Hot-Carrier Relaxation in CdSe/CdS Core/Shell Nanoplatelets
| dc.contributor.author | Pelton, Matthew | |
| dc.contributor.author | Wang, Yana | |
| dc.contributor.author | Fedin, Igor | |
| dc.contributor.author | Talapin, Dmitri V. | |
| dc.contributor.author | O’Leary, Stephen K. | |
| dc.date.accessioned | 2020-02-07T15:34:55Z | |
| dc.date.available | 2020-02-07T15:34:55Z | |
| dc.date.issued | 2019-12-11 | |
| dc.description.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. | en_US |
| dc.description.sponsorship | The authors thank Richard Schaller for assistance with the streak camera measurements. This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility under Contract No. DE-AC02-06CH11357. Work at The University of British Columbia was funded by the Natural Sciences and Engineering Research Council of Canada. Y.W. acknowledges support from the China Scholarship Council (CSC). I.F. and D.V.T. acknowledge support from the National Science Foundation under award DMR-1629601. | en_US |
| dc.description.uri | https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.9b08006 | en_US |
| dc.format.extent | 7 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2rytu-xzpk | |
| dc.identifier.citation | Pelton, Matthew; Wang, Yana; Fedin, Igor; Talapin, Dmitri V.; O’Leary, Stephen K.; Hot-Carrier Relaxation in CdSe/CdS Core/Shell Nanoplatelets; The Journal of Physical Chemistry 124, 1, 1020-1026 (2019); https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.9b08006 | en_US |
| dc.identifier.uri | http://hdl.handle.net/11603/17235 | |
| dc.identifier.uri | https://doi.org/10.1021/acs.jpcc.9b08006 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | ACS Publications | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department Collection | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Hot-Carrier Relaxation in CdSe/CdS Core/Shell Nanoplatelets | en_US |
| dc.type | Text | en_US |