CAREER: Semiconducting Delafossite Structures for Transparent Conducting Coating

这个CAREER项目系统地探索了阳离子取代的沉积岩结构的电学和光学性质。AgInO2的电学和光学性质可归因于其特有的延迟岩结构；它由二维的单价a原子（Cu, Ag， Pd或Pt）组成，夹在bh3 + O6八面体层之间。这些材料中线性协调的O-A-O结构是其传导机制的关键。该项目的实验目标是确定影响金属a原子之间轨道重叠和三维或四维态晶体场分裂的晶体化学关系。通过在A-和b -位点上的阳离子取代，可以控制拖地结构中A-A和O-A-O的距离。预计这些结构的变化将表现在可见光谱的电导率、迁移率、带隙和光透射率的变化上。研究主题将与K-12课堂相关，并与K-12科学教师合作。合作者将在夏季与研究小组一起工作，从而获得材料科学方面的实践经验。他或她将在下个学期在课堂上使用这些知识。此外，还将在当地一家寄宿机构为患有情绪和行为障碍的儿童开展暑期科学项目。将结合动手实验材料，一对一的指导，以及基于互联网的扫描电子显微镜（SEM）来吸引孩子们的注意力，激发他们对科学的兴趣。该项目涉及具有高技术相关性的材料科学主题领域的基础研究问题。该项目的范围将使学生接触到材料合成、加工和表征方面的挑战。该项目的一个重要特点是非常重视教育，并将研究与教育相结合。＊＊＊

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. ***