High quality CuInP2S6 single crystal for intrinsic electric property

What is the nature of the electric (dielectric/ferroelectric) properties of CuInP 2 S 6 (CIPS)? CIPS, considered an emerging two-dimensional (2D) ferroelectric, has been well explored in various properties and applications. However, the most important and fundamental nature, i.e. dielectric/ferroelectric property, has been controversial, because high-quality CIPS samples are grossly deficient. In this work, single crystal CIPS is successfully synthesized by the chemical vapour transport method, which presents “high quality” in terms of high purity, excellent crystallinity, uniform composition, and defect-free structure etc . that are confirmed through comprehensive characterization techniques. With performing high-quality single crystal, we fully uncover the intrinsic electric properties of CIPS through accurately identifying the atomic arrangement, electron configuration, magnetic, dielectric, and ferroelectric properties that should reach a consensus on such a disputed CIPS material. These findings serve as a pivotal benchmark for a comprehensive understanding of the inherent electric characteristics of CIPS, offering valuable insights for its future modifications and applications in various applications. • Large-area, high-quality CIPS single crystals have been synthesized for the first time. • “High quality” natures have been comprehensively verified for the first time. • Nature of the electric properties has been revealed for the first time.