Ultra-High-Density Ferroelectric Array Formed by Sliding Ferroelectric Moiré Superlattices.
basic_science · Level V
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- Record sourced from PubMed, PMID 38047724.
- Also identified by DOI 10.1021/acs.nanolett.3c03822.
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Abstract
2D van der Waals (vdW) materials offer infinite possibilities for constructing unique ferroelectrics through simple layer stacking and rotation. In this work, we stack nonferroelectric GeS<sub>2</sub> and ferroelectric CuInP<sub>2</sub>S<sub>6</sub> to form heterostructures by combining sliding ferroelectric polarization with displacement ferroelectric polarization to achieve multiple polarization states. First-principles calculations reveal that the polarization reversal of the CuInP<sub>2</sub>S<sub>6</sub> component in the GeS<sub>2</sub>/CuInP<sub>2</sub>S<sub>6</sub>/GeS<sub>2</sub> heterostructure can simultaneously drive the switching of sliding ferroelectric polarization, displaying a robust coupling of the two polarizations and leading to the overall polarization switching. Based on this, ferroelectric arrays with a density of 6.55 × 10<sup>12</sup> cm<sup>-2</sup> (equivalent to a storage density of 0.7 TB cm<sup>-2</sup>) were constructed in a moiré superlattice, and the polarization strength of array elements was 11.77 pC/m, higher than that of all reported 2D vdW out-of-plane ferroelectrics. High density, large polarization, and electrically switchable array elements in ferroelectric arrays provide unprecedented opportunities to design 2D high-density nonvolatile ferroelectric memories.