Solvent-free, mechanochemical syntheses of bulk trihalide perovskites and their nanoparticles.

For the first time, we have synthesized APbBr (A = Cs/MA/FA, where MA = CHNH and FA = CH(NH)) bulk as well as nanoparticles (NPs) by solid-state reactions at room temperature. This facile strategy yields different shape structures e.g.