Optical Properties of Organic Semiconductors for Device Applications

技术说明本项目研究的是一组有机半导体的高质量单晶的基本光学性质--寡烯及其衍生物(包括Rubrene)。这些材料是用于器件应用的密集开发的主题，但到目前为止，大多数测量都是在薄膜器件上进行的，在薄膜器件中，半导体的固有属性已经通过薄膜沉积和器件加工得到了实质性的改变。这种方法是利用拉曼散射、光致发光和在不同温度、压力和激发能下的光吸收来测量低茂碳单晶和相关材料的光学性质，以及它们对环数和分子间距等特征的依赖关系。此外，计算模型将被用来帮助评估观察到的性质的来源，并预测相关化合物的性质。这两项努力(实验和理论)的结合有望使人们更好地理解这些材料的固有光学和电子性质与其分子和晶体结构的关系。该项目是与朗讯技术公司的克里斯蒂安·科洛克合作的。Kloc博士和他的同事正在积极开发用于电子设备应用的有机材料，并正在生长各种晶体，这些晶体的特性(例如迁移性)使其成为此类应用的潜在候选者。非技术解释该项目致力于与电子和光子学具有强烈技术相关性的基础材料研究，并有效地将研究和教育结合在一起。该项目的影响包括对下一代科学家的教育，并积极强调扩大代表性不足群体的参与。参与该项目的学生不仅将培养表征和光谱学方面的高级技能，而且(通过与Kloc博士在晶体生长方面的直接合作)还将对材料制造有更深的了解，帮助他们在完成学位后为在当今领先的工业研发机构的跨学科环境中做出重大贡献做好准备。通过北卡罗来纳大学-CH分校的暑期研究生前研究体验计划，国际学生联合会将把代表人数较少的少数族裔的学生带到她的实验室参与研究活动，并获得一些同样的好处。

TECHNICAL EXPLANATION This project addresses fundamental optical properties of high quality single crystals of a group of organic semiconductors-oligoacenes and their derivatives (including rubrene). These materials are the subject of intense development for use in device applications, but most measurements to date have been on thin-film devices in which intrinsic properties of the semiconductor have been substantially modified by film deposition and device processing. The approach is to use Raman scattering, photoluminescence, and optical absorption at varying temperature, pressure, and excitation energy to measure the optical properties of single crystals of oligoacenes and related materials, and their dependence on characteristics such as number of rings and intermolecular spacing. Additionally, computational modeling will be used to help assess the origin of observed properties, and to predict properties of related compounds. The combination of these two efforts (experimental and theoretical) is expected to lead to greater understanding of the relationship of intrinsic optical and electronic properties of these materials to their molecular and crystal structure. The project is collaborative with Christian Kloc of Lucent Technologies. Dr. Kloc and his co-workers are engaged in an active program of development of organic materials for electronic device applications, and are growing a wide variety of crystals whose properties (e.g. mobility) make them potential candidates for such applications.NON-TECHNICAL EXPLANATIONThe project addresses fundamental materials research with strong technological relevance to electronics and photonics, and effectively integrates research and education. The impact of the project includes education of the next generation of scientists with active PI emphasis on broadening participation of underrepresented groups. The students who participate in this project will develop not only advanced skills in characterization and spectroscopy, but also (through their direct collaboration with Dr. Kloc in the crystal growth) a deeper understanding of materials fabrication, helping them to be well prepared upon completion of their degrees to make significant contributions in the interdisciplinary environment found in today's leading industrial research and development facilities. Through the Summer Pre-Graduate Research Experience program at UNC-CH, the PI will bring students from underrepresented minorities into her laboratory to participate in the research activities and gain some of these same benefits.