Probing exciton dynamics with time resolved x-ray spectroscopy

利用时间分辨 X 射线光谱探测激子动力学

• 批准号: 2892743
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2892743
• 关键词: Probing; exciton; dynamics; time; resolved

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.

这项研究的目的是通过时间分辨X射线光谱法进一步了解有机半导体中的激子动力学。要研究的材料将包括：聚噻吩，Y6和Y7后两者是非常有前途的材料，作为现实世界光伏的材料，由于表现出较高的转化效率和激子的直接电荷分离，以产生自由电荷而无需在供体 - acceptor-Acceptor异质结构中实施。该项目将进行高时间分辨率（<10 fs）时间解决的X射线光谱的必要研究和开发。这将涉及优化这些材料中S L边缘，Cl L边缘以及C和N Kedges周围研究的高谐波生成源，并同时优化可见的NEAR IR SUB-FS泵脉冲。将寻求在XFELS（包括Flash，Swiss Fel，Fermi，LCLS和欧洲XFEL）的进一步的Beamtime，以扩展研究以捕获高能原子边缘处的动力学，例如O K和F K边缘。