Issue 22, 2023

Promoting solution-phase superlattices of CsPbBr3 nanocrystals

Abstract

We present a size-selective method for purifying and isolating perovskite CsPbBr3 nanocrystals (NCs) that preserves their as-synthesized surface chemistry and extremely high photoluminescence quantum yields (PLQYs). The isolation procedure is based on the stepwise evaporation of nonpolar co-solvents with high vapor pressure to promote precipitation of a size-selected product. As the sample fractions become more uniform in size, we observe that the NCs self-assemble into colloidally stable, solution-phase superlattices (SLs). Small angle X-ray scattering (SAXS) and dynamic light scattering (DLS) studies show that the solution-phase SLs contain 1000s of NCs per supercrystal in a simple cubic, face-to-face packing arrangement. The SLs also display systematically faster radiative decay dynamics and improved PLQYs, as well as unique spectral absorption features likely resulting from inter-particle electronic coupling effects. This study is the first demonstration of solution-phase CsPbBr3 SLs and highlights their potential for achieving collective optoelectronic phenomena previously observed from solid-state assemblies.

Graphical abstract: Promoting solution-phase superlattices of CsPbBr3 nanocrystals

Article information

Article type
Paper
Submitted
14 Febr. 2023
Accepted
27 Apr. 2023
First published
09 Maijs 2023

Nanoscale, 2023,15, 9728-9737

Author version available

Promoting solution-phase superlattices of CsPbBr3 nanocrystals

N. Mireles Villegas, J. C. Hernandez, J. C. John and M. Sheldon, Nanoscale, 2023, 15, 9728 DOI: 10.1039/D3NR00693J

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