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Nanoscale ferroelectric 2D materials offer unique opportunity to investigatecurvature and strain effects on materials functionalities. Among these,CuInP2S6 (CIPS) has attracted tremendous research interest in recent years dueto combination of room temperature ferroelectricity, scalability to a fewlayers thickness, and unique ferrielectric properties due to coexistence of 2polar sublattices. Here, we explore the local curvature and strain effect onthe polarization in CIPS via piezoresponse force microscopy and spectroscopy.To explain the observed behaviors and decouple the curvature and strain effectsin 2D CIPS, we introduce finite element Landau-Ginzburg-Devonshire model. Theresults show that bending induces ferrielectric domains in CIPS, and thepolarization-voltage hysteresis loops differ in bending and non-bendingregions. Our simulation indicates that the flexoelectric effect can affectlocal polarization hysteresis. These studies open a novel pathway for thefabrication of curvature-engineered nanoelectronic devices.

Disentangling stress and curvature effects in layered 2D ferroelectric CuInP2S6