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.

有机半导体用于大量应用，从发光二极管（OLEDS）和晶体管（OFET）到太阳能电池（OSC）。它们比常规无机半导体的优势是调整所使用的分子的低成本和几乎无尽的灵活性。电荷的产生，分离和运输是需要进一步研究以开发有效的有机电子产品的关键方面。由于现有的强结构功能关系，相关聚合物的形态是有机电子设备效率的最关键方面之一。电子顺磁共振（EPR）光谱概率几乎适合研究用于有机电子学的共轭聚合物，因为大多数光引起的状态都是顺磁性的，因此可以被检测到该项目的重点。该项目的重点是在结合聚合物和光诱导的构成型电子过程中研究形态学和序列。显微镜过程与聚合物的形态和宏观设备效率相关。由于结构功能强大的关系，控制样品形态至关重要。只有与有机电子设备相当的情况下，光谱结果才能与设备特性相关。为了使形态相关，显微镜过程和宏观设备效率，将建立一个EPR设置，以研究整个有机电子设备（OFET，OSCS）。通过开发涵盖不同场景的模拟程序的易于使用的框架，将促进自旋偏振EPR光谱的分析。