Ba2 Sr2 I8

Ba₂Sr₂I₈ is a mixed halide perovskite semiconductor compound combining barium, strontium, and iodine in a layered crystal structure. This material is primarily of research interest for optoelectronic applications, particularly in next-generation photovoltaic devices and radiation detection, where the wide bandgap and high atomic number of the iodide component offer potential advantages over traditional single-cation halide perovskites. The dual-cation composition (barium and strontium) allows tuning of electronic properties and improved phase stability compared to monovalent perovskite alternatives, though the material remains largely in the development stage rather than established industrial production.