Microfluidics-based synthesis of lead cesium bromide perovskite microcrystals

Microfluidics is a promising technique for controllable synthesis of nanostructured materials that allows to conduct an experimental procedure at ambient conditions and, more importantly, enables faster synthesis process. Moreover, manipulation of the flows in the channels of microfluidic chips allows controlling the reagent's ratio, which leads to precise synthesis of nanostructures of different morphology. In the present work polydimethylsiloxane (PDMS) microfluidic chips were developed in order to control synthesis of lead cesium bromide (CsPbBr₃) perovskite microcrystals by varying flow rates of reagents in microchannels. The optical properties of the obtained perovskite microparticles were characterized. Our data reveal that microfluidics enables to tune morphology of perovskite microstructures by changing the external conditions of flows.