Efficient generation of emissive many-body correlations in copper-doped colloidal quantum wells
Author(s)
Date
2022-09-21Source Title
Cell Reports Physical Science
Print ISSN
26663864
Publisher
Cell Press
Volume
3
Issue
9
Pages
1 - 12
Language
English
Type
ArticleItem Usage Stats
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Abstract
Colloidal quantum wells (CQWs) provide an appealing platform to achieve emissive many-body correlations for novel optoelectronic devices, given that they act as hosts for strong carrier Coulomb interactions and present suppressed Auger recombination. However, the demonstrated high-order excitonic emission in CQWs requires ultrafast pumping with high excitation levels and can only be spectrally resolved at the single-particle level under cryogenic conditions. Here, through systematic investigation using static power-dependent emission spectroscopy and transient carrier dynamics, we show that Cu-doped CdSe CQWs exhibit continuous-wave-pumped high-order excitonic emission at room temperature with a large binding energy of ∼64 meV. We attribute this unique behavior to dopant excitons in which the ultralong lifetime and the highly localized wavefunction facilitate the formation of many-body correlations. The spectrally resolved high-order excitonic emission generated at power levels compatible with solar irradiation and electrical injection might pave the way for novel solution-processed solid-state devices. © 2022 The Authors
Keywords
Colloidal nanocrystalsColloidal quantum wells
Copper doping
High-order excitonic states
Ultrafast spectroscopy