Fig. 3: Switching mechanism of the anomalous FePV behavior in CIPS.
From: Configurable kinetics of polarization switching via ion migration in ferroionic CuInP2S6
a Response of Isc while applying repetitive Vp with decreasing from 9 to −11.4 V. A Vp (11.4 V, 2 ms) is used as reset voltage to obtain an initial Pdown state, denoted by red arrow. b Response of Isc as the repetitive Vp increases from −9.6 to 11.4 V, where a Vp (−11.4 V, 2 ms) is adopted to reset the device, forming another initial Pup state, denoted by blue arrow. c Evolution of Cu ions distribution while applying cyclic scanning Vp, where the focused Cu ions are denoted by the black dashed box to present ion migration paths. Cu ions in LP and HP states are depicted by the blue and red spheres, respectively, and downward polarization (−LP/−HP) and upward polarization (+LP/+HP) are uniformly named Pdown and Pup, illustrated in the inset.
