Vibrational Spectroscopy of Defects in Zinc Oxide

技术：该项目解决了与ZnO的p型掺杂相关的基本材料科学问题。该方法是评估补偿缺陷的作用，并探索新的方案引入受体掺杂剂。项目目标包括：确定ZnO中氢相关复合物的微观结构;研究和设计ZnO p型掺杂的新途径;并评估ZnO中氢的动力学和振动动力学。氢供体和受体-氢复合物将使用振动光谱结合电学测量进行研究。为了探测杂质的振动动力学、动力学和微观结构，将使用红外（IR）和拉曼光谱来测量ZnO中杂质的局域振动模式（LVMs）。流体静压将被用作实验变量，以获得有关氢相关复合物的结构以及LVMs和晶格声子之间的振动相互作用的信息。非技术性：该项目涉及材料科学领域的基础研究问题，具有高技术相关性，预计将为学生培训提供独特的机会。计划中的教育活动将使从小学（K-12）到研究生的一系列学生受益。相关的努力包括社区外展计划，以当地学校和家庭教育的儿童，讲座演示固态物理课程的发展，和本科生的研究机会。与研究相结合，这些活动预计将鼓励来自不同背景的学生进入与材料科学和固体物理学相关的领域。研究生和本科生将有机会进行前沿研究，并在毕业后，为科学和工程做出重大贡献。

Technical: This project addresses fundamental materials science issues related to p-type doping of ZnO. The approach is to assess the role of compensating defects, and to explore novel schemes for introducing acceptor dopants. Project objectives include: determine the microscopic structure of hydrogen-related complexes in ZnO; investigate and devise novel routes to p-type doping of ZnO; and to evaluate the kinetics and vibrational dynamics of hydrogen in ZnO. Hydrogen donors and acceptor-hydrogen complexes will be studied using vibrational spectroscopy in conjunction with electrical measurements. To probe vibrational dynamics, kinetics, and microscopic structure of impurities, infrared (IR) and Raman spectroscopy will be used to measure local vibrational modes (LVMs) of impurities in ZnO. Hydrostatic pressure will be used as an experimental variable to gain information about the structure of hydrogen-related complexes as well as vibrational interactions between LVMs and lattice phonons.Non-technical: The project addresses basic research issues in a topical area of materials science with high technological relevance, and is expected to provide unique opportunities for student training. Planned educational activities will benefit a range of students from elementary (K-12) to graduate students. Related efforts include community outreach programs to local schools and home schooled children, the development of lecture demonstrations for solid-state physics courses, and undergraduate research opportunities. In conjunction with research, these activities are expected to encourage students from diverse backgrounds to enter fields related to materials science and solid-state physics. Graduate and undergraduate students will have an opportunity to perform forefront research and, upon graduation, make significant contributions to science and engineering.