Solution-Based Synthesis of Cesium Bismuth Halide Perovskite Nanocrystals for Optoelectronic Applications

Lead halide perovskite materials, such as methylammonium lead iodide, are interesting for a variety of optoelectronic applications. However, halide perovskites suffer from instability upon exposure to atmospheric conditions, thus much research in the area seeks to improve their stability. Bismuth halide perovskites are a potential alternative that are relatively unexplored, but have promising initial performance and are predicted to have similar properties to lead-based perovskites.

This work reports the synthesis of cesium bismuth halide perovskite nanocrystals using solution-based methods. The Bi-perovskite nanocrystals show improved phase-stability compared to Pb-based perovskite nanocrystals. Transmission electron microscopy and X-ray diffraction were used to characterize nanoparticle morphology and crystal structure. Absorbance and photoluminescence measurements of these nanocrystals reveal tunable optical properties. These Bi-based perovskite nanocrystals have potential for high performance, stable, and non-toxic solution-processable optoelectronics.