Unconventional polarization fatigue in van der Waals layered ferroelectric ionic conductor CuInP2S6
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Published:2023-12-12
Issue:1
Volume:14
Page:
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ISSN:2041-1723
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Container-title:Nature Communications
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language:en
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Short-container-title:Nat Commun
Author:
Zhou Ziwen, Wang Shun, Zhou Zhou, Hu Yiqi, Li Qiankun, Xue Jinshuo, Feng Zhijian, Yan Qingyu, Luo Zhongshen, Weng Yuyan, Tang Rujun, Su Xiaodong, Zheng Fengang, Okamoto Kazuki, Funakubo Hiroshi, Kang LixingORCID, Fang LiangORCID, You LuORCID
Abstract
AbstractRecent 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.
Funder
National Natural Science Foundation of China Natural Science Research of Jiangsu Higher Education Institutions of China Suzhou Municipal Science and Technology Bureau
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary
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