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Persistent enhancement of exciton diffusivity in CsPbBr3 nanocrystal solids.
Shcherbakov-Wu, Wenbi; Saris, Seryio; Sheehan, Thomas John; Wong, Narumi Nagaya; Powers, Eric R; Krieg, Franziska; Kovalenko, Maksym V; Willard, Adam P; Tisdale, William A.
Afiliación
  • Shcherbakov-Wu W; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Saris S; Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Sheehan TJ; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Wong NN; Laboratory of Nanochemistry for Energy (LNCE), Institute of Chemical Sciences and Engineering (ISIC), École Polytechnique Fédérale de Lausanne, CH-1950 Sion, Switzerland.
  • Powers ER; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Krieg F; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Kovalenko MV; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Willard AP; Department of Chemistry and Applied Bioscience, ETH Zürich, Zürich, Switzerland.
  • Tisdale WA; Laboratory for Thin Films and Photovoltaics and Laboratory for Transport at Nanoscale Interfaces, Empa - Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland.
Sci Adv ; 10(8): eadj2630, 2024 Feb 23.
Article en En | MEDLINE | ID: mdl-38381813
ABSTRACT
In semiconductors, exciton or charge carrier diffusivity is typically described as an inherent material property. Here, we show that the transport of excitons among CsPbBr3 perovskite nanocrystals (NCs) depends markedly on how recently those NCs were occupied by a previous exciton. Using transient photoluminescence microscopy, we observe a striking dependence of the apparent exciton diffusivity on excitation laser power that does not arise from nonlinear exciton-exciton interactions or thermal heating. We interpret our observations with a model in which excitons cause NCs to transition to a long-lived metastable configuration that markedly increases exciton transport. The exciton diffusivity observed here (>0.15 square centimeters per second) is considerably higher than that observed in other NC systems, revealing unusually strong excitonic coupling between NCs. The finding of a persistent enhancement in excitonic coupling may help explain other photophysical behaviors observed in CsPbBr3 NCs, such as superfluorescence, and inform the design of optoelectronic devices.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos