Engineering Interfaces in No-Common-Atom Heterostructures

非共原子异质结构中的工程接口

• 批准号: 0412736
• 负责人: Roy Clarke
• 金额: $ 11.93万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0412736&HistoricalAwards=false
• 关键词: Engineering; Interfaces; No; Common; Atom

A one-year program of research is proposed on the synthesis and atomic level characterization of short period superlattices (SPS) in which the constituent layers do not share a common element. These no-common-atom systems, such as InAs/GaSb, have attracted significant interest for applications in infrared optoelectronics technology, offering the possibility to tune electronic band structure by manipulating the low-symmetry interface structure. The goal is to achieve understanding of the epitaxial growth conditions and processes required to synthesize no-common-atom SPS with well-defined interface structures. This calls for a high level of control over atomistic mechanisms of interface formation and the ability to characterize the interface structure with atomic resolution. A unique feature of the project is the use of a novel direct method to image buried interfaces using x-ray synchrotron radiation. This technique, Coherent Bragg Rod Analysis (COBRA), is capable of providing, non-destructively, a three-dimensional map of epitaxial thin-film structures with sub-Angstrom resolution of atomic positions. COBRA maps will be used to seek sufficiently detailed structural and compositional information to control growth conditions enabling specific interface structures with tailored optoelectronic properties. Theoretical predictions of the interface composition distributions are available with which experimentally determined interface structures can be compared. These kinetic models will serve as a useful guide for experiments. %%% The project addresses basic research issues in a topical area of electronic materials with high technological relevance. The tunability of electronic properties inherent in no-common-atom short period superlattices (SPS) systems may impact infrared device technology in areas where there are important societal needs, for example in health care, communications, and national security. An important element of the project is the integration of research and education through the training of students in a fundamental and technologically significant area. The project offers exciting research opportunities for graduate training and also for more junior students to become interested in science and engineering. A program of research activities which are integrated with the proposed research, but which are also accessible to less experienced students has been devised. The use of national research facilities (Advanced Photon Source) will expose students to forefront programs in materials research, and provide opportunities to network with a broad range of educational and training activities in different fields. The U. MI joint Beam Line Sector with Howard University at the Advanced Photon Source is a focal point for encouraging research participation of students from underrepresented groups. ***

提出了一项为期一年的研究计划，研究短周期超晶格（SPS）的合成和原子级表征，其中组成层不共享共同元素。这些非共原子系统，例如 InAs/GaSb，引起了人们对红外光电子技术应用的极大兴趣，提供了通过操纵低对称性界面结构来调节电子能带结构的可能性。目标是了解合成具有明确界面结构的非共原子 SPS 所需的外延生长条件和过程。这需要对界面形成的原子机制进行高水平的控制，并具有以原子分辨率表征界面结构的能力。该项目的一个独特之处是采用了一种新颖的直接方法，利用 X 射线同步加速器辐射对埋藏界面进行成像。这项技术称为相干布拉格棒分析 (COBRA)，能够非破坏性地提供具有亚埃级原子位置分辨率的外延薄膜结构的三维图。 COBRA 图谱将用于寻找足够详细的结构和成分信息，以控制生长条件，从而实现具有定制光电特性的特定界面结构。界面成分分布的理论预测是可用的，可以与实验确定的界面结构进行比较。这些动力学模型将为实验提供有用的指导。 %%% 该项目解决了具有高度技术相关性的电子材料主题领域的基础研究问题。非共原子短周期超晶格 (SPS) 系统固有的电子特性的可调性可能会影响具有重要社会需求领域的红外设备技术，例如医疗保健、通信和国家安全。该项目的一个重要组成部分是通过在基础和技术重要领域对学生进行培训来整合研究和教育。该项目为研究生培训以及更多初级学生对科学和工程产生兴趣提供了令人兴奋的研究机会。设计了一个研究活动计划，该计划与拟议的研究相结合，但经验不足的学生也可以参与。国家研究设施（高级光子源）的使用将使学生接触到材料研究的前沿项目，并提供与不同领域的广泛教育和培训活动建立联系的机会。密歇根大学与霍华德大学在先进光子源联合建立的光束线部门是鼓励来自代表性不足群体的学生参与研究的焦点。 ***