Crystallographic stability is an important factor that affects the stability of perovskites. The
stability dictates the commercial applications of lead-based organometal halide perovskites.
The tolerance factor (t) and octahedral factor (μ) form the state-of-the-art criteria used to
evaluate the perovskite crystallographic stability. We studied the crystallographic stabilities
of halide and chalcogenide perovskites by exploring an effective alternative descriptor, the
global instability index (GII) that was used as an indicator of the stability of perovskite oxides …