Time-resolved EPR for probing ordering in conjugated polymers and primary processes of charge generation in organic electronic devices

时间分辨 EPR 用于探测共轭聚合物的有序性和有机电子器件中电荷产生的主要过程

• 批准号: 300369943
• 负责人: Privatdozent Dr. Till Biskup
• 金额: --
• 依托单位: Lehrstuhl für Physikalische Chemie und Didaktik der Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/300369943?language=en
• 关键词: Time; resolved; EPR; probing; ordering

Organic semiconductors are used in a large number of applications ranging from light-emitting diodes (OLEDs) and transistors (OFETs) to solar cells (OSCs). Their advantage over conventional inorganic semiconductors is the low-cost and nearly endless flexibility in tailoring the molecules used. Generation, separation, and transport of charges are crucial aspects that need further investigation to develop efficient organic electronics. Morphology of the involved polymers is one of the most crucial aspects for the efficiency of organic electronic devices due to the existing strong structure-function relationship. Electron paramagnetic resonance (EPR) spectroscopy is nearly ideally suited to investigate conjugated polymers used for organic electronics, as most of the light-induced states are paramagnetic and can therefore be detected.The focus of this project is on investigating morphology and ordering in conjugated polymers and light-induced primary processes in organic electronic devices by time-resolved EPR spectroscopy. The microscopic processes are correlated with both, the morphology of the polymers and the macroscopic device efficiency. Due to the strong structure-function relationship, it is crucially important to control the sample morphology. Only if it is comparable to that in organic electronic devices, spectroscopic results can be correlated to device characteristics.In a systematic approach, the materials used for organic electronics will be investigated spectroscopically - starting out with the building blocks and continuing via oligo- and polymers to the blends of donor and acceptors materials used in the actual devices. To correlate morphology, microscopic processes and macroscopic device efficiency, an EPR setup to investigate whole organic electronic devices (OFETs, OSCs) will be built. Analysis of spin-polarised EPR spectra will be facilitated by developing an easy-to-use framework of simulation programs covering the different scenarios.

有机半导体被用于从发光二极管（OLED）和晶体管（OFET）到太阳能电池（OSC）的大量应用中。与传统的无机半导体相比，它们的优势在于低成本和在定制所用分子方面几乎无限的灵活性。电荷的产生、分离和传输是开发高效有机电子学需要进一步研究的关键方面。由于有机聚合物的结构与功能之间存在着很强的关系，因此聚合物的形貌是影响有机电子器件性能的重要因素之一。电子顺磁共振（EPR）光谱是研究有机电子器件中共轭聚合物的理想方法，因为大部分光诱导态都是顺磁性的，因此可以被检测到。本项目的重点是利用时间分辨EPR光谱研究共轭聚合物的形态和有序性，以及有机电子器件中光诱导的初级过程。微观过程与聚合物的形态和宏观器件效率两者相关。由于强的结构-功能关系，控制样品的形态至关重要。只有当它与有机电子器件中的材料相当时，光谱结果才能与器件特性相关联。在一种系统的方法中，用于有机电子的材料将通过光谱进行研究-从构建块开始，通过寡聚物和聚合物继续到实际器件中使用的供体和受体材料的混合物。为了将形态学、微观过程和宏观器件效率相关联，将建立一个研究整个有机电子器件（OFFERS，OSC）的EPR装置。自旋极化EPR谱的分析将促进开发一个易于使用的框架，涵盖不同的情况下的模拟程序。