Synthesis and Characterization of Two-dimensional Cs2AgInCl6 Nanoplates as Building Blocks for Functional Surfaces

TL;DR

This study presents a novel synthesis of two-dimensional Cs2AgInCl6 nanoplates with broken symmetry, enhancing their optical properties and potential as building blocks for functional surface assemblies.

Contribution

It introduces a new colloidal synthesis method for high-quality Cs2AgInCl6 nanoplates with symmetry-breaking features, including shape and heterointerfaces, and demonstrates their transformation into nanosheets.

Findings

Nanoplates exhibit distinct optical properties from nanocubes.

Decorated nanoplates with metallic silver nanoparticles enhance symmetry breaking.

Nanoplates can transform into larger nanosheets on substrates.

Abstract

Breaking crystal symmetry is essential for engineering emissive double perovskite metal halides. The goal is to overcome their inherently indirect and disallowed optical transitions. Here we introduce a synthesis for silver - Cs2AgInCl6 two-dimensional hybrid nanoplate products that break the symmetry in two ways, their shape and their heterointerfaces. A comparative study between Cs2AgInCl6 nanocubes and nanoplates is presented to emphasize the difference in optical properties. A modified colloidal synthesis for Cs2AgInCl6 yields high-quality nanoplates with small lateral dimensions very different from the symmetric cubes. Each nanoplate is decorated with metallic silver nanoparticles, with diameters on the scale of the thickness of the perovskite nanoplate, forming significant heterointerfaces that further break symmetry. The Cs2AgInCl6 two-dimensional nanoplates also demonstrate facile transformation into larger crystalline nanosheets once deposited on substrates. We thus highlight those nanoplates as potential building blocks for assemblies of functional surfaces.