Ming Wenjie, Huang Boyuan, Zheng Sizheng, Bai Yinxin, Wang Junling, Wang Jie, Li Jiangyu
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
School of Materials Science and Engineering, Hunan Provincial Key Laboratory of Thin Film Materials and Devices, Xiangtan University, Xiangtan, Hunan 411105, China.
Sci Adv. 2022 Aug 19;8(33):eabq1232. doi: 10.1126/sciadv.abq1232.
Van der Waals layered CuInPS (CIPS) is an ideal candidate for developing two-dimensional microelectronic heterostructures because of its room temperature ferroelectricity, although field-driven polarization reversal of CIPS is intimately coupled with ionic migration, often causing erratic and damaging switching that is highly undesirable for device applications. In this work, we develop an alternative switching mechanism for CIPS using flexoelectric effect, abandoning external electric fields altogether, and the method is motivated by strong correlation between polarization and topography variation of CIPS. Phase-field simulation identifies a critical radius of curvature around 5 μm for strain gradient to be effective, which is realized by engineered topographic surfaces using silver nanowires and optic grating upon which CIPS is transferred to. We also demonstrate mechanical modulation of CIPS on demand via strain gradient underneath a scanning probe, making it possible to engineer multiple polarization states of CIPS for device applications.
范德华层状CuInPS（CIPS）由于其室温铁电性，是开发二维微电子异质结构的理想候选材料，尽管CIPS的场驱动极化反转与离子迁移密切相关，这通常会导致不稳定且具有破坏性的开关行为，这对于器件应用来说是非常不可取的。在这项工作中，我们利用挠曲电效应为CIPS开发了一种替代的开关机制，完全摒弃了外部电场，该方法的灵感来源于CIPS的极化与形貌变化之间的强相关性。相场模拟确定了应变梯度有效的临界曲率半径约为5μm，这是通过使用银纳米线和光栅对CIPS进行转移的工程化形貌表面来实现的。我们还通过扫描探针下方的应变梯度按需展示了CIPS的机械调制，这使得为器件应用设计CIPS的多种极化状态成为可能。
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