Electronic Coupling of Highly Ordered Perovskite Nanocrystals in Supercrystals.
Journal
ACS applied energy materials
ISSN: 2574-0962
Titre abrégé: ACS Appl Energy Mater
Pays: United States
ID NLM: 101718976
Informations de publication
Date de publication:
23 May 2022
23 May 2022
Historique:
received:
18
10
2021
accepted:
15
02
2022
entrez:
1
6
2022
pubmed:
2
6
2022
medline:
2
6
2022
Statut:
ppublish
Résumé
Assembled perovskite nanocrystals (NCs), known as supercrystals (SCs), can have many exotic optical and electronic properties different from the individual NCs due to energy transfer and electronic coupling in the dense superstructures. We investigate the optical properties and ultrafast carrier dynamics of highly ordered SCs and the dispersed NCs by absorption, photoluminescence (PL), and femtosecond transient absorption (TA) spectroscopy to determine the influence of the assembly on the excitonic properties. Next to a red shift of absorption and PL peak with respect to the individual NCs, we identify signatures of the collective band-like states in the SCs. A smaller Stokes shift, decreased biexciton binding energy, and increased carrier cooling rates support the formation of delocalized states as a result of the coupling between the individual NC states. These results open perspectives for assembled perovskite NCs for application in optoelectronic devices, with design opportunities exceeding the level of NCs and bulk materials.
Identifiants
pubmed: 35647492
doi: 10.1021/acsaem.1c03276
pmc: PMC9131308
doi:
Types de publication
Journal Article
Review
Langues
eng
Pagination
5415-5422Informations de copyright
© 2022 The Authors. Published by American Chemical Society.
Déclaration de conflit d'intérêts
The authors declare no competing financial interest.
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