Metal-halide perovskite

A metal-halide perovskite is a crystalline material in which a halide-based framework adopts the perovskite structure or a related arrangement. In the common $AB{X}_3$ description, $B$ is a metal cation, $X$ a halide and $A$ a larger charge-balancing cation, which can be inorganic or molecular.

Connectivity and distortion of the metal–halide framework influence electronic structure and optical absorption. This makes the family important in solar cells and light-emitting devices. The structural name alone does not specify one composition, stability or band gap; substitutions, dimensionality and defects can change those properties.