Development of tunnel field effect optoelectronic devices based on stacked 2D crystals with clean interfaces

基于具有干净界面的堆叠二维晶体的隧道场效应光电器件的开发

• 批准号: 1810453
• 负责人: Ming Liu
• 金额: $ 37.39万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1810453&HistoricalAwards=false
• 关键词: Development; tunnel; field; effect; optoelectronic

Nontechnical:Optical communication is based on converting electrical signals into optical signals by optoelectronic devices such as lasers and photodiodes. Devices based on conventional semiconductors such as silicon are reaching the ultimate limits for performance. New materials and structures are required to advance the state of the art. The discovery of graphene, a two-dimensional (2D) layer of carbon, shows how new electronic properties emerge when a bulk material is thinned down to a single layer. Other 2D materials include boron nitride, black phosphorous, and transition metal dichalcogenides. Different 2D materials can be assembled one layer at a time into vertically stacked thin films. Such heterostructures can achieve functions and performance not possible with a single material. The interface between different 2D materials is critical to maintaining the unique properties that make them attractive for device applications. The principal investigator will use a newly developed clean-transfer method to prepare 2D heterostructure materials with clean interfaces. A custom-built scanning probe microscope with nanometer-scale light sources at the tip will be used to study the optical and electronic properties of devices with unprecedented resolution. Results from this project will enrich the understanding of these materials and accelerate the development of nanoscale optoelectronics. This interdisciplinary project will integrate research into education of graduate and undergraduate students in material science, engineering, and nanomanufacturing. This project will also seek to broaden participation in science, technology, engineering and mathematics.Technical:This proposal will combine novel 2D-heterostructure material preparation techniques, near-field scanning optics microscopy and near-field scanning photocurrent microscopy to investigate the fundamental optoelectronic properties and photocarrier behaviors in van der Waals material-based heterostructures. The photocurrent imaging with high spatial resolution, below 10nm, can reveal rich physics in nanoscale features. These include local pn-junctions, domain boundaries, edges, dopants, and strains. Imaging such features can significantly improve the understanding and enhance the control of the electronic and photonic properties of this new material system. The objectives of this project are to: (1) demonstrate a prototype tapping-mode near-field scanning photocurrent microscopy to investigate heterostructure devices, (2) improve the spatial resolution of scanning photocurrent imaging technique to sub-10nm level, and (3) study the photoresponsivity of vertically-stacked heterostructures based on graphene, boron nitrides, transmission metal dichalcogenides such as WSe2, MoS2, and MoSe2, and (4) develop fundamental understanding of the roles of nanoscale features, such as edge terminations and interlayer defect formation on the optoelectronic properties.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术：光通信是基于通过激光器、光电二极管等光电器件将电信号转换为光信号。基于硅等传统半导体的器件正在达到性能的极限。需要新的材料和结构来推进最先进的技术。石墨烯是一种二维 (2D) 碳层，它的发现表明，当大块材料减薄至单层时，如何出现新的电子特性。其他二维材料包括氮化硼、黑磷和过渡金属二硫属化物。不同的二维材料可以一次一层地组装成垂直堆叠的薄膜。这种异质结构可以实现单一材料无法实现的功能和性能。不同二维材料之间的界面对于保持独特的性能至关重要，从而使它们对设备应用具有吸引力。首席研究员将使用新开发的清洁转移方法来制备具有清洁界面的二维异质结构材料。尖端带有纳米级光源的定制扫描探针显微镜将用于以前所未有的分辨率研究器件的光学和电子特性。 该项目的结果将丰富对这些材料的理解并加速纳米级光电子学的发展。这个跨学科项目将把研究整合到材料科学、工程和纳米制造领域研究生和本科生的教育中。该项目还将寻求扩大对科学、技术、工程和数学的参与。技术：该提案将结合新型二维异质结构材料制备技术、近场扫描光学显微镜和近场扫描光电流显微镜来研究基本光电特性以及基于范德华材料的异质结构中的光载流子行为。 10nm以下的高空间分辨率光电流成像可以揭示纳米尺度特征中丰富的物理现象。这些包括局部 pn 结、域边界、边缘、掺杂剂和应变。对这些特征进行成像可以显着提高对这种新材料系统的电子和光子特性的理解并增强对其的控制。该项目的目标是：(1) 展示用于研究异质结构器件的轻敲模式近场扫描光电流显微镜原型，(2) 将扫描光电流成像技术的空间分辨率提高到亚 10 纳米水平，以及 (3)研究基于石墨烯、氮化硼、传输金属二硫属化物（例如 WSe2、MoS2 和 MoSe2）的垂直堆叠异质结构的光响应性，以及 (4) 对纳米级特征的作用有基本的了解，该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Recent advances in tip-enhanced Raman spectroscopy probe designs

• DOI: 10.1007/s12274-022-5220-7
• 发表时间: 2022-12-27
• 期刊: NANO RESEARCH
• 影响因子: 9.9
• 作者: Xu，Da;Liang，Boqun;Liu，Ming
• 通讯作者: Liu，Ming

High external-efficiency nanofocusing for lens-free near-field optical nanoscopy

• DOI: 10.1038/s41566-019-0456-9
• 发表时间: 2019-09-01
• 期刊: NATURE PHOTONICS
• 影响因子: 35
• 作者: Kim, Sanggon;Yu, Ning;Yan, Ruoxue
• 通讯作者: Yan, Ruoxue

Physics-Guided Neural-Network-Based Inverse Design of a Photonic – Plasmonic Nanodevice for Superfocusing

用于超聚焦的光子-等离子体纳米器件的物理引导基于神经网络的逆向设计

• DOI: 10.1021/acsami.2c05083
• 发表时间: 2022
• 期刊: ACS Applied Materials & Interfaces
• 影响因子: 9.5
• 作者: Liang, Boqun;Xu, Da;Yu, Ning;Xu, Yaodong;Ma, Xuezhi;Liu, Qiushi;Asif, M. Salman;Yan, Ruoxue;Liu, Ming
• 通讯作者: Liu, Ming