Anomalous polarization switching and permanent retention in a ferroelectric ionic conductor

Zhou, Shuang; You, Lü; Chaturvedi, Apoorva; Morris, Samuel A.; Herrin, J. S.; Zhang, Na; Abdelsamie, Amr; Hu, Yuzhong; Chen, Jieqiong; Zhou, Yang; Dong, Shuai; Wang, Junling

doi:10.1039/c9mh01215j

Cited by 103 publications

(133 citation statements)

References 89 publications

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“…[28] In addition, CIPS has a high Cu-ion conductivity that extends into the temperature range of the ferroelectric phase. [30][31][32] It has been shown that in-plane ionic currents can be used to manipulate ferroelectric polarization. [33] These highly unusual properties that are rooted in the vdW structure provide the opportunity for complex polarization switching which might be exploited in transient-NC devices beyond the mechanisms discussed above.…”

Section: Introductionmentioning

confidence: 99%

The Concept of Negative Capacitance in Ionically Conductive Van der Waals Ferroelectrics

Neumayer

Lei

O’Hara

et al. 2020

Advanced Energy Materials

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Negative capacitance (NC) provides a path to overcome the Boltzmann limit that dictates operating voltages in transistors and, therefore, may open up a path to the challenging proposition of lowering energy consumption and waste heat in nanoelectronic integrated circuits. Typically, NC effects in ferroelectric materials are based on either stabilizing a zero‐polarization state or slowing down ferroelectric switching in order to access NC regimes of the free‐energy distribution. Here, a fundamentally different mechanism for NC, based on CuInP2S6, a van der Waals layered ferrielectric, is demonstrated. Using density functional theory and piezoresponse force microscopy, it is shown that an unusual combination of high Cu‐ion mobility and its crucial role in determining polarization magnitude and orientation (P) leads to a negative slope of the polarization versus the electric field E, dP/dE < 0, which is a requirement for NC. This mechanism for NC is likely to occur in a wide class of materials, offering new possibilities for NC‐based devices. The nanoscale demonstration of this mechanism can be extended to the device‐level by increasing the regions of homogeneous polarization and polarization switching, for example, through strain engineering and carefully selected electric field pulses.

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Section: Introductionmentioning

confidence: 99%

The Concept of Negative Capacitance in Ionically Conductive Van der Waals Ferroelectrics

Neumayer

Lei

O’Hara

et al. 2020

Advanced Energy Materials

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“…This article also can be found at http://journal.hep.com.cn/fop/EN/10.1007/s11467-020-0998-9 layer lead to exotic negative piezoelectricity, which is the second experimentally confirmed one (and the first in inorganic materials) [5]. Also, thanks to the high mobility of small copper ions and loose framework, the ionic conduction is prominent in this system [7], an uncommon property for ferroelectric materials and important for ionic battery applications.…”

mentioning

confidence: 65%

Ferroelectric “gourd” goes into vdW atomic cage

Dong

2020

Front. Phys.

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“…Recently CuInP 2 S 6 (CIPS), a typical room-temperature van der Waals (vdW) layered ferroelectric crystal 19,20,21 , has attracted intensive attention due to its unexpected features including giant negative piezoelectricity 22 , tunable quadruple-well ferroelectric nature 23 , negative capacitance characteristic 24 and the interplay between ferroelectricity and ionic conductivity 25,26,27 . These unique characteristics not only bring new insights into the fundamental research 28,29 , but also provide new opportunities for diverse applications of layered ferroelectrics 30,31 .…”

Section: Introductionmentioning

confidence: 99%

Ion adsorption-induced reversible polarization switching of a van der Waals layered ferroelectric

et al. 2020

Preprint

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Solid-liquid interface is a key concept of many research fields, enabling numerous physical phenomena and practical applications. For example, electrode-electrolyte interfaces with electric double layers have been widely used in energy storage and regulating physical properties of functional materials. Creating a specific interface allows emergent functionalities and effects. Here, we show the artificial control of ferroelectric-liquid interfacial structures to switch polarization states reversibly in a van der Waals layered ferroelectric CuInP2S6. We discover that upward and downward polarization states can be induced by spontaneous physical adsorption of anions [DDBS] and cations [DEME], respectively, at the ferroelectric-liquid interface. This distinctive approach circumvents the structural damage of CIPS caused by Cu-ion conductivity during electrical switching process. Moreover, the polarized state features super-long retention time (> 1 year). The interplay between ferroelectric dipoles and adsorbed organic ions has been studied systematically by comparative experiments and first-principles calculations. Such ion adsorption-induced reversible polarization switching in a van der Waals ferroelectric enriches the functionalities of solid-liquid interfaces, offering opportunities for liquid-controlled two-dimensional ferroelectric-based devices.

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Anomalous polarization switching and permanent retention in a ferroelectric ionic conductor

Abstract: Ionic conduction in a ferroelectric leads to anomalous polarization switching kinetics but prevents retention failure.

Cited by 103 publications

References 89 publications

The Concept of Negative Capacitance in Ionically Conductive Van der Waals Ferroelectrics

The Concept of Negative Capacitance in Ionically Conductive Van der Waals Ferroelectrics

Ferroelectric “gourd” goes into vdW atomic cage

Ion adsorption-induced reversible polarization switching of a van der Waals layered ferroelectric

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