铁电门控对 VO2 中金属-绝缘体转变的非易失性控制,Advanced Materials

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铁电门控对 VO2 中金属-绝缘体转变的非易失性控制
Advanced Materials ( IF 27.4 ) Pub Date : 2022-06-17 , DOI: 10.1002/adma.202203097
Yoon Jung Lee ₁ , Kootak Hong _{1,

2} , Kyeongho Na ₃ , Jiwoong Yang ₃ , Tae Hyung Lee ₁ , Byungsoo Kim ₁ , Chung Wung Bark ₄ , Jae Young Kim ₁ , Sung Hyuk Park ₁ , Sanghan Lee ₃ , Ho Won Jang _{1,

5}

Affiliation

控制相关材料中的相变会产生新的功能特性，为未来的电子产品提供新的方面以及对凝聚态系统的基本理解。使用具有代表性的相关材料二氧化钒 (VO ₂ )，通过采用具有铁电 BiFeO ₃ (BFO) 层的异质外延结构来调节相关电子的相互作用，开发了一种控制金属-绝缘体转变 (MIT) 行为的方法。由于缺陷减轻的界面，通过显示 VO _{2的 MIT 的非易失性控制，成功地证明了相关电子和铁电极化之间的增强耦合}在室温下。铁电可调 MIT 可以通过剩余极化为 80 µC cm ^{-2的 Mott 晶体管 (VO}₂ /BFO/SrRuO ₃ ) 实现，通过具有大开/关比的可逆电导导致非易失性 MIT 行为(≈10 ² )、长保留时间(≈10 ⁴ s)和高耐久性(≈10 ³个循环)。此外，通过原位拉曼映射分析，铁电极化证实了VO ₂的结构相变。该研究为异质外延相关材料提供了新颖的设计原则，并提供了调节多功能特性的创新见解。

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Nonvolatile Control of Metal–Insulator Transition in VO2 by Ferroelectric Gating

Controlling phase transitions in correlated materials yields emergent functional properties, providing new aspects to future electronics and a fundamental understanding of condensed matter systems. With vanadium dioxide (VO₂), a representative correlated material, an approach to control a metal–insulator transition (MIT) behavior is developed by employing a heteroepitaxial structure with a ferroelectric BiFeO₃ (BFO) layer to modulate the interaction of correlated electrons. Owing to the defect-alleviated interfaces, the enhanced coupling between the correlated electrons and ferroelectric polarization is successfully demonstrated by showing a nonvolatile control of MIT of VO₂ at room temperature. The ferroelectrically-tunable MIT can be realized through the Mott transistor (VO₂/BFO/SrRuO₃) with a remanent polarization of 80 µC cm⁻², leading to a nonvolatile MIT behavior through the reversible electrical conductance with a large on/off ratio (≈10²), long retention time (≈10⁴ s), and high endurance (≈10³ cycles). Furthermore, the structural phase transition of VO₂ is corroborated by ferroelectric polarization through in situ Raman mapping analysis. This study provides novel design principles for heteroepitaxial correlated materials and innovative insight to modulate multifunctional properties.

更新日期：2022-06-17

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