Reversible “on–off” conversion and ultra-high temperature sensitivity of a zero-dimensional lead-free Cs2InBr5(H2O):Sb3+ perovskite

We observed that the water molecule in the Cs 2 InBr 5 (H 2 O):Sb 3+ molecular structure acts as a switch, facilitating an “on–off–on” cycle that can be repeated multiple times, overcoming the limitations of materials that exhibit singular responses.