当前位置：
X-MOL 学术
›
ACS Appl. Mater. Interfaces
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Ionic Control over Ferroelectricity in 2D Layered van der Waals Capacitors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-01-05 , DOI: 10.1021/acsami.1c18683 Sabine M Neumayer 1 , Mengwei Si 2 , Junkang Li 2 , Pai-Ying Liao 2 , Lei Tao 3, 4 , Andrew O'Hara 3 , Sokrates T Pantelides 3, 5 , Peide D Ye 2 , Petro Maksymovych 1 , Nina Balke 1, 6
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-01-05 , DOI: 10.1021/acsami.1c18683 Sabine M Neumayer 1 , Mengwei Si 2 , Junkang Li 2 , Pai-Ying Liao 2 , Lei Tao 3, 4 , Andrew O'Hara 3 , Sokrates T Pantelides 3, 5 , Peide D Ye 2 , Petro Maksymovych 1 , Nina Balke 1, 6
Affiliation
|
The van der Waals layered material CuInP2S6 features interesting functional behavior, including the existence of four uniaxial polarization states, polarization reversal against the electric field through Cu ion migration, a negative-capacitance regime, and reversible extraction of Cu ions. At the heart of these characteristics lies the high mobility of Cu ions, which also determines the spontaneous polarization. Therefore, Cu migration across the lattice results in unusual ferroelectric behavior. Here, we demonstrate how the interplay of polar and ionic properties provides a path to ionically controlled ferroelectric behavior, achieved by applying selected DC voltage pulses and subsequently probing ferroelectric switching during fast triangular voltage sweeps. Using current measurements and theoretical calculations, we observe that increasing DC pulse duration results in higher ionic currents, the buildup of an internal electric field that shifts polarization loops, and an increase in total switchable polarization by ∼50% due to the existence of a high polarization phase which is stabilized by the internal electric field. Apart from tuning ferroelectric behavior by selected square pulses, hysteretic polarization switching can even be entirely deactivated and reactivated, resulting in three-state systems where polarization switching is either inhibited or can be performed in two different directions.
中文翻译：
二维层状范德华电容器中铁电性的离子控制
范德华层状材料 CuInP 2 S 6具有有趣的功能行为，包括四种单轴极化状态的存在、通过铜离子迁移对电场进行极化反转、负电容方案和铜离子的可逆提取。这些特性的核心在于铜离子的高迁移率，这也决定了自发极化。因此，Cu 跨晶格迁移导致不寻常的铁电行为。在这里，我们展示了极性和离子特性的相互作用如何为离子控制铁电行为提供途径，通过应用选定的直流电压脉冲并随后在快速三角电压扫描期间探测铁电切换来实现。使用电流测量和理论计算，我们观察到，增加直流脉冲持续时间会导致更高的离子电流，产生改变极化回路的内部电场，并且由于存在由内部电场。除了通过选定的方脉冲调整铁电行为外，迟滞极化切换甚至可以完全停用和重新激活，从而形成三态系统，其中极化切换要么被抑制，要么可以在两个不同的方向上执行。
更新日期：2022-01-19
中文翻译：
二维层状范德华电容器中铁电性的离子控制
范德华层状材料 CuInP 2 S 6具有有趣的功能行为，包括四种单轴极化状态的存在、通过铜离子迁移对电场进行极化反转、负电容方案和铜离子的可逆提取。这些特性的核心在于铜离子的高迁移率，这也决定了自发极化。因此，Cu 跨晶格迁移导致不寻常的铁电行为。在这里，我们展示了极性和离子特性的相互作用如何为离子控制铁电行为提供途径，通过应用选定的直流电压脉冲并随后在快速三角电压扫描期间探测铁电切换来实现。使用电流测量和理论计算，我们观察到，增加直流脉冲持续时间会导致更高的离子电流，产生改变极化回路的内部电场，并且由于存在由内部电场。除了通过选定的方脉冲调整铁电行为外，迟滞极化切换甚至可以完全停用和重新激活，从而形成三态系统，其中极化切换要么被抑制，要么可以在两个不同的方向上执行。
京公网安备 11010802027423号