Amine-Free CsPbBr3 Perovskite Nanoplatelets Produced with Monolayer-Precision Thickness Control

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Ye Wu
  • Yang Liu
  • Nadesh Fiuza-Maneiro
  • Sergio Gómez-Graña
  • Muhammad Imran
  • Lakshminarayana Polavarapu
  • Xiaoming Li
  • Haibo Zeng

Detail(s)

Original languageEnglish
Pages (from-to)2425-2433
Journal / PublicationACS Materials Letters
Volume6
Issue number6
Online published20 May 2024
Publication statusPublished - 3 Jun 2024

Abstract

Ultrathin lead halide perovskite nanoplatelets (NPLs) can enable tunable emission across the entire visible spectrum of light. The band-gap tunability of NPLs does not require halide composition engineering, so halide segregation can be avoided. However, their photoluminescence quantum yield (PLQY) and optoelectronic applications are often hampered due to reversible protonation and deprotonation of conventional amine ligands. Herein, we demonstrate the synthesis of benzenesulfonate-terminated CsPbBr3 NPLs without the use of any amine, and we clarify their nucleation and growth mechanism. The thickness of amine-free NPLs is controlled with monolayer-level precision, and thus, their emission wavelength is tuned between 437 and 504 nm. Amine-free NPLs are solely terminated by a benzenesulfonate group, leading to a Cs-rich surface. The amine-free NPLs exhibit PLQYs up to 80%, and slow charge carrier relaxation. This work offers a comprehensive study of surface chemistry and ligand dynamics of perovskite NPLs. © 2024 American Chemical Society.

Citation Format(s)

Amine-Free CsPbBr3 Perovskite Nanoplatelets Produced with Monolayer-Precision Thickness Control. / Wu, Ye; Liu, Yang; Fiuza-Maneiro, Nadesh et al.
In: ACS Materials Letters, Vol. 6, No. 6, 03.06.2024, p. 2425-2433.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review