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Research day observed at SRM Institute of Science & Technology

Research day observed at SRM Institute of Science & Technology
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"Ferroelectricity and Piezoelectricity in 2D Van der Waals CuInP2S6 Fer" by Tingting Jia, Yanrong Chen et al.

CuInP2S6 (CIPS) is a novel two-dimensional (2D) van der Waals (vdW) ferroelectric layered material with a Curie temperature of TC~315 K, making it promising for great potential applications in electronic and photoelectric devices. Herein, the ferroelectric and electric properties of CIPS at different thicknesses are carefully evaluated by scanning probe microscopy techniques. Some defects in some local regions due to Cu deficiency lead to a CuInP2S6–In4/3P2S6 (CIPS–IPS) paraelectric phase coexisting with the CIPS ferroelectric phase. An electrochemical strain microscopy (ESM) study reveals that the relaxation times corresponding to the Cu ions and the IPS ionospheres are not the same, with a significant difference in their response to DC voltage, related to the rectification effect of the ferroelectric tunnel junction (FTJ). The electric properties of the FTJ indicate Cu+ ion migration and propose that the current flow and device performance are dynamically controlled by an interfa ....

Ferroelectric Properties , Egative Piezoelectricity , Phase Segregation , Scanning Probe Microscope , Two Dimensional Materials ,