CAREER: Charge Carrier Dynamics in Organic Semiconductors: from Macroscopic to Microscopic Level

该项目由材料研究部电子材料项目和化学部实验物理化学项目共同资助。技术：该项目旨在从宏观和微观层面研究有机半导体中的电荷载流子动力学，最终目标是开发在单分子光电器件中利用电荷转移过程的方法。负责导电性的分子间电荷转移机制将使用光电导技术的组合进行研究：时间分辨发光，单分子荧光显微镜，和电力显微镜。该项目是研究官能化聚并苯和蒽二噻吩。其目的是：（一）建立电荷光生、传输和捕获的机制，并模拟光电导性能;（二）在单分子水平上观察和表征电荷捕获和释放过程;（三）在微观尺度上测量电荷载流子迁移率及其对局部环境的依赖性;（四）根据电荷捕获特性设计单分子器件。该项目解决了具有高技术相关性的材料科学主题领域的基础研究问题，预计将提供对有机半导体的新的科学认识，有机半导体在薄膜晶体管，发光二极管，太阳能电池和激光器中具有潜在的应用。该项目的研究部分与旨在实现四个主要目标的教育部分相结合：㈠通过本科生和高中生参与研究小组活动，向他们提供学习和研究经验;（ii）在课程中引入研究背景，开发先进光学材料的新课程和基于网络的教程，说明有机光学材料的物理和应用;（iii）让市民大众接触现代科技;及（iv）吸引妇女投身物理学工作。

This CAREER award is co-funded by the Electronic Materials Program in the Division of Materials Research and the Experimental Physical Chemistry Program in the Chemistry Division.Technical: The project is to study charge carrier dynamics in organic semiconductors on the macroscopic and microscopic levels with the final goal of developing methodology for utilizing charge-transfer processes in single-molecule optoelectronic devices. Mechanisms of intermolecular charge transfer responsible for conductivity will be investigated using a combination of photoconductivity techniques: time-resolved luminescence, single-molecule fluorescence microscopy, and electric force microscopy. The project is to study functionalized polyacenes and anthradithiophenes. It aims (i) to establish mechanisms of charge photogeneration, transport and trapping and to model the photoconductive performance; (ii) to observe and characterize charge trapping and detrapping processes on the single molecule level; (iii) to measure charge carrier mobility on the microscopic scales and its dependence on local environment; and (iv) to design single-molecule devices based on charge trapping properties.Non-technical: The project addresses basic research issues in a topical area of materials science with high technological relevance, and is expected to provide new scientific understanding of organic semiconductors, which have potential applications in thin-film transistors, light emitting diodes, solar cells, and lasers. The research component of the project is integrated with the educational component that will aim to achieve four main goals: (i) to provide learning and research experience to undergraduate and high-school students through their involvement in the research group activities; (ii) to introduce research context in the curriculum, to develop a novel course in advanced optical materials and a web-based tutorial illustrating physics and applications of organic optical materials; (iii) to provide exposure to modern science and technology for general public; and (iv) to attract women to careers in physics.