CAREER: Imaging Excitons, Spin Coupling and Magnetism in Discotic Crystalline Organic Semiconductors

*技术摘要*拟议的职业努力的首要目标将是了解具有长程有序的盘状晶体分子薄膜中激子、磁性、自旋交换机制和分子堆积之间的关联。这个项目将使用磁光光谱技术来深入了解有机半导体薄膜中电子态和自旋态之间的基本联系、长程有序和晶界的作用。重点领域包括：(I)多晶酞菁(Pc)薄膜晶界电子态的显微光致发光和线性二色性研究(Ii)光激发载流子跨晶界传输的显微研究(Iii)磁圆二色(MCD)和法拉第旋转研究Mn-、Fe-和Co-Pc晶体薄膜的结构和磁有序之间的相关性。教育和外展活动包括开发与研究相关的新课程，与佛蒙特州EPSCoR合作，为高中学生和教师建立“物理科学女性”(WIPS)导师计划和“物理摄影”计划。*非技术摘要*作为传统硅基技术替代品的有机电子学的研究在过去20年里取得了巨大的进步。虽然消费者在这一领域已经取得了一些最伟大的成就(即有机发光二极管)，但最近在小分子有机薄膜领域取得的显着进展吸引了更广泛的研究人员的注意，他们的兴趣范围从有机薄膜晶体管到磁性器件，甚至是快速光探测。这个项目的重点是了解有机分子的复杂系统，这些分子自组装成具有宏观有序和各向异性性质的结构，类似于液晶。拟议的实验将利用高磁场下的偏振光谱学成像，将小染料分子结晶薄膜的电子和磁性与分子有序性相关联。教育和外展活动包括开发与研究相关的新课程，与佛蒙特州EPSCoR合作，为高中学生和教师建立“物理科学女性”(WIPS)导师计划和“物理摄影”计划。

*** Technical Abstract *** The overarching goal of the proposed CAREER effort will be to understand the correlations between excitons, magnetic properties, spin exchange mechanisms and molecular stacking in discotic crystalline molecular thin films with long range order. This project will employ magneto-optical spectroscopy techniques to gain insight into the fundamental links between the electronic and spin states, long range order and the role of grain boundaries in thin films of organic semiconductors. Focus areas include: (i) Micro-photoluminescence and linear dichroism microscopy studies of electronic states at the grain boundaries of polycrystalline phthalocyanine (Pc) films (ii) Microscopy study of photo excited carriers transport across a single grain boundary (iii) Magnetic Circular Dichroism (MCD) and Faraday rotation studies of correlations between structural and magnetic ordering in Mn-, Fe-, and Co-Pc crystalline films. Educational and outreach activities include development of new research-related courses, a collaboration with Vermont EPSCOR to establish a "Women in Physical Sciences" (WIPS) mentorship program and a "Physics Photography" program for high school students and teachers. *** Non-Technical Abstract *** The search for organic electronics as alternatives to traditional silicon-based technologies has advanced tremendously over the past two decades. While some of the greatest achievements in this field already available to consumers (i. e. OLEDs) remarkable recent advances in the area of small-molecules organic thin films captured the attention of a significantly broader researcher base with interests ranging from organic thin film transistors to magnetic devices and even fast light detection. This project focuses on understanding complex systems of organic molecules that self-assemble into structures with macroscopic order and anisotropic properties similar to liquid crystals. The proposed experiments will correlate the electronic and magnetic properties of crystalline films of small dye molecules to molecular ordering using polarized light spectroscopy imaging in high magnetic fields. Educational and outreach activities include development of new research-related courses, a collaboration with Vermont EPSCOR to establish a "Women in Physical Sciences" (WIPS) mentorship program and a "Physics Photography" program for high school students and teachers.