Strontium bromide hexahydrate is an inorganic salt with the chemical formula SrBr₂·6H₂O. It appears as colorless or white deliquescent crystals and is highly soluble in water. This compound serves as a source of strontium (Sr²⁺) and bromide (Br⁻) ions. Its primary and most significant modern application is in the field of materials science, specifically in the development of perovskite solar cells (PSCs). Strontium bromide is used as a precursor for modifying perovskite layers, such as in the synthesis of CsPbBr₃-based perovskites or as an additive to enhance the stability and performance of photovoltaic devices. The incorporation of strontium ions can help passivate defects and improve the crystal quality of the perovskite film. Beyond its specialized role in optoelectronics, strontium bromide is also utilized as a general laboratory reagent in inorganic synthesis and analytical chemistry. It finds historical use in medicine as a sedative and anticonvulsant, though this application is now obsolete. Due to its hygroscopic nature, it requires storage in a dry environment.