Agile electronics through ferroelectric switching of two-dimensional materials

通过二维材料的铁电开关实现敏捷电子学

• 批准号: 2569967
• 金额: --
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2569967
• 关键词: Agile; electronics; through; ferroelectric; switching

Atomically thin layers of different two-dimensional materials can be stacked with atomic precision to create 2D heterostructures (2D-HS). This has led to the design of more efficient light emitting diodes for example, and the study of new phenomena such as an insulating to superconducting transition in graphene. In these heterostructures, electric fields perpendicular to the layers can be used to engineer the band alignments, control carrier concentrations, and even switch between metallic, insulating and superconducting states. These fields are usually induced by predefined metallic electrodes which give control over the field strength but are of fixed (microscale) geometry and have limited dynamic response. This project will develop an alternative approach. Strong electric fields can be formed at the surface of thin-film ferroelectric perovskite oxides, with the field patterned with nanoscale precision. The polarity of the field can be switched rapidly and even the spatial arrangement of the field can be controlled dynamically. This presents an exciting opportunity to create agile electronics by integrating perovskite ferroelectrics into 2D-HSs. Creating such a robust platform for electrostatically defining insulating and conducting regions in 2DMs, and for dynamically switching their conductivity, will allow us to explore new physical phenomena and to develop new electronic functionalities. The aim of this project is to explore new artificial heterostructure systems that combine ultrathin ferroelectrics with 2DMs, especially 2D van-der-Waals semiconductors, exploiting reduced dimensionality and interfacial interactions to control the properties and engineer new functionalities in these artificial materials. The project will focus on developing techniques for controlling the interface between the 2D-HSs and high-quality thin-film perovskite oxides grown at Warwick by pulsed laser deposition. Careful characterisation of this interface, and its effect on the electronic properties of the 2D-HSs, will be essential to the wider success of the project. The research will make use of the excellent microscopy and spectroscopy infrastructure at the University of Warwick, as well as international synchrotron-based facilities. It is tied closely to the EPSRC funded responsive mode grant EP/T027207/1, Ferroelectric gating for agile and reconfigurable 2D electronics.

不同二维材料的原子薄层可以以原子精度堆积，以创建2D异质结构(2D-HS)。例如，这导致了更高效的发光二极管的设计，以及对新现象的研究，例如石墨烯的绝缘向超导转变。在这些异质结构中，垂直于层的电场可以用来设计能带排列，控制载流子浓度，甚至在金属、绝缘和超导状态之间切换。这些磁场通常是由预定义的金属电极引起的，这些电极可以控制场强，但具有固定的(微尺度)几何形状，具有有限的动态响应。该项目将开发一种替代方法。铁电钙钛矿氧化物薄膜表面可以形成很强的电场，这种电场可以形成纳米级的图案化。光场的极性可以快速切换，甚至可以动态控制光场的空间排列。这提供了一个令人兴奋的机会，通过将钙钛矿型铁电材料集成到2D-HSS中来创造灵活的电子产品。创建这样一个强大的平台来静电地定义2DM中的绝缘区和导电区，并动态地切换它们的导电性，将使我们能够探索新的物理现象和开发新的电子功能。这个项目的目的是探索将超薄铁电材料与二维半导体，特别是二维范德华半导体相结合的新的人工异质结构系统，利用降维和界面相互作用来控制这些人工材料的性质，并设计新的功能。该项目将专注于开发控制2D-HSS和通过脉冲激光沉积在沃里克生长的高质量薄膜钙钛矿氧化物之间的界面的技术。仔细描述这种界面及其对2D-HSS电子性质的影响，对于该项目的更广泛成功将是至关重要的。这项研究将利用华威大学卓越的显微镜和光谱学基础设施，以及基于同步加速器的国际设施。它与EPSRC资助的响应模式赠款EP/T027207/1密切相关，即用于灵活和可重新配置的2D电子的铁电门控。