Fig. 5: Vibrational fingerprints of fatigued CIPS.
From: Unconventional polarization fatigue in van der Waals layered ferroelectric ionic conductor CuInP2S6
a Optical image of the cross-sectional CIPS capacitor with both fatigued and pristine regions. b Raman spectra collected at the repective spots denoted in (a). The intensity of the spectra is normalized to P4 peak. c–f Left panel: schematic atomic motions of the related phonon modes labeled in (b). Right panel: corrsponding Raman spectra maps of respective phonon modes, presenting peak intensity, position and line width for P1 and P4 modes; peak intensity and position for P2 mode; peak intensity and mapping area for P3 mode.
