Direct Room Temperature Synthesis of a-CsPbI3 Perovskite Nanocrystals with High Photoluminescence Quantum Yields: Implications for Lighting and Photovoltaic Applications

Cesium-lead iodide perovskite nanocrystal (PNC) is a promising material for efficient solar cells and red-light-emitting diodes, especially for the cubic-structured alpha polymorph with its ideal band-gap energy. We report the first room temperature, one-pot synthesis of alpha-CsPbI3 PNCs in open air, achieved by optimized ligand-solvent combinations to control the crystallization kinetics and phase preference of CsPbI3. The resulting 6.0-nm-sized, alpha-phase nanocubes have photoluminescence peaks at 642 nm (full-width at half-maximum: 44 nm) and absolute quantum yields of up to 83% after purification. The method is simple, reproducible, scalable, and generalizable to other cesium-lead halide and formamidinium lead iodide PNCs.

Automated summary

In this study, a simple, reproducible, and scalable method was developed for the synthesis of alpha-CsPbI3 perovskite nanocrystals in open air at room temperature. The resulting nanocrystals exhibited ideal band-gap energy and high quantum yields, making them a promising material for efficient solar cells and light-emitting diodes.