CAREER: Understanding polar surfaces and interfaces using ultra-high resolution electron microscopy and spectroscopy

非技术描述：该职业奖支持综合研究和教育工作，促进对下一代电子产品所必需的材料界面的理解。某些不同材料之间的界面的形成导致独特的性质，从而导致新的电子器件功能。这些界面上原子的详细排列和键合与观察到的行为密切相关。电子显微镜的最新进展使这些安排的调查在一个令人难以置信的水平。该项目采用这些最先进的电子显微镜方法直接研究界面结构和键合，为这些现象提供新的视角，为验证理论模型提供输入。 为了激发学生对科学和工程的热情，该项目与各种有针对性的教育计划相结合。本科生通过构建计算机程序直接为该项目做出贡献，这些程序有助于显微镜教育的新方法。 此外，由于传统的方法，使新的学生进入科学只有部分成功，教育推广计划的核心通过显微镜与视觉艺术相结合，刺激对科学的兴趣。为了在年轻学生和公众中产生最广泛的影响，该展览通过与当地博物馆和NSF纳米信息科学教育网络的联系进行分发。该项目旨在通过表征技术的进步，提高美国在电瓷领域的创新和经济竞争力。技术专长：该职业奖旨在解决不同极性材料及其表面之间界面的结构和电子重建的基本性质。特别是，岩盐氧化物与纤锌矿氮化物相结合，探索在异质极性界面的电荷补偿机制的细节。应变和缺陷的影响，在界面上的电子和原子结构的检查与国家的最先进的电子显微镜工具。 此外，原位电子显微镜用于研究岩盐氧化物的稳定性和结构，以提供与这类材料的生长、整合和控制相关的关键输入。与此同时，电子显微镜的能力正在发展，以充分提取详细的原子/电子结构和化学在极性界面。结果还指导和验证从头计算的建模，导致对独特行为的转变性理解。更广泛的影响和教育推广是这一努力的组成部分。在研究生水平的学生成为熟练的专家超高分辨率电子显微镜和光谱使用国家的最先进的仪器。本科生通过一个编程项目参与开发一个“数字”显微镜，以改变像差校正时代的显微镜教育。 与当地博物馆和学校合作，展览通过艺术的通用媒介传达先进的电子显微镜和材料科学研究，突出原子结构对称性的内在美。

NON-TECHNICAL DESCRIPTION: This CAREER award supports an integrated research and education effort that advances the understanding of material interfaces essential to enable next generation electronics. Formation of interfaces between certain dissimilar materials results in unique properties that lead to new electronic device functionality. The detailed arrangement and bonding of atoms at these interfaces is intimately linked to the observed behavior. Recent advancements in electron microscopy have enabled the investigation of these arrangements at an incredible level. This project employs these state-of-the-art electron microscopy methods to directly study the interface structure and bonding to offer a fresh perspective on these phenomena, providing input to validate theoretical models. To drive student passion in science and engineering, the project is coupled to a variety of targeted educational programs. Undergraduate students directly contribute to the project by building computer programs that facilitate new approaches to microscopy education. Moreover, because traditional approaches to bring new students into science have only been partially successful, the centerpiece of the educational outreach program stimulates interest in science through the combination of microscopy with the visual arts. For the broadest impact among young students and the general public, this exhibit is distributed through connections with a local museum and the NSF Nanoscale Informational Science Education network. This project stands to increase the U.S. innovation and economic competitiveness in the area of electroceramics and through advances in characterization techniques.TECHNICAL DETAILS: This CAREER award addresses the fundamental nature of structural and electronic reconstructions at the interface between distinctly different polar materials and their surfaces. In particular, rock salt oxides are combined with wurtzite nitrides to explore the details of charge compensation mechanisms at heterogeneous polar interfaces. The influence of strain and defects on the electronic and atomic structure at the interface is examined with state-of-the-art electron microscopy tools. Moreover, in situ electron microscopy is used to study the stability and structure of the rock salt oxides to provide critical input relevant to growth, integration, and control of this class of materials. Simultaneously, electron microscopy capabilities are being developed to fully extract the detailed atomic/electronic structure and chemistry at the polar interfaces. The results also guide and validate modeling from ab-initio calculations that lead to transformational understanding of unique behaviors. Broader impacts and educational outreach are integral to this effort. Students at the graduate level become skilled experts of ultra-high resolution electron microscopy and spectroscopy using state-of-the-art instrumentation. Undergraduate students participate through a programming project to develop a 'digital' microscope to transform microscopy education in the age of aberration correction. Working with local museums and schools, an exhibit communicates advanced electron microscopy and materials science research through the universal medium of art, highlighting the inherent beauty of atomic structure symmetries.