CAREER: Semiconducting Delafossite Structures for Transparent Conducting Coating

职业：用于透明导电涂层的半导体铜铁矿结构

• 批准号: 0093616
• 负责人: David Cann
• 金额: $ 44.04万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0093616&HistoricalAwards=false
• 关键词: CAREER; Semiconducting; Delafossite; Structures; Transparent

This CAREER project systematically explores the electrical and optical properties of cation-substituted delafossite structures. The electrical and optical properties of AgInO2 can be attributed to certain unique features of the delafossite structure; it consists of a two-dimensional array of monovalent A-atoms (Cu, Ag, Pd, or Pt) sandwiched between layers of B 3+ O6 octahedra. It is the linearly coordinated O-A-O structure in these materials that is the key to their conduction mechanism. The experimental objective of this project is to determine crystal chemical relationships that influence orbital overlap between metallic A-atoms and the crystal field splitting of 3d or 4d states. With cationic substitutions on the A- and B-sites, it may be possible to manipulate the A-A and O-A-O distances in the delafossite structure. It is expected that these modifications to the structure will be manifested in variations in the conductivity, mobility, band gap, and optical transmission in the visible spectrum. The research themes will be related to the K-12 classroom with the help of a collaborating K-12 science teacher. The collaborator will work with the research group during the summer, thereby, receiving practical experience in materials science. He or she will use this knowledge in the classroom in the following school semester. In addition, a summer science program will be initiated at a local residential facility for children with emotional and behavioral disorders. A combination of hands-on experiments with materials, one-on-one instruction, and an internet-based scanning electron microscope (SEM) will be used to capture the children's attention and stimulate their interest in science.%%% The project addresses fundamental research issues in a topical area of materials science having high technological relevance. The scope of the project will expose students to challenges in materials synthesis, processing, and characterization. An important feature of the project is the strong emphasis on education, and the integration of research and education. ***

这个职业项目系统地探索了阳离子取代的氟磷矿结构的电学和光学性质。AgInO2的电学和光学性质可归因于氟硫铝石结构的某些独特特征；它由夹在B3+O6八面体之间的单价A原子(铜、银、钯或铂)的二维阵列组成。正是这些材料中线性配位的O-A-O结构是它们导电机制的关键。这个项目的实验目标是确定影响金属A原子之间的轨道重叠和3d或4d态的晶场分裂的晶体化学关系。通过A-和B-位上的阳离子取代，有可能操纵氟磷矿结构中的A-A和O-A-O距离。预计这些对结构的修改将表现为可见光光谱中的导电性、迁移率、带隙和光学透过率的变化。研究主题将与K-12课堂有关，并由一名合作的K-12科学教师帮助。合作者将在夏季与研究小组合作，从而获得材料科学方面的实践经验。他或她将在接下来的学期里在课堂上使用这些知识。此外，还将在当地一家为患有情绪和行为障碍的儿童提供住宿的设施启动一项暑期科学计划。将使用材料实验、一对一指导和基于互联网的扫描电子显微镜(SEM)相结合的方式来吸引孩子们的注意力，激发他们对科学的兴趣。该项目致力于解决材料科学中具有高度技术相关性的主题领域的基础研究问题。该项目的范围将使学生在材料合成、加工和表征方面面临挑战。该项目的一个重要特点是高度重视教育，并将研究与教育相结合。***