Work

Core@Shell AgBr@CsPbBr 3 Nanocrystals as Precursors to Hollow Lead Halide Perovskite Nanocubes

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide We report the synthesis of colloidal core@shell AgBr@CsPbBr 3 nanocubes by a one-pot approach, where the nucleation and growth of AgBr nanocrystals occurs rapidly after the injection of chemical precursors. This is immediately followed by the overgrowth of CsPbBr 3, delivering AgBr@CsPbBr 3 nanocubes of several tens of nanometers in size, with the volume of the AgBr core being only a small fraction of the overall nanocrystal volume. The formation of a core@shell geometry is facilitated by the epitaxial compatibility between AgBr and CsPbBr 3 along multiple crystallographic directions. Exchange with Cl – ions leads to Ag@CsPbCl 3 nanocubes, whereas exchange with I – ions leads to hollow CsPbI 3 nanocubes, due to selective etching of the AgBr (or Ag) core region by the I – ions diffusing in the nanocubes. These hollow CsPbI 3 nanocubes can then be converted into hollow CsPbBr 3 and CsPbCl 3 nanocubes by halide exchange. The optical emission properties of the hollow CsPbX 3 (X = Cl, Br, I) nanocubes are in line with those expected from large, non-hollow halide perovskite nanocrystals, indicating that the small hollow region in the cubes has no major influence on their optical properties.

Source: Journal of the American Chemical Society

DOI: 10.1021/jacs.5c07200