Probing exciton dynamics with time resolved x-ray spectroscopy

本研究的目的是进一步了解激子动力学的有机半导体使用时间分辨x射线光谱。待研究的材料将包括：聚噻吩、Y 6和Y 7，后两者是作为真实的世界光致发光材料的非常有前途的材料，这是由于所展示的高转换效率和激子的直接电荷分离以产生自由电荷而不需要在供体-受体异质结构中实现。该项目将进行必要的研究和开发高时间分辨率（< 10 fs）时间分辨X射线光谱仪。这将涉及优化的高次谐波产生源的研究围绕S L边缘，Cl L边缘和C和N Kedges在这些材料中，并在平行的可见近红外子飞秒泵浦脉冲的优化。将寻求XFEL（包括FLASH、瑞士自由电子激光、FERMI、LCLS和欧洲XFEL）的进一步束流时间，以扩展研究以捕获更高能量原子边缘（例如O K和FK边缘）的动态。

The goal of this research is to further the understanding of exciton dynamics in organic semiconductors using time-resolved x-ray spectroscopy. The materials to be studied will include: Polythiophene, Y6 and Y7 the latter two being very promising materials as real world photovoltaics due to demonstrated high conversion efficiency and direct charge separation of the exciton to generate free charges without the need to implement in a donor-acceptor heterostructure. The project will conduct necessary research and development of an apparatus for high time resolution (< 10 fs) time resolved x-ray spectroscopy. This will involve optimisation of a high harmonic generation source for studies around the S L edge, Cl L edge and C and N Kedges in these materials, and in parallel the optimisation of visible-near IR sub-fs pump pulses. Further beamtime at XFELs (including FLASH, Swiss FEL, FERMI, LCLS and European XFEL) will be sought in order to extend the studies to capture the dynamics at higher energy atomic edges e.g. O K and F K edges.