Issue 37, 2024

Growth mechanism of oleylammonium-based tin and lead bromide perovskite nanostructures

Abstract

Metal halide perovskites, particularly using tin and lead as bivalent cations, are well known for their synthetic versatility and ion mobility. These materials possess intriguing ionic properties that allow the formation of 2D Ruddlesden–Popper (RP) and 3D metal halide perovskite nanocrystals (NCs) under similar synthetic conditions. We studied the synthesis mechanism of oleylammonium-based Sn and Pb bromide perovskites 2D Ruddlesden–Popper (RP) in comparison with the 3D CsPbBr3 and CsSnBr3 NCs. Using experimental techniques in combination with theoretical calculations, we studied the interactions of the long-chain organic cations with the inorganic layers and between each other to assess their stability. Our findings suggest that tin bromide is more inclined toward forming higher-order RP phases or 3D NCs than lead bromide. Furthermore, we demonstrate the synthesis of precisely tuned CsSnBr3 3D NCs (7 and 10 nm) using standard surface ligands. When the 3D and 2D tin halide perovskite nanostructures coexist in suspension, the obtained drop-cast thin films showed the preferential positioning of residual RP nanostructures at the interface with the substrate. This study encourages further exploration of low-dimensional hybrid materials and emphasizes the need for understanding mechanisms to develop efficient synthetic routes for high-quality tin-halide perovskite NCs.

Graphical abstract: Growth mechanism of oleylammonium-based tin and lead bromide perovskite nanostructures

Supplementary files

Article information

Article type
Paper
Submitted
16 May 2024
Accepted
12 Aug 2024
First published
13 Aug 2024
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2024,12, 15152-15162

Growth mechanism of oleylammonium-based tin and lead bromide perovskite nanostructures

K. Gahlot, J. N. Kraft, M. Pérez-Escribano, R. M. Koushki, M. Ahmadi, E. Ortí, B. J. Kooi, G. Portale, J. Calbo and L. Protesescu, J. Mater. Chem. C, 2024, 12, 15152 DOI: 10.1039/D4TC02029D

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