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 Feb 2023
Accepted
27 Apr 2023
First published
09 Mai 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements