(BA)₁₀AgBi₂Br₁₉: a one-dimensional halide double perovskite with a unique Br trimer

Area of Science:

• Materials Science
• Solid-State Chemistry
• Crystallography

Background:

• Halide double perovskites are typically 3D structures.
• Exploring lower-dimensional perovskites is crucial for novel properties.

Purpose of the Study:

• To synthesize and characterize a novel one-dimensional (1D) halide double perovskite.
• To investigate the structural and electronic properties of this new material.

Main Methods:

• Single crystal X-ray diffraction for structural determination.
• UV-Vis spectroscopy for band gap measurement.

Main Results:

• Successful synthesis of (BA)₁₀AgBi₂Br₁₉, a 1D halide double perovskite.
• The structure features 1D corner-sharing perovskite ribbons (three octahedra wide).
• An unexpected narrow band gap of 2.46 eV was observed, attributed to a unique bromine trimer.

Conclusions:

• This work reports the first 1D derivative of a halide double perovskite.
• The unique structural motif, specifically the Br trimer, significantly influences the electronic band gap.