Design, Synthesis, and Properties of Open-Shell Organic Semiconductors

埃默里大学的Eilaf Egap教授得到了化学系大分子，超分子和纳米化学（MSN）计划的支持，以制定制备和研究开壳共轭低聚物和聚合物的策略。 研究了这些材料的化学和物理化学性质以及它们与光相互作用的方式。 我们的目标是了解并能够操纵影响其有机半导体特性的因素。有机半导体用于一系列技术中，例如发光二极管、传感器、光致发光器件和集成电子电路。该研究项目的结果预计将通过降低功耗，提高灵敏度以及增强数据和能量存储来直接影响这些技术。 在实施这一项目期间，代表性不足的少数民族学生和当地历史上的黑人学院和大学的本科生参与了与这一项目有关的科学研究活动。这是通过为期八周的夏季研究和指导计划以及物理和材料化学领域的联合研讨会系列来实现的。 学生们积极参与研究和计划系列研讨会，以保持他们对STEM领域的兴趣并充分参与其中。该研究计划推进了基于聚噻吩和醌骨架的有机开壳共轭低聚和聚合半导体材料的合成和表征策略，并包括稳定的长寿命自由基作为自旋资源。 这些材料的化学和物理性质，包括分子堆积和电子自旋的动力学和动力学，进行了研究。 这些材料的特点是使用各种技术，包括超快瞬态光谱和扫描探针显微镜。 本项目的一个重要目标是了解控制光诱导自旋排列和自旋极化的结构和物理因素，并确定影响有机低聚物/聚合物半导体中杂化状态和自旋交换的分子堆积，结构取向和拓扑因素。另一个目标是理解和建立设计规则，用于调制和预测激发态能级。理论计算和计算建模用于帮助指导目标的选择，并支持自旋极化和激发态的研究。

Professor Eilaf Egap of Emory University is supported by the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program in the Division of Chemistry to develop strategies for the preparation and investigation of open-shell conjugated oligomers and polymers. The chemical and physiochemical properties of these materials and the way they respond upon interactions with light are investigated. The goal is to understand and be able to manipulate the factors that influence their organic semiconducting properties. Organic semiconductors are used in a range of technologies such as light-emitting diodes, sensors, photovoltaics and integrated electronic circuits. The results of this research project are expected to directly impact these technologies by reducing power consumption, improving sensitivity, and enhancing data and energy storage. During the course of conducting this project, students from underrepresented minorities and undergraduate students from local historically-black colleges and universities are involved in science research activities related to this project. This is accomplished through an eight-week summer research and mentoring program and a joint seminar series in the areas of physical and materials chemistry. The students are actively involved in research and in planning the seminar series as a motivation to keep them interested and fully engaged in STEM areas.This research program advances strategies for the synthesis and characterization of organic open-shell conjugated oligomeric and polymeric semiconductor materials based on polythiophene and quinoidal backbones, and including stable long-lived radicals as spin resources. The chemical and photophysical properties of these materials, including molecular packing and the dynamics and kinetics of electron spins, are investigated. The materials are characterized using a variety of techniques, including ultrafast transient spectroscopy and scanning probe microscopy. An important goal of this project is to understand the structural and physical factors that control photo-induced spin-alignment and spin-polarization and to determine the molecular packing, structural orientation and topology factors which influence hybrid states and spin-exchange in organic oligomer/polymer semiconductors. Another goal is to understand and establish design rules for modulating and predicting excited-states energy levels. Theoretical calculations and computational modelling are used to help guide the choice of targets and to support the spin polarization and the excited states studies.