journal article·2024-06-03

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

Ye Wu, Yang Liu, Nadesh Fiuza-Maneiro, Sergio Gómez-Graña, Muhammad Imran, Lakshminarayana Polavarapu, Andrey L. Rogach, Xiaoming Li, Haibo Zeng

ACS Materials Letters· Volume 6· Issue 6
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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 CsPbBr 3 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.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, 999077 Hong Kong SAR, China

Department of Physical Chemistry, CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Campus Universitario Lagoas Marcosende 36310 Vigo, Spain

Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada

Funding

Agencia Estatal de Investigaci?n · Ministerio de Ciencia e Innovaci?n · National Outstanding Youth Science Fund Project of National Natural Science Foundation of China · Xunta de Galicia · Innovation and Technology Commission · Fundamental Research Funds for the Central Universities · Outstanding Youth Foundation of Jiangsu Province

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