Don't worry, there are many formulas for perovskite. One may be low or no toxic and high efficiency while we're all still here.

Examples:

Strontium titanate

Calcium titanate

Lead titanate

Bismuth ferrite

Lanthanum ytterbium oxide

Silicate perovskite

Lanthanum manganite

Yttrium aluminum perovskite (YAP)

Lutetium aluminum perovskite (LuAP)

Solid solutions:

Lanthanum strontium manganite

LSAT (lanthanum aluminate – strontium aluminum tantalate)

Lead scandium tantalate

Lead zirconate titanate

Methylammonium lead halide