POWRE: Femtosecond Far-infrared Studies of Carrier Dynamics in Disordered Systems

该项目旨在更好地理解无序电子材料中的载流子动力学。该研究将应用新技术，包括最近开发的在远红外（太赫兹频率范围）产生和检测飞秒脉冲的方法，以探测非晶硅和微晶硅以及相关材料中的载流子过程。实验的目的是解决这些材料的输运特性中未解决的问题，通过探测载流子动力学在一个以前未探索的能量尺度对应于本地化的状态附近的迁移率边缘。实验也计划调查的基本性质的两个层次的隧道状态在非晶材料。无序的电子特性的作用将解决在测量一系列的良好表征的样品，包括薄膜与控制度的顺序产生的热线辅助化学气相沉积技术。这是根据研究和教育领域女性专业机会（POWRE）方案提供的研究增强补助金。该研究将在与电子材料行为特别相关的基础层面上贡献基础材料科学知识。该项目还强调通过研究生和本科生参与研究，将研究与教育结合起来，并包括一个特别的夏季研究助理，以鼓励代表性不足的少数民族和女学生参与研究。该项目由材料研究部和MPS OMA（多学科活动办公室）共同支持。***

This project aims to achieve greater understanding of carrier dynamics in disordered electronic materials. The research will apply new techniques involving recently developed methods for the generation and detection of femtosecond pulses in the far-infrared (terahertz frequency range) to probe carrier processes in amorphous and microcrystalline silicon, and in related materials. Experiments are designed to address unresolved issues in the transport properties of these materials by probing the carrier dynamics on a previously unexplored energy scale corresponding to localized states near the mobility edge. Experiments are also planned to investigate the fundamental nature of two-level tunneling states in amorphous materials. The role of disorder in the electronic properties will be addressed in measurements on a series of well-characterized samples, including films with controlled degrees of order produced by the hot-wire-assisted chemical vapor deposition technique. %%% This is a research enhancement grant made under the Professional Opportunities for Women in Research and Education (POWRE) program. The research will contribute basic materials science knowledge at a fundamental level of special relevance to the behavior of electronic materials. The project also places emphasis on the integration of research and education through graduate and undergraduate student participation in research, and involves a special summer Research Assistantship to encourage participation of underrepresented minorities and women students in research. The project is co-supported by the Division of Materials Research, and the MPS OMA(Office of Multidisciplinary Activities). ***