Temperature Dependence of Excitonic and Biexcitonic Decay Rates in Colloidal Nanoplatelets by Time-Gated Photon Correlation
| Autor: | Gaoling Yang, Ron Tenne, Dan Oron, Venkata Jayasurya Yallapragada, Daniel Amgar, Elad Benjamin |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Letter Exciton 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Molecular physics Auger Colloid Condensed Matter::Materials Science Physics::Atomic and Molecular Clusters ddc:530 General Materials Science Physical and Theoretical Chemistry Quantum Biexciton Condensed Matter::Quantum Gases business.industry Condensed Matter::Other 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 0104 chemical sciences Photon correlation Semiconductor 0210 nano-technology business |
| Zdroj: | The Journal of Physical Chemistry Letters |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.0c01628 |
| Popis: | Excitons in colloidal semiconductor nanoplatelets (NPLs) are weakly confined in the lateral dimensions. This results in significantly smaller Auger rates and, consequently, larger biexciton quantum yields, when compared to spherical quantum dots (QDs). Here we report a study of the temperature dependence of the biexciton Auger rate in individual CdSe/CdS core-shell NPLs, through the measurement of time-gated second-order photon correlations in the photoluminescence. We also utilize this method to directly estimate the single-exciton radiative rate. We find that whereas the radiative lifetime of NPLs increases with temperature, the Auger lifetime is almost temperature-independent. Our findings suggest that Auger recombination in NPLs is qualitatively similar to that of semiconductor quantum wells. Time-gated photon correlation measurements offer the unique ability to study multiphoton emission events, while excluding effects of competing fast processes, and can provide significant insight into the photophysics of a variety of nanocrystal multiphoton emitters. published |
| Databáze: | OpenAIRE |
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