri V. Talapin
- Stephen K. O’LearyStephen K. O’LearySchool of Engineering, The University of British Columbia, Kelowna, British Columbia V1V 1V7, CanadaMore by Stephen K. O’Leary
Abstract
We present time-resolved photoluminescence (PL) spectroscopy of a series of colloidal CdSe/CdS core/shell nanoplatelets with different core and shell thicknesses. Exciton numbers are determined from the integrated PL intensities, and carrier temperatures are determined from the high-energy exponential tail of the PL spectra. For times between 10 and 1000 ps, the measured carrier relaxation dynamics are well described by a simple model of Auger reheating: biexcitonic Auger recombination continually increases the average energy of the carriers (while decreasing their number), and this reheating sets a bottleneck to cooling through electron–phonon coupling. For times between 1 and 10 ps, the relaxation dynamics are consistent with electron–phonon coupling, where the bottleneck is now the decay of the longitudinal optical phonon population. Comparison of relaxation dynamics to recombination dynamics reveals changes in the carrier–phonon coupling for shell thicknesses greater than 4 monolayers.
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