In this work, we report a polar-solvent-free, low-cost, and environmentally friendly method for synthesizing highly stable all-inorganic CsPbBr 3 nanocrystals (NCs). Their shape and size are controlled by adjusting key parameters in the synthesis, such as capping ligands as well as ultrasound power and radiation time. The CsPbBr 3 NCs are tunable from three-dimensional to two-dimensional and finally to 0-dimensional, by controlling the ratios and types of capping ligands. The CsPbBr 3 NCs exhibit optical properties dependent on their shape and size, with photoluminescence quantum yield as high as 83%. Moreover, the role of nonpolar solvents in improving the stability of the CsPbBr 3 NCs and the mechanism for the tunable growth of CsPbBr 3 NCs are studied and discussed. Controlled shape and size of perovskite NCs are desired for applications, including solar cells, lasers, light-emitting diodes, and solar concentrators.
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