Forskningsoutput per år
Forskningsoutput per år
Zhengjun Wang, Nils Lenngren, Edoardo Amarotti, Albin Hedse, Karel Žídek, Kaibo Zheng, Donatas Zigmantas, Tõnu Pullerits
Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review
Quantum dots (QDs) form a promising family of nanomaterials for various applications in optoelectronics. Understanding the details of the excited-state dynamics in QDs is vital for optimizing their function. We apply two-color 2D electronic spectroscopy to investigate CdSe QDs at 77 K within a broad spectral range. Analysis of the electronic dynamics during the population time allows us to identify the details of the excitation pathways. The initially excited high-energy electrons relax with the time constant of 100 fs. Simultaneously, the states at the band edge rise within 700 fs. Remarkably, the excited-state absorption is rising with a very similar time constant of 700 fs. This makes us reconsider the earlier interpretation of the excited-state absorption as the signature of a long-lived trap state. Instead, we propose that this signal originates from the excitation of the electrons that have arrived in the conduction-band edge.
Originalspråk | engelska |
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Sidor (från-till) | 1266-1271 |
Antal sidor | 6 |
Tidskrift | Journal of Physical Chemistry Letters |
Volym | 13 |
Nummer | 5 |
DOI | |
Status | Published - 2022 feb. 10 |
Forskningsoutput: Avhandling › Doktorsavhandling (sammanläggning)