Perovskite materials are highly regarded for their optoelectronic properties, yet their low thermodynamic stability has posed a significant challenge in their advancement and implementation . Inorganic metal halide perovskites (MHPs), such as CsPbI 3 and CsSnI 3 , exhibit optically activity in the high-temperature perovskite black α phase, but under ambient conditions, their thermodynamically stable state is the optically inactive non-perovskite yellow δ phase . The structural disparity between the black and yellow phases of inorganic MHPs is considerable, and the black-yellow (B↔Y) phase transition involves overcoming substantial energy barriers (1-2 eV), rendering the transition path complex . Density functional theory (DFT) calculation studies have been predicted that CsPbI 3 transitioning from the black phase to the yellow phase via a direct one-step pathway requires overcoming a barrier of 68 meV/atom , which can be reduced to 31 meV/atom through a multi-step process involving four transition states and three metastable states . Classical molecular dynamics (MD) simulations have predicted a different transition mechanism that the yellow phase of CsPbI 3 transforms into a liquid-like disordered structure at high temperatures before recrystallizing into the black phase . Experimental validation of the atomic-level transition mechanism is currently infeasible, leaving the underlying mechanism unclear.