Surface Acoustic Wave Spectroscopy Offers Novel, Broadband, and Spatially-Resolved Insight into Transition Metal Dichalcogenides Films

表面声波光谱为过渡金属二硫化物薄膜提供了新颖、宽带和空间分辨的见解

• 批准号: 388433893
• 负责人: Professor Dr. Hubert Johannes Krenner
• 金额: --
• 依托单位: Department of Chemistry
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/388433893?language=en
• 关键词: Surface; Acoustic; Wave; Spectroscopy; Offers

This bi-national German-US project is focused on studying the electrical transport properties of two-dimensional (2D) transition metal dichalcogenides by applying surface acoustic wave spectroscopy. This method is contactless and provides insight into the transport properties modulations in absence of any perturbation caused by electrical contacts crucially needed for alternative methods. The approach utilizes surface acoustic waves generated and recorded by means of interdigital transducers that are spaced millimeters away from the films under investigation. The films studied in this project are grown using a fully scalable approach, chemical vapor deposition, on technologically mature and emerging functional substrates for hybrid device architectures. Optical excitation is used to modify the transport properties of the films at diffraction-limited spatial resolution rivaling that of current photoluminescence and Raman maps. This allows new insight into the spatial variation of transport properties in transition metal dichalcogenide films. The German-US research team explores the impact of composition gradients in alloys of transition metal dichalcogenides, grain boundaries, lateral interfaces, and other material perturbations on the local conductivity. It aims to unravel the fundamental electrical transport properties of these in the technologically extremely important radio frequency domain (100 MHz up to 3 GHz) of next-generation advanced transition metal dichalcogenide heterostructures, from single flakes to substrate-scale continuous films. Emphasis will be set on the practical application of large-area films. These will be applied as the active detection medium of a surface acoustic wave-interrogated camera. A composition-graded film advances this device towards a spectrometer. Both devices are fully compatible with existing surface acoustic wave technology and can be interfaced and addressed via RF-ID tagged wireless communication. The project combines the expertise on acousto-optic and acousto-electric spectroscopy and control of optically active nanosystems using surface acoustic waves at Universität Augsburg and preparative techniques available at the University of California, Riverside. The research is expected to enhance the understanding of carrier transport in transition metal dichalcogenide films with defects, heterojunctions or other local variations. The acquired knowledge is a foundation for design of novel devices that incorporate heterojunctions of such films as functional elements.

该双国德国US项目的重点是研究通过施加表面声波光谱法研究二维（2D）过渡金属二核苷的电气传输性能。此方法是无接触式的，并在没有完全需要的替代方法所需的电触点引起的任何扰动的情况下提供了对传输属性调制的见解。该方法利用了通过距离研究的薄膜远离毫米远离毫米的跨换能器产生和记录的表面声波。该项目中的薄膜使用完全可扩展的方法，化学蒸气沉积，在技术成熟和新兴的功能底物上用于混合设备体系结构。光学兴奋用于以衍射有限的空间分辨率的风险来修改膜的传输特性，即当前光子性和拉曼图的传输风险。这允许对过渡金属二分法膜中传输特性的空间变化的新见解。德国美国研究小组探索了合金梯度在过渡金属二分法，晶界，横向界面和其他物质扰动对局部电导率的影响。它的目的是在从单片到底物尺度的连续膜中揭示它们在技术极为重要的射频频域（100 MHz最高3 GHz）中的基本电运输特性。重点将放在大面积电影的实际应用上。这些将被用作表面声波插座相机的主动检测介质。组成级的膜将该设备朝光谱仪推进。这两种设备都与现有的表面声波技术完全兼容，并且可以通过RF-ID标记的无线通信进行连接和解决。该项目结合了声音和声学 - 电语光谱的专业知识，并使用在奥格斯堡大学的表面声波对光学活性纳米系统的控制，并在加利福尼亚大学河滨分校提供了准备的技术。预计该研究将增强对过渡金属二甲元化膜中载体转运的理解，并具有缺陷，异缘或其他局部变化。获取的知识是设计新设备的设计基础，这些设备结合了功能元素等薄膜的异质界面。