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Updated: Jul 1, 2025
04:14
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
12.9K
All-Perovskite Multicomponent Nanocrystal Superlattices.
Taras V Sekh1,2, Ihor Cherniukh1,2, Etsuki Kobiyama3
1Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
ACS Nano
|March 6, 2024
Summary
Researchers created novel multicomponent nanocrystal superlattices using only lead halide perovskite nanocrystals of varying sizes. These structures exhibit controlled energy transfer and enhanced exciton transport for advanced quantum optoelectronics.
Area of Science:
- Materials Science
- Nanoscience
- Quantum Optics
Background:
- Nanocrystal superlattices (NC SLs) are promising metamaterials with emergent properties from constituent nanocrystals (NCs).
- Lead halide perovskite (LHP) NCs show collective light emission (superfluorescence) and are ideal for SLs.
- Previous LHP NC SLs were single-component or coassembled with dielectric spacers.
Purpose of the Study:
- To report the formation of multicomponent LHP NC-only superlattices using CsPbBr3 NCs of different sizes.
- To investigate the structural diversity, NC coupling, and energy transfer mechanisms in these novel SLs.
- To explore the potential of these materials for quantum optoelectronic devices.
Main Methods:
- Synthesis of multicomponent NC SLs using CsPbBr3 NCs of different sizes.
- Structural characterization of the obtained SLs (ABO6, ABO3, NaCl types).
- Spectroscopic measurements (Förster-like energy transfer) and spatiotemporal exciton dynamics.
Main Results:
- Formation of diverse LHP NC-only SLs with orientationally and positionally locked NCs.
- Observed efficient energy transfer from smaller (5.3 nm) to larger (17.6 nm) CsPbBr3 NCs in ABO6-type SLs.
- Demonstrated enhanced exciton diffusivity in binary SLs compared to single-component assemblies across a wide temperature range (5–298 K).
Conclusions:
- Multicomponent LHP NC-only SLs can be fabricated with controlled structural diversity.
- Efficient NC coupling and energy transfer are achievable within these all-perovskite systems.
- These findings pave the way for advanced quantum optoelectronic devices leveraging tunable excitonic transport.
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