Lead bromide trihydrate (PbBr₂·3H₂O) is a key precursor in the synthesis of perovskite materials for solar cells. It is used to form lead halide perovskites, such as methylammonium lead bromide (MAPbBr₃), which serve as the light-absorbing layer in perovskite solar cells. These perovskites enable high photovoltaic efficiency and low-cost fabrication. PbBr₂·3H₂O contributes to the formation of crystalline structures that efficiently transport charge carriers. It is also employed in the preparation of perovskites for optoelectronic applications, including light-emitting diodes (LEDs) and photodetectors, due to the resulting materials' strong luminescence and tunable bandgap. The compound itself is sensitive to moisture, requiring controlled handling and storage.