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Excited states and their dynamics in CdSe quantum dots studied by two-color 2D spectroscopy
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SYSNO ASEP 0557509 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Excited states and their dynamics in CdSe quantum dots studied by two-color 2D spectroscopy Author(s) Wang, Z. (SE)
Lenngren, Nils (FZU-D)
Amarotti, E. (SE)
Hedse, A. (SE)
Žídek, Karel (UFP-V) ORCID
Zheng, K. (SE)
Zigmantas, D. (SE)
Pullerits, T. (SE)Number of authors 8 Source Title Journal of Physical Chemistry Letters. - : American Chemical Society - ISSN 1948-7185
Roč. 13, č. 5 (2022), s. 1266-1271Number of pages 6 s. Language eng - English Country US - United States Keywords energy-transfer ; nanocrystals ; electron ; photogeneration ; recombination ; coherence Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects EF16_019/0000789 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 ; UFP-V - RVO:61389021 UT WOS 000754489600015 EID SCOPUS 85124085591 DOI 10.1021/acs.jpclett.1c04110 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address http://hdl.handle.net/11104/0331478
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