Laser joining and assembly of nanowires: processing, structure, properties and performance

纳米线的激光连接和组装：加工、结构、特性和性能

• 批准号: RGPIN-2018-03980
• 负责人: Zhou, Norman
• 金额: $ 5.54万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712307
• 关键词: Laser; joining; assembly; nanowires; processing

This proposed research program will study both fundamental and engineering issues in laser joining and assembly of nanowires, with combined experimental and numerical modeling methods. The goal is to, based on our previous work on laser joining of nanoparticles and nanowires, establish fundamental relationships between laser and other processing parameters, metallurgical characteristics of dissimilar joints of semiconductor nanowires and metal electrodes/substrates, interfacial structure, and electrical contact properties and performance of selected nanowire based electronic components and devices. There are three specific objectives, i.e., (1) to study relationships between processing parameters and joint formation in laser joining of nanowires, based on quantitative (or semi-quantitative) thermal history at interfacial regions; (2) to investigate the effect of laser processing parameters on interfacial structures, including crystallographic orientation relations at the interface, and electrical contact properties; and (3) to build prototype nanowire based electronic devices and explore their electrical performance as related to interfacial structure and electrical contact properties, and study the carrier transport mechanisms at the metal-semiconductor interfaces. The program will cover oxide semiconductor nanowires, such as TiO2, ZnO and CuO, and metal electrodes such as Au, Ag and Ti. Initial processing parameters will include laser fluences, pulse duration, spot size, etc. Advanced analytical equipment such as transmission electron microscopy and X-ray photoelectron emission microscopy will be used for detailed study of metallurgical defects and crystal orientation relations at interfaces, etc. Electrical properties such as contact resistance of Ohmic contacts and energy barrier height of Schottky contacts will be studied as functions of interfacial structures. Electrical performance of functional prototype components and devices such as field effect transistor and memristor will be investigated. The examples of numerical modeling include finite element analysis of thermal history and molecular dynamic simulation of interfacial structures. The successful execution of this program will not only provide valuable fundamental insights such as laser-nanowire interactions, but also develop know-how technologies in laser precision assembly of nanoscale devices. This program will also train 13 highly qualified personnel (HQP), including six doctoral and master's students, four undergraduate work-term students and three post-doctoral fellows with cutting edge knowledge and skills in the fields of materials science and engineering, laser processing and nanoscale device development. Canada's future competitiveness will also be enhanced through their future positions in Canadian academia, industries and research institutes.

该研究计划将结合实验和数值建模方法，研究纳米线激光连接和组装的基础和工程问题。我们的目标是，基于我们之前关于纳米颗粒和纳米线激光连接的工作，建立激光和其他加工参数、半导体纳米线和金属电极/基底异种接头的冶金特性、界面结构以及所选纳米线基电子元件和器件的电接触特性和性能之间的基本关系。 有三个具体目标，即（1）基于界面区域的定量（或半定量）热历史研究纳米线激光连接中的加工参数和接头形成之间的关系； （2）研究激光加工参数对界面结构的影响，包括界面的晶体取向关系和电接触性能； (3)构建基于纳米线的电子器件原型，探索其与界面结构和电接触特性相关的电性能，并研究金属-半导体界面的载流子传输机制。 该项目将涵盖氧化物半导体纳米线，如TiO2、ZnO和CuO，以及金属电极，如Au、Ag和Ti。初始加工参数将包括激光能量密度、脉冲持续时间、光斑尺寸等。先进的分析设备，如透射电子显微镜和X射线光电子发射显微镜，将用于详细研究冶金缺陷和界面晶体取向关系等。将研究欧姆接触的接触电阻和肖特基接触的能垒高度等电性能作为界面结构的函数。将研究功能原型组件和器件（例如场效应晶体管和忆阻器）的电气性能。数值模拟的例子包括热历史的有限元分析和界面结构的分子动力学模拟。 该项目的成功执行不仅将提供诸如激光-纳米线相互作用等有价值的基础见解，而且还将开发纳米级设备激光精密组装方面的专有技术。该项目还将培养13名在材料科学与工程、激光加工和纳米器件开发等领域具有前沿知识和技能的高素质人才（HQP），其中包括6名博士和硕士生、4名本科生和3名博士后。加拿大未来的竞争力也将通过他们在加拿大学术界、工业界和研究机构的未来地位得到增强。