Sn2BiSI5

Sn₂BiSI₅ is a ternary semiconducting compound combining tin, bismuth, sulfur, and iodine—a material belonging to the emerging class of halide-based semiconductors with mixed metal cations. This compound is primarily of research interest for next-generation photovoltaic and optoelectronic applications, where it is being explored as a lead-free alternative to conventional perovskite absorbers; its mixed-valence structure and tunable bandgap make it a candidate for thin-film solar cells and light-emitting devices, though it remains largely in the development phase rather than commercial deployment.