Architectures and profiling of nanomaterials with ion beams

离子束纳米材料的结构和分析

• 批准号: RGPIN-2015-04029
• 负责人: Goncharova, Lyudmila
• 金额: $ 2.04万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=612730
• 关键词: Architectures; profiling; nanomaterials; ion; beams

The fundamental properties of matter change dramatically due to quantum effects in confined particles. This is the foundation of nanoscience and a cornerstone for the production of advanced materials and devices. The pursuit of these improved materials and devices strongly depends on existing and new methods of changing their architecture, composition and key properties at the atomic scale. In our group we focus on gaining insights into the atomic-scale behavior of complex materials and their interfaces. We employ advanced methods of nanomaterials growth, such as ion beam implantation and molecular beam epitaxy (MBE). We rely on surface and interface characterization with sub-nanometer depth resolution (such as medium energy ion scattering, MEIS), and the atomic lateral resolution to build our fundamental understanding of processes at the surfaces and interface. We use this knowledge as a foundation for understanding device performance. The proposed research program may be divided into two interconnected themes: Theme 1: Quantum semiconductor structures for broad–range wavelength optical devices. We will explore semiconductor quantum dots (QDs) made of ion-implanted Si and Ge in various dielectric materials (oxides, nitrides and carbides). The key objective is to explore the basic physical properties of these systems, such as the nucleation and growth of QDs, and radiative and non-radiative recombination of carriers using various spectroscopic tools. Special effort will be given to the theoretical modelling of interfaces, defect formation at the interfaces, and the description of the transport properties using established and new models. Understanding these issues and correlating the results to optical and electrical properties such as the photoluminescent yield and charge transport will greatly improve the basic understanding of light-emitting devices. Our group has had a transformative breakthrough growing horizontal epitaxial Si wires using MBE for enhanced photoconversion and broad-band solar cells. We will integrate our Si/Ge wires as efficient optoelectronic active materials. Theme 2: High resolution ion depth profiling. The objectives are to develop new methods of ion beam analysis, and to perform high-resolution profiling of ultra-thin films and nanoparticles with a focus on the interfaces and to develop a comprehensive model of interface structures for photonics and lithium battery materials. Ion beam methods will be applied in synergy with x-ray photoemission, absorption near edge structure and neutron depth profiling to examine the mechanism of diffusion in passive oxides on metals, and other systems, including in situ studies. My research program offers research in ion beam analysis that is unique in Canada. I will train future scientists in an instrument-intense and interdisciplinary research environment in technologically-significant areas.

物质的基本特性由于受限量的量子效应而发生巨大变化。这是纳米科学的基础，也是生产高级材料和设备的基石。对这些改进的材料和设备的追求很大程度上取决于在原子规模上改变其建筑，组成和关键特性的现有和新方法。在我们的小组中，我们专注于获得对复杂材料及其界面的原子级行为的见解。我们员工的纳米材料生长的高级方法，例如离子束植入和分子束外延（MBE）。我们依靠表面和界面表征，具有子纳米的深度分辨率（例如中能离子散射，MEI）和原子侧分辨率，以建立我们对表面和界面过程中过程的基本理解。我们将这些知识作为理解设备性能的基础。拟议的研究计划可以分为两个。互连主题： 主题1：宽范围波长光学设备的量子半导体结构。我们将在各种饮食材料（氧化物，氮化物和碳化物）中探索由离子植入的Si和GE制成的半导体量子点（QD）。关键目的是探索这些系统的基本物理特性，例如QD的成核和生长，以及使用各种光谱工具对载体进行辐射和非辐射重组。将对接口的理论建模，界面处的缺陷形成以及使用已建立和新模型对传输属性的描述进行特殊努力。了解这些问题并将结果纠正到光和电气特性（例如光致发射产量和电荷运输）将大大改善对发光设备的基本理解。我们的小组使用MBE具有增强的光转换和宽带太阳能电池的变革性突破性突破。我们将将SI/GE电线集成为有效的光电活动材料。 主题2：高分辨率离子深度分析。这些目标是开发新的离子光束分析方法，并对超薄膜和纳米颗粒进行高分辨率分析，重点关注界面，并开发用于光子和锂电池材料的界面结构的全面模型。离子光束方法将与X射线光发射，近边缘结构的抽象和中子深度分析相结合，以检查金属和其他系统（包括原位研究）的扩散机理。 我的研究计划提供了在加拿大独特的离子光束分析研究。我将在技术重要领域的仪器启发和跨学科研究环境中培训未来的科学家。