Ultrasound-induced synthesis of all-inorganic lead perovskite quantum dots: fast, simple, and highly reproducible

Abstract

All-inorganic perovskite quantum dots (QDs), due to their outstanding power conversion efficiency, narrow and tunable emission band, and strong absorption, have attracted much scientific interest lately. They already found applications in optoelectronic as materials for light-emitting diodes, solar cells, photodetectors, or lasers. Due to the increased demand for QDs in larger quantities, simple, easy, and highly reproducible routes for synthesizing well-defined all-inorganic lead perovskite QDs remain very desirable. This study presents a novel approach to obtain perovskite QDs that could emit at any wavelength in the visible light range. Within this study, the crucial parameters, such as synthesis temperature, isolation conditions, or optical density on the changes in optical properties, were taken into account. The detailed verification of different parameters showed that the proposed ultrasound-induced synthesis method is superior to the conventional hot-injection method since it offers not only the higher reproducibility but also significantly shorter synthesis time, i.e. from several hours via the traditional hot-injection method to merely 20–30 min by our proposed method.