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      Efficient generation of emissive many-body correlations in copper-doped colloidal quantum wells

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      Author(s)
      Yu, Junhong
      Sharma, Manoj
      Li, Mingjie
      Liu, Baiquan
      Hernández-Martínez, Pedro Ludwig
      Delikanli, Savaş
      Sharma, Ashma
      Altintas, Yemliha
      Hettiarachchi, Chathuranga
      Sum, Tze Chien
      Demir, Hilmi Volkan
      Dang, Cuong
      Date
      2022-09-21
      Source Title
      Cell Reports Physical Science
      Print ISSN
      26663864
      Publisher
      Cell Press
      Volume
      3
      Issue
      9
      Pages
      1 - 12
      Language
      English
      Type
      Article
      Item Usage Stats
      8
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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 nanocrystals
      Colloidal quantum wells
      Copper doping
      High-order excitonic states
      Ultrafast spectroscopy
      Permalink
      http://hdl.handle.net/11693/111850
      Published Version (Please cite this version)
      https://dx.doi.org/10.1016/j.xcrp.2022.101049
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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