Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr3 Perovskite Nanocrystals
Julia S van der Burgt1, Jaco J Geuchies1, Berend van der Meer1
1Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Soft Condensed Matter, Debye Institute for Nanomaterials Science, and Physical and Colloidal Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Utrecht 3508 TA, Netherlands.
The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|September 25, 2018
Summary
Researchers observed the self-assembly of cesium lead bromide (CsPbBr3) nanocrystals into ordered cuboidal supraparticles. These supraparticles maintain bright emission, crucial for opto-electronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Colloidal cesium lead bromide (CsPbBr3) nanocrystals (NCs) are vital for opto-electronic devices.
- Their self-assembly into larger structures is key to optimizing performance.
Purpose of the Study:
- To investigate the self-assembly of CsPbBr3 NCs into ordered cuboidal supraparticles (SPs).
- To characterize the structural and optical properties of these self-assembled SPs.
Main Methods:
- In situ X-ray scattering to monitor SP formation.
- High-angle annular dark-field scanning transmission electron microscopy and electron tomography for structural analysis.
- Monte Carlo simulations to understand assembly mechanisms.
Main Results:
- Homogeneous formation of cuboidal SPs observed with increasing NC concentration or nonsolvent addition.
- Atomic alignment of NCs within SPs, with evidence of localized NC vacancies.
- SPs exhibit bright emission, with a minor red shift compared to individual NCs.
Conclusions:
- CsPbBr3 NCs self-assemble into ordered SPs driven by NC-NC attractions.
- The structural integrity and optical properties of NCs are retained in SPs.
- Understanding NC vacancies is crucial for controlling self-assembly processes.
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