All-inorganic halide perovskite semiconductors, in particular CsPbBr3, prepared by solution processes have recently gained wide interest for their application in solar cells, optoelectronics and artificial photosynthesis, reaching high efficiencies and relatively high stability, while offering a relatively simple and low-cost processability. Despite these achievements, their scalability is compromised by the use of organic solvents, surfactants, and difficult to control solution processes. Here we report a fast, solvent and surfactant free, mechanochemical synthesis of CsPbBr3 perovskite nanocrystals with scale-up capability and control over crystal size. These perovskite nanocrystals have nanorod shape and show excellent crystallinity and high values of size-dependent fluorescence quantum yield. Their size and properties are finely tuned by changing the mechanochemical reaction conditions such as ball milling time and size. Furthermore, for the first time, we explore their use for selective photocatalytic hydrogenation of CO2 to methanol and opening up a new research direction for halide perovskites in heterogenous photocatalysis. Considering the key role of size and morphology in optoelectronics, photovoltaics and photocatalysis and the unique physical and electronic properties of halide perovskites, their mechanochemical synthesis is likely to open up the scope and utility of these materials.

Mechanochemical synthesis of all-Inorganic CsPbBr3 nanorods and their use in selective photocatalytic hydrogenation of CO2

2019 Spring National Meeting

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