Local Vibrational Modes of Impurities in Semiconductors

该项目致力于GaN、ZnO、Si和CdTe等半导体的局部振动模式（LVM）光谱，以确定缺陷中心的结构及其与宿主环境的振动相互作用。 杂质，如氢，氧和DX中心将在这些技术上重要的材料进行研究。将使用静水压和红外（IR）和拉曼光谱法来探测此类杂质产生的LVM。 除了无机半导体之外，还将研究并五苯等有机半导体。 使用超快红外光谱的时间分辨实验将用于探测半导体中的振动寿命和共振相互作用。该项目解决了具有高度技术相关性的电子/光子材料科学主题领域的基础研究问题。 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。 拟议的教育活动将使从八年级到研究生院的一系列学生受益。 与研究相结合的教育计划包括与科尔维尔印第安保留地的一所公立学校的外展活动，对本科物理课程的改进，以及实验室和讲座演示的发展。 这些活动旨在鼓励来自不同背景的学生进入与材料科学和固态物理相关的领域。

This project addresses local vibrational mode (LVM) spectroscopy of semiconductors such as GaN, ZnO, Si, and CdTe in order to determine the structure of defect centers and their vibrational interactions with the host environment. Impurities such as hydrogen, oxygen, and DX centers will be studied in these technologically important materials. Hydrostatic pressure will be used, with infrared (IR) and Raman spectroscopy, to probe the LVMs arising from such impurities. In addition to inorganic semiconductors, organic semiconductors such as pentacene will also be investigated. Time-resolved experiments using ultrafast IR spectroscopy will be used to probe vibrational lifetimes and resonant interactions in semiconductors. The project addresses fundamental research issues in a topical area of electronic/photonic materials science having high technological relevance. An important feature of the project is the strong emphasis on education, and the integration of research and education. The proposed educational activities will benefit a range of students from the eighth grade to graduate school. Educational programs integrated with research include outreach activities with a public school on the Colville Indian reservation, improvements to undergraduate physics courses, and the development of laboratories and lecture demonstrations. These activities are pursued to encourage students from diverse backgrounds to enter fields related to materials science and solid-state physics.