Carrier Dynamics and Charge Transport in Novel Electronic Materials

* 非技术性摘要 * 电子的电荷输运是凝聚态物理中最基本和最核心的课题之一。 从技术的角度来看，电子和光电子工业依赖于对电荷传输的详细理解和相关的控制能力。然而，传统的电导率测量仅限于相对较低的频率和可以产生令人满意的电接触的样品。 这个个人研究者奖支持一个项目，以追求实验，解决以前棘手的问题，有关有机光导材料和纳米级材料中的电荷传输和载流子动力学。 使用基于能够提供非常快的光脉冲的激光器（即飞秒脉冲激光器）的能力的实验方法，将在不需要电接触的情况下测量材料的高频电导率。 这些科学成果不仅对凝聚态和材料物理学科具有重要意义，而且有可能影响有机电子和光电器件以及太阳能电池等几项重要技术。 该项目将支持博士教育。学生.涉及凝聚态物理学基本问题的基础研究与实验研究中的实际问题相结合，为从学术界到高科技的职业道路提供了理想的培训基地。技术摘要 * 该个人研究者奖支持一个项目，使用太赫兹时域光谱的超快光学方法研究新型电子材料阵列中的电子电荷传输和载流子动力学。 随着新功能的开发，该技术将允许敏感的测量材料的复杂导电性高达中红外频率，而不需要接触和飞秒时间分辨率。该研究计划将解决有机光电导体的电荷传输特性和半导体纳米晶体中的载流子倍增问题。该项目将支持博士教育。学生.涉及凝聚态物理学基本问题的基础研究与光学和激光的实际问题相结合，为从学术界到工业界的职业道路提供了理想的培训基地。

****NON-TECHNICAL ABSTRACT****Electronic charge transport is one of the most fundamental and central subjects in condensed matter physics. From a technological standpoint, the electronics and optoelectronics industries depend on a detailed understanding of, and the associated ability to control, charge transport. Conventional conductivity measurements, however, are limited to relatively low frequencies and samples for which satisfactory electrical contacts can be produced. This individual investigator award supports a project to pursue experiments that address previously intractable problems concerning charge transport and carrier dynamics in organic photoconducting materials and in nanometer-scaled materials. Using an experimental approach based on the capabilities of lasers that are able to provide very fast pulses of light (i.e. femtosecond pulsed lasers), measurements of the high-frequency conductivity of the materials will be made, without the need for electrical contacts. The scientific results will be of significance not only to the disciplines of condensed-matter and materials physics, but also have the potential to impact several important technologies such as organic electronic and optoelectronic devices and solar cells. This project will support the education of a Ph.D. student. The combination of basic research involving fundamental issues in condensed matter physics with practical issues in experimental research provides an ideal training ground for career paths from academia to high technology.****TECHNICAL ABSTRACT****This individual investigator award supports a project to investigate electronic charge transport and carrier dynamics in an array of novel electronic materials using the ultrafast optical method of terahertz time-domain spectroscopy. With the new capabilities to be developed, the technique will permit sensitive measurements of the complex conductivity of materials up to the mid-infrared frequencies without the need of contacts and with femtosecond time resolution. The research program will address problems in charge transport properties of organic photoconductors and carrier multiplication in semiconductor nanocrystals. This project will support the education of a Ph.D. student. The combination of basic research involving fundamental issues in condensed matter physics with practical issues in optics and lasers provides an ideal training ground for career paths from academia to industry.