Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 124, Issue 1, Pages 1020-1026Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b08006
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Funding
- Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility [DE-AC02-06CH11357]
- Natural Sciences and Engineering Research Council of Canada
- China Scholarship Council (CSC)
- National Science Foundation [DMR-1629601]
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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 PI, 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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