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Updated: Sep 19, 2025
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Unconventional Thermal Stability of Domain Framework in Ferroelectric CuInP2S6
Lei Yang1, Yun-Zhe Zheng1, Abliz Mattursun1
1Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai 200241, China.
Abstract:
Achieving stable and persistent polarization characteristics in ferroelectric (FE) materials is crucial for fabricating high-density, low-power multifunctional memories. In this study, we conducted a comprehensive investigation of the 2D FE material CuInP2S6 (CIPS), employing piezoelectric force microscopy (PFM), scanning transmission electron microscopy (STEM), and Raman spectroscopy. By comparing CIPS with and without the nonferroelectric (NFE) phase, we observed unexpected stability of the domain framework at high temperatures. This was evidenced by in situ temperature-dependent PFM measurements and Raman spectra. STEM analysis revealed Cu ion defects and charge accumulation at the FE/NFE interface, which contributed to the thermal stability due to a strong pinning effect. This work highlights the significant positive impact of NFE phases on the thermal stability of FE CIPS, providing insights into the development of controllable FE polarization switching and the potential application of highly reliable and durable multifunctional devices.
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