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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Kinetically Controlled Synthesis of Quasi-Square CsPbI3 Nanoplatelets with Excellent Stability.

Mengyun Chen1, Tiankai Zhang1, Anna Elsukova1

  • 1Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden.

Small (Weinheim an Der Bergstrasse, Germany)
|November 27, 2023
PubMed
Summary

Stable cesium lead iodide nanoplatelets (NPLs) were synthesized by accelerating crystallization. This kinetic control enhances spectral and phase stability, improving endurance against NPL fusion for light-emitting diodes.

Keywords:
accelerated crystallizationphase stabilityprecursor engineeringspectral stabilitysquare perovskite nanoplatelets

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Perovskite nanoplatelets (NPLs) exhibit desirable luminescent properties but face challenges with spectral and phase stability, particularly iodide-based formulations.
  • The shape of NPLs influences their bandgap and luminescence, but stability issues hinder practical applications.

Purpose of the Study:

  • To develop stable cesium lead iodide (CsPbI3) NPLs through accelerated crystallization under ambient conditions.
  • To investigate the relationship between NPL morphology, surface energy, and stability.

Main Methods:

  • Ambient-condition synthesis with accelerated crystallization, involving fast nucleation and short growth periods.
  • Utilizing an additional iodide supplier, such as zinc iodide, to ensure complete transformation of PbI2 into PbI3- intermediates.
  • Tuning NPLs from rectangular to quasi-square shapes by controlling synthesis kinetics.

Main Results:

  • Achieved stable CsPbI3 NPLs via accelerated crystallization, enhancing kinetic control over morphology.
  • Tuning NPLs to quasi-square shapes reduced the surface-area-to-volume ratio, lowering surface energy and improving resistance to NPL fusion.
  • Demonstrated excellent color stability in light-emitting diodes under various bias stresses.

Conclusions:

  • Accelerated crystallization offers a viable route to synthesize stable perovskite NPLs.
  • Morphological control through kinetic synthesis is crucial for enhancing the stability and performance of CsPbI3 NPLs.
  • The developed CsPbI3 NPLs show promise for stable optoelectronic applications, particularly in light-emitting diodes.