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Unconventional polarization fatigue in van der Waals layered ferroelectric ionic conductor CuInP2S6

Author

Listed:
  • Ziwen Zhou

    (Soochow University)

  • Shun Wang

    (Soochow University)

  • Zhou Zhou

    (Soochow University)

  • Yiqi Hu

    (Soochow University)

  • Qiankun Li

    (Soochow University)

  • Jinshuo Xue

    (Soochow University)

  • Zhijian Feng

    (Soochow University)

  • Qingyu Yan

    (Soochow University)

  • Zhongshen Luo

    (Soochow University)

  • Yuyan Weng

    (Soochow University)

  • Rujun Tang

    (Soochow University)

  • Xiaodong Su

    (Soochow University)

  • Fengang Zheng

    (Soochow University)

  • Kazuki Okamoto

    (Tokyo Institute of Technology)

  • Hiroshi Funakubo

    (Tokyo Institute of Technology)

  • Lixing Kang

    (Chinese Academy of Sciences)

  • Liang Fang

    (Soochow University)

  • Lu You

    (Soochow University)

Abstract

Recent progress in two-dimensional ferroelectrics greatly expands the versatility and tunability in van der Waals heterostructure based electronics. However, the switching endurance issue that widely plagues conventional ferroelectrics in practical applications is hitherto unexplored for van der Waals layered ferroelectrics. Herein, we report the observation of unusual polarization fatigue behaviors in van der Waals layered CuInP2S6, which also possesses finite ionic conductivity at room temperature. The strong intertwinement of the short-range polarization switching and long-range ionic movement in conjunction with the van der Waals layered structure gives rise to unique morphological and polarization evolutions under repetitive electric cycles. With the help of concerted chemical, structural, lattice vibrational and dielectric analyses, we unravel the critical role of the synergy of ionic migration and surface oxidation on the anomalous polarization enhancement and the eventual polarization degradation. This work provides a general insight into the polarization fatigue characteristics in ionically-active van der Waals ferroelectrics and delivers potential solutions for the realization of fatigue-free capacitors.

Suggested Citation

  • Ziwen Zhou & Shun Wang & Zhou Zhou & Yiqi Hu & Qiankun Li & Jinshuo Xue & Zhijian Feng & Qingyu Yan & Zhongshen Luo & Yuyan Weng & Rujun Tang & Xiaodong Su & Fengang Zheng & Kazuki Okamoto & Hiroshi F, 2023. "Unconventional polarization fatigue in van der Waals layered ferroelectric ionic conductor CuInP2S6," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-44132-y
    DOI: 10.1038/s41467-023-44132-y
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    References listed on IDEAS

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    1. Fei Li & Shujun Zhang & Tiannan Yang & Zhuo Xu & Nan Zhang & Gang Liu & Jianjun Wang & Jianli Wang & Zhenxiang Cheng & Zuo-Guang Ye & Jun Luo & Thomas R. Shrout & Long-Qing Chen, 2016. "The origin of ultrahigh piezoelectricity in relaxor-ferroelectric solid solution crystals," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    2. B. H. Park & B. S. Kang & S. D. Bu & T. W. Noh & J. Lee & W. Jo, 1999. "Lanthanum-substituted bismuth titanate for use in non-volatile memories," Nature, Nature, vol. 401(6754), pages 682-684, October.
    3. Anton V. Ievlev & Santosh KC & Rama K. Vasudevan & Yunseok Kim & Xiaoli Lu & Marin Alexe & Valentino R. Cooper & Sergei V. Kalinin & Olga S. Ovchinnikova, 2019. "Non-conventional mechanism of ferroelectric fatigue via cation migration," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
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